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guzsdaily · 8 months ago

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Good Code is Boring

Daily Blogs 358 - Oct 28th, 12.024

Something I started to notice and think about, is how much most good code is kinda boring.

Clever Code

Go (or "Golang" for SEO friendliness) is my third or fourth programming language that I learned, and it is somewhat a new paradigm for me.

My first language was Java, famous for its Object-Oriented Programming (OOP) paradigms and features. I learned it for game development, which is somewhat okay with Java, and to be honest, I hardly remember how it was. However, I learned from others how much OOP can get out of control and be a nightmare with inheritance inside inheritance inside inheritance.

And then I learned JavaScript after some years... fucking god. But being honest, in the start JS was a blast, and I still think it is a good language... for the browser. If you start to go outside from the standard vanilla JavaScript, things start to be clever. In an engineering view, the ecosystem is really powerful, things such as JSX and all the frameworks that use it, the compilers for Vue and Svelte, and the whole bundling, and splitting, and transpiling of Rollup, ESBuild, Vite and using TypeScript, to compile a language to another, that will have a build process, all of this, for an interpreted language... it is a marvel of engineering, but it is just too much.

Finally, I learned Rust... which I kinda like it. I didn't really make a big project with it, just a small CLI for manipulating markdown, which was nice and when I found a good solution for converting Markdown AST to NPF it was a big hit of dopamine because it was really elegant. However, nowadays, I do feel like it is having the same problems of JavaScript. Macros are a good feature, but end up being the go-to solution when you simply can't make the code "look pretty"; or having to use a library to anything a little more complex; or having to deal with lifetimes. And if you want to do anything a little more complex "the Rust way", you will easily do head to head with a wall of skill-issues. I still love it and its complexity, and for things like compiler and transpilers it feels like a good shot.

Going Go

This year I started to learn Go (or "Golang" for SEO friendliness), and it has being kinda awesome.

Go is kinda like Python in its learning curve, and it is somewhat like C but without all the needing of handling memory and needing to create complex data structured from scratch. And I have never really loved it, but never really hated it, since it is mostly just boring and simple.

There are no macros or magic syntax. No pattern matching on types, since you can just use a switch statement. You don't have to worry a lot about packages, since the standard library will cover you up to 80% of features. If you need a package, you don't need to worry about a centralized registry to upload and the security vulnerability of a single failure point, all packages are just Git repositories that you import and that's it. And no file management, since it just uses the file system for packages and imports.

And it feels like Go pretty much made all the obvious decisions that make sense, and you mostly never question or care about them, because they don't annoy you. The syntax doesn't get into your way. And in the end you just end up comparing to other languages' features, saying to yourself "man... we could save some lines here" knowing damn well it's not worth it. It's boring.

You write code, make your feature be completed in some hours, and compile it with go build. And run the binary, and it's fast.

Going Simple

And writing Go kinda opened a new passion in programming for me.

Coming from JavaScript and Rust really made me be costumed with complexity, and going now to Go really is making me value simplicity and having the less moving parts are possible.

I am becoming more aware from installing dependencies, checking to see their dependencies, to be sure that I'm not putting 100 projects under my own. And when I need something more complex but specific, just copy-and-paste it and put the proper license and notice of it, no need to install a whole project. All other necessities I just write my own version, since most of the time it can be simpler, a learning opportunity, and a better solution for your specific problem. With Go I just need go build to build my project, and when I need JavaScript, I just fucking write it and that's it, no TypeScript (JSDoc covers 99% of the use cases for TS), just write JS for the browser, check if what you're using is supported by modern browsers, and serve them as-is.

Doing this is really opening some opportunities to learn how to implement solutions, instead of just using libraries or cumbersome language features to implement it, since I mostly read from source-code of said libraries and implement the concept myself. Not only this, but this is really making me appreciate more standards and tooling, both from languages and from ecosystem (such as web standards), since I can just follow them and have things work easily with the outside world.

The evolution

And I kinda already feel like this is making me a better developer overhaul. I knew that with an interesting experiment I made.

One of my first actual projects was, of course, a to-do app. I wrote it in Vue using Nuxt, and it was great not-gonna-lie, Nuxt and Vue are awesome frameworks and still one of my favorites, but damn well it was overkill for a to-do app. Looking back... more than 30k lines of code for this app is just too much.

And that's what I thought around the start of this year, which is why I made an experiment, creating a to-do app in just one HTML file, using AlpineJS and PicoCSS.

The file ended up having just 350 files.

Today's artists & creative things Music: Torna a casa - by Måneskin

#daily blog #scope/daily #scope/code #day/2024-10-28 #codeblr #golang #javascript #simplicity

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roseliejack123 · 2 years ago

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Mastering the Basics of Java: Your Gateway to Software Development

In the ever-evolving landscape of programming, Java stands as a versatile and widely-adopted language that has consistently been the preferred choice of developers worldwide. Whether you are a newcomer taking your first steps into the world of programming or an experienced developer seeking to broaden your skillset, acquiring a profound understanding of Java's fundamentals is an essential stride forward. In this comprehensive and meticulously crafted guide, we embark on a journey to delve deep into the core concepts of Java programming. This knowledge will not only serve as a strong foundation but also empower you to navigate the dynamic and ever-evolving domain of software development with confidence.

Java's popularity has endured for decades, and it shows no signs of slowing down. Its ability to adapt to the ever-shifting demands of the software industry, coupled with its cross-platform compatibility, has made it a mainstay for both beginners and seasoned professionals. Whether you aspire to develop web applications, mobile apps, or enterprise-grade software solutions, Java offers a versatile platform to turn your coding dreams into reality.

1. Syntax: The Building Blocks of Java

Java's syntax is often praised for its readability and similarity to other programming languages like C++ and C#. This makes it relatively easy to learn, especially if you have experience with these languages. The key feature of Java's syntax is the use of curly braces {} to define blocks of code. These braces play a fundamental role in structuring Java programs, making it essential to grasp their usage.

2. Objects and Classes: Embracing Object-Oriented Programming (OOP)

Java is an object-oriented programming (OOP) language, which means it revolves around the concepts of objects and classes. In Java, everything is treated as an object, and classes serve as blueprints for creating these objects. A class defines both the properties (fields) and behaviors (methods) of an object. Understanding the principles of OOP is vital for building well-structured and modular Java applications.

3. Data Types: The Foundation of Variables and Data Manipulation

Java supports a variety of data types, categorized into primitive data types (e.g., int, double, char) and reference data types (e.g., objects, arrays). Primitive data types represent basic values, while reference data types refer to objects created from classes. Grasping these data types is essential for declaring variables and manipulating data in your Java programs.

4. Control Flow: Directing the Flow of Your Program

Java provides an array of control flow statements that dictate the execution flow of your program. These include conditional statements (such as if-else and switch), looping statements (including for, while, and do-while), and branching statements (like break, continue, and return). Mastery of these control flow structures is crucial for creating efficient and logic-driven Java applications.

5. Inheritance: Building on Existing Foundations

Inheritance is a core concept in Java that enables you to create new classes based on existing ones. By inheriting the properties and behaviors of a parent class, you can promote code reusability and establish a more organized code structure. Inheritance is a powerful tool for designing extensible and scalable Java applications.

6. Polymorphism: Achieving Flexibility and Extensibility

Polymorphism is another hallmark of Java's object-oriented approach. It enables objects of various classes to be handled as though they were members of a single superclass. This flexibility in code design allows you to create more versatile and extensible applications. Understanding polymorphism is essential for leveraging the full potential of Java's object-oriented capabilities.

7. Exception Handling: Managing Errors Gracefully

Java boasts a robust exception-handling mechanism to deal with runtime errors. By using try-catch blocks, you can gracefully handle exceptions, ensuring that your program doesn't crash unexpectedly. Effective exception handling is a key aspect of writing robust and reliable Java code.

8. Packages and Libraries: Harnessing the Power of Java's Ecosystem

Java offers a vast standard library known as the Java Standard Library or Java API. Additionally, it allows you to organize your code into packages for better organization and modularity. Leveraging these packages and libraries is essential for streamlining your development process and tapping into a wealth of pre-built functionality.

9. Memory Management: The Art of Garbage Collection

Java employs a unique feature called garbage collection to automatically manage memory. This process helps prevent memory leaks and ensures efficient memory usage in your Java applications. Understanding how garbage collection works is crucial for maintaining the performance and stability of your programs.

10. Multithreading: Building Responsive and Scalable Applications

Java's support for multithreading allows you to execute multiple threads concurrently. Threads are smaller units of a process that can run independently, making it possible to build responsive and scalable applications. Mastering multithreading is essential for developing high-performance Java software, particularly in today's world of parallel computing.

Learning Java opens doors to a wide range of career opportunities in software development and information technology. Whether you're interested in building web applications, mobile apps, or enterprise solutions, Java's versatility makes it a valuable skill.

If you're looking to embark on your Java programming journey or enhance your existing skills, consider exploring courses and training programs offered by reputable institutions like ACTE Technologies. They provide comprehensive learning experiences and expert guidance to help you master Java and advance your career in this exciting field.

In conclusion, Java's robust features and wide-ranging applications make it a compelling choice for developers worldwide. By mastering its fundamental concepts and continuously expanding your knowledge, you'll be well-prepared to tackle complex projects and contribute to the ever-evolving world of software development. Good luck with your Java programming efforts!

#java training #java course #training #technology

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online-training-usa · 1 year ago

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Understanding Object-Oriented Programming and OOPs Concepts in Java

Object-oriented programming (OOP) is a paradigm that has revolutionized software development by organizing code around the concept of objects. Java, a widely used programming language, embraces the principles of OOP to provide a robust and flexible platform for developing scalable and maintainable applications. In this article, we will delve into the fundamental concepts of Object-Oriented Programming and explore how they are implemented in Java.

Object-Oriented Programming:

At its core, Object-Oriented Programming is centered on the idea of encapsulating data and behavior into objects. An object is a self-contained unit that represents a real-world entity, combining data and the operations that can be performed on that data. This approach enhances code modularity, and reusability, and makes it easier to understand and maintain.

Four Pillars of Object-Oriented Programming:

Encapsulation: Encapsulation involves bundling data (attributes) and methods (functions) that operate on the data within a single unit, i.e., an object. This encapsulation shields the internal implementation details from the outside world, promoting information hiding and reducing complexity.

Abstraction: Abstraction is the process of simplifying complex systems by modeling classes based on essential properties. In Java, abstraction is achieved through abstract classes and interfaces. Abstract classes define common characteristics for a group of related classes, while interfaces declare a set of methods that must be implemented by the classes that implement the interface.

Inheritance: Inheritance is a mechanism that allows a new class (subclass or derived class) to inherit properties and behaviors of an existing class (superclass or base class). This promotes code reuse and establishes a hierarchy, facilitating the creation of specialized classes while maintaining a common base.

Polymorphism: Polymorphism allows objects of different types to be treated as objects of a common type. This is achieved through method overloading and method overriding. Method overloading involves defining multiple methods with the same name but different parameters within a class, while method overriding allows a subclass to provide a specific implementation of a method that is already defined in its superclass.

Java Implementation of OOP Concepts:

Classes and Objects: In Java, a class is a blueprint for creating objects. It defines the attributes and methods that the objects of the class will have. Objects are instances of classes, and each object has its own set of attributes and methods. Classes in Java encapsulate data and behavior, fostering the principles of encapsulation and abstraction.

Abstraction in Java: Abstraction in Java is achieved through abstract classes and interfaces. Abstract classes can have abstract methods (methods without a body) that must be implemented by their subclasses. Interfaces declare a set of methods that must be implemented by any class that implements the interface, promoting a higher level of abstraction.

Inheritance in Java: Java supports single and multiple inheritances through classes and interfaces. Subclasses in Java can inherit attributes and methods from a superclass using the extends keyword for classes and the implements keyword for interfaces. Inheritance enhances code reuse and allows the creation of specialized classes while maintaining a common base.

Polymorphism in Java: Polymorphism in Java is manifested through method overloading and overriding. Method overloading allows a class to define multiple methods with the same name but different parameters. Method overriding occurs when a subclass provides a specific implementation for a method that is already defined in its superclass. This enables the use of a common interface for different types of objects.

Final Thoughts:

Object-oriented programming and its concepts form the foundation of modern software development. Java, with its robust support for OOP, empowers developers to create scalable, modular, and maintainable applications. Understanding the principles of encapsulation, abstraction, inheritance, and polymorphism is crucial for harnessing the full potential of OOPs concepts in Java. As you continue your journey in software development, a solid grasp of these concepts will be invaluable in designing efficient and effective solutions.

#javascript #javaprogramming #java online training #oops concepts in java #object oriented programming #education #technology #study blog #software #it #object oriented ontology #java course

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seobestpeers · 3 days ago

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Java in Action — Top 3 Use Cases

Software development is a dynamic industry that evolves promptly to deliver the best tech to businesses. The introduction of programming languages brought a significant change in the industry. This is because it allowed businesses to bring them online with the help of the internet.

One of the programming languages that was introduced is Java.

In the mid-1990s, Java’s inception took place, and since then, it has been a preferred choice of developers and businesses. Research shows that in 2024, Java ranked as the third most used programming language after Python and JavaScript.

Java is a highly adaptable language, ideal for developing scalable enterprise software and performance-driven mobile applications. This is because it is a flexible, reliable, and secure language.

In this blog, we’ll explore the top 3 Java use cases that highlight the language’s practical power in real-world scenarios. Let’s dive in!

Why Java?

There are certain reasons why Java is preferred to date, apart from its versatility. Let’s discuss them briefly:

1. Object-Oriented Programming (OOP): Java is based on OOP principles, which include concepts such as classes, objects, inheritance, encapsulation, and polymorphism. These principles facilitate the creation of code that is structured, reusable, and maintainable over time.

2. Platform Independence: Java follows the “write once, run anywhere” philosophy, allowing code to be compiled into bytecode. Once compiled into bytecode, Java programs are executed by the Java Virtual Machine (JVM), ensuring platform independence across systems like Windows, Linux, and macOS.

3. Simplicity: Java offers a simpler learning curve compared to C or C++, making it a popular choice for beginners. It avoids complex features like pointers and multiple inheritance, which enhances code readability and maintainability.

4. Robustness: Java’s built-in features, including automatic memory management, structured exception handling, and rigorous type checking, make it a trusted choice for enterprise software development.

5. Security: Java offers enhanced security through its bytecode verification, security manager, and lack of direct pointer access. This reduces the risk of memory or data corruption by malicious code.

6. High Performance: Java achieves high performance through its bytecode, JVM optimizations, and built-in features like garbage collection.

7. Multithreading: Java supports multithreading, allowing multiple tasks to run concurrently within a single program, which improves efficiency and responsiveness.

8. Distributed Computing: Java’s networking capabilities and support for distributed computing make it well-suited for building applications that operate across multiple computers on a network.

9. Dynamic: Java is considered a dynamic language because it supports features like dynamic proxies and reflection, allowing for flexible and adaptable code.

10. Interpreted: Java is an interpreted language, meaning the code is compiled into bytecode, which the JVM interprets at runtime. This enables Java code to run seamlessly across different platforms without modification.

11. Architecture-Neutral: Java’s architecture-neutral design enables it to run unmodified on any hardware and operating system.

Now that you know the features of Java, let’s discuss some of its use cases.

Top 3 Use Cases of Java

Here you will learn the use of Java in enterprise applications, Android applications, big data, and distributed systems. Let’s dive in.

Enterprise Application Development

Java stands as a dominant technology for building scalable, secure enterprise solutions. Whether it is a financial institution or a healthcare provider, Java is the cornerstone of numerous enterprise-critical systems.

Why Enterprises Choose Java?

Java’s power lies in its scalability, dependability, and comprehensive frameworks like Jakarta EE and Spring.

These tools empower developers to build modular, maintainable, and high-performance business applications.

Key Features of Java for Enterprises

Here are some features of Java that benefit enterprises:

JVM-based Scalability

Java’s robust architecture enables exceptional scalability, allowing applications to handle millions of transactions seamlessly. This is crucial for enterprises needing reliability and performance during peak loads.

Spring Boot and Spring Cloud

Spring Boot and Spring Cloud enable the creation of flexible and efficient microservices, promoting modular design and rapid deployment for easy application maintenance.

Comprehensive Security APIs

Java provides essential security APIs and enterprise-grade authentication tools to protect sensitive data and guard against threats, making security a top priority for enterprises.

Seamless Database Integration

JDBC, Hibernate, and JPA enable Java to efficiently connect with databases, allowing enterprises to dynamically manage data and perform complex queries for data-driven applications.

Real-World Examples

Banking Sector: Global banks like HSBC and Citibank use Java to power secure backend operations, fraud detection systems, and online transaction platforms.

Healthcare: Java is used for managing patient data, scheduling, and claims processing in HIPAA-compliant applications.

Retail and ERP: Java helps power large-scale inventory systems, logistics management, and customer service platforms.

Android Application Development

Java has held its ground in Android development despite the rise of Kotlin. Java has been the original language of Android app development, and thus it continues to facilitate numerous mobile applications globally.

Why Java for Android?

Here are some reasons why Java is used for Android:

Vast legacy codebases and rich libraries developed in Java underpin many critical systems.

Android SDK is largely Java-based.

Strong IDE support (e.g., Android Studio).

While Kotlin offers a modern syntax, Java is still the go-to for many developers, especially those new to mobile app development or maintaining existing apps.

Features of Java for Android

Memory Management: Java’s garbage collection helps maintain a smooth performance.

Exception Handling: Enhances error management to prevent application crashes.

Multithreading: It is essential for background tasks such as downloading files or syncing data.

Popular Java-Based Android Apps

Twitter (legacy versions): Java-powered backend and UI rendering.

Spotify: Music streaming giant used Java extensively during its Android development journey.

Big Data and Distributed Systems

Java plays a vital role in big data and distributed computing due to its performance, portability, and multithreading abilities. It acts as a keystone for many tools in the Big Data ecosystem.

Why Java in Big Data?

Many of the widely used big data libraries, like Apache Hadoop, Apache Spark, and Apache Kafka, are either written in Java or utilise Java APIs. This is because Java’s efficient memory handling and thread management make it suitable for processing huge data sets.

Features of Java for Big Data Systems

Concurrency support for handling parallel data streams.

Seamlessly integrates with big data technologies and NoSQL databases like Cassandra, HBase, and MongoDB.

Platform-independent for easy deployment in cloud-native environments.

Real-World Applications

Netflix: Uses Java for its real-time data ingestion and processing pipeline with Kafka and Apache Flink.

LinkedIn: Heavily relies on Java for handling billions of data events daily.

Telecom: Real-time call analysis and network monitoring platforms are often built using Java.

Conclusion

Java is the leading choice in modern development, from enterprise platforms to mobile apps and big data pipelines. Its ability to meet business and developer needs stems from its popularity. Moreover, it offers features like platform independence, security, scalability, and extensive libraries. Thus, whether required by a developer or a business, Java is a smart and future-ready programming language.

If you want to bring this versatile programming language to your business’s tech stack, contact IT companies like BestPeers. They will help you create seamless and functional web applications that are secure and scalable using Java.

#custom software development #java #javascript #hire developers #software development

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habibicoding · 22 days ago

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Why Ubuntu is the Perfect Gateway into the Linux World

Linux can feel like a daunting frontier for newcomers. Its reputation for complexity and command-line wizardry often scares off those curious about open-source operating systems. But there’s a friendly entry point that makes the transition smooth and welcoming: Ubuntu. Known for its accessibility and robust community, Ubuntu is the perfect gateway into the Linux world.

This article explores why Ubuntu stands out as the ideal starting point for anyone looking to dive into Linux, covering its user-friendly design, vast software ecosystem, strong community support, and versatility across devices.

A User-Friendly Design That Eases the Learning Curve

Stepping into Linux can feel like learning a new language, but Ubuntu makes it as approachable as a casual conversation. This is why Ubuntu is the perfect gateway into the Linux world: it prioritizes simplicity over complexity. Unlike some Linux distributions that demand technical know-how from the get-go, Ubuntu’s graphical interface, known as GNOME by default, feels familiar to anyone who’s used Windows or macOS. The desktop is clean, intuitive, and packed with thoughtful touches, like a dock for quick app access and a search bar that finds files or settings in seconds.

New users don’t need to wrestle with the terminal to get started. Installing Ubuntu is straightforward, with a guided setup that walks you through partitioning drives and configuring settings. Once installed, the system feels polished and responsive. You can tweak wallpapers, arrange icons, or adjust settings without diving into config files. For those nervous about leaving their comfort zone, Ubuntu’s design bridges the gap between proprietary systems and the Linux world, reinforcing why Ubuntu is the perfect gateway into the Linux world.

It’s not just about looks. Ubuntu’s default apps, like Firefox for browsing, LibreOffice for productivity, and Rhythmbox for music, are pre-installed and ready to go. This means you can hit the ground running without needing to hunt for software. For anyone worried about Linux being “too technical,” Ubuntu proves you can explore open-source without a steep learning curve.

A Vast Software Ecosystem at Your Fingertips

One of Ubuntu’s biggest strengths is its access to a massive library of software, making it a playground for both beginners and seasoned users. The Ubuntu Software Center is a one-stop shop where you can browse, install, and update thousands of applications with a single click. Whether you need a video editor, a code editor, or a game to unwind, Ubuntu has you covered.

Here’s why the software ecosystem makes Ubuntu the perfect gateway into the Linux world:

Snap and Flatpak Support: Ubuntu embraces modern packaging formats like Snap and Flatpak, ensuring you get the latest versions of apps like Slack, Spotify, or VS Code. These formats simplify installation and updates, even for proprietary software.

Debian Roots: Built on Debian, Ubuntu inherits a vast repository of packages accessible via the APT package manager. This gives users access to a wide range of tools, from server software to niche utilities.

Cross-Platform Compatibility: Many apps available on Ubuntu have versions for Windows or macOS, making the switch less jarring. For example, GIMP (a Photoshop alternative) or Blender (for 3D modeling) work similarly across platforms.

This ecosystem empowers users to experiment without feeling overwhelmed. Want to try coding? Install Python or Java with a single command. Need a creative suite? Grab Krita or Inkscape from the Software Center. Ubuntu’s software availability ensures you can tailor your system to your needs, whether you’re a student, developer, or casual user.

A Supportive Community That Has Your Back

Linux can seem intimidating when you hit a snag, but Ubuntu’s community makes troubleshooting feel like a group effort. With millions of users worldwide, Ubuntu boasts one of the largest and most active communities in the Linux world. Whether you’re stuck on a driver issue or curious about customizing your desktop, help is never far away.

The community shines through in several ways:

Forums and Q&A Sites: The Ubuntu Forums and Ask Ubuntu (part of Stack Exchange) are treasure troves of advice. Search for your issue, and chances are someone’s already solved it. If not, post a question, and friendly users will chime in.

Tutorials and Documentation: Ubuntu’s official documentation is clear and beginner-friendly, covering everything from installation to advanced tweaks. Countless blogs and YouTube channels also offer step-by-step guides tailored to new users.

Local User Groups: Many cities have Ubuntu or Linux user groups where enthusiasts meet to share tips and troubleshoot together. These groups make the Linux world feel less like a solo journey and more like a shared adventure.

This support network is a game-changer for newcomers. Instead of feeling lost in a sea of terminal commands, you’re backed by a global community eager to help. It’s like having a knowledgeable friend on speed dial, ready to guide you through any hiccup.

Versatility Across Devices and Use Cases

Ubuntu’s flexibility is another reason it’s the perfect gateway into the Linux world. Whether you’re reviving an old laptop, setting up a home server, or building a developer workstation, Ubuntu adapts to your needs. It runs on everything from low-spec netbooks to high-end workstations, making it a go-to choice for diverse hardware.

For casual users, Ubuntu’s lightweight editions, like Xubuntu or Lubuntu, breathe new life into aging machines. These variants use less resource-hungry desktops while retaining Ubuntu’s core features. Developers love Ubuntu for its robust tools, such as Docker, Kubernetes, and Git, preconfigured for coding environments. Even gamers are finding Ubuntu increasingly viable, thanks to Steam’s Proton and Wine for running Windows games.

Beyond desktops, Ubuntu powers servers, cloud infrastructure, and even IoT devices. Companies like Canonical (Ubuntu’s developer) ensure regular updates and long-term support (LTS) releases, which are stable for five years. This versatility means you can start with Ubuntu on a personal laptop and later explore its server or cloud capabilities without switching distributions.

The ability to customize Ubuntu is a bonus. Want a macOS-like look? Install a theme. Prefer a Windows vibe? Tweak the layout. This adaptability lets users experiment with Linux’s possibilities while staying in a familiar environment. Ubuntu’s balance of stability and flexibility makes it a launching pad for exploring the broader Linux ecosystem.

Conclusion

Ubuntu stands out as the ideal entry point for anyone curious about Linux. Its user-friendly design welcomes beginners with a familiar interface and straightforward setup. The vast software ecosystem ensures you have the tools you need, from creative apps to developer suites.

A supportive community is there to guide you through challenges, making the Linux world feel less intimidating. And with its versatility across devices and use cases, Ubuntu grows with you as your skills and needs evolve. For anyone looking to dip their toes into open-source waters, Ubuntu is the perfect gateway into the Linux world, a friendly, flexible, and powerful starting point for an exciting journey.

#WhyUbuntuisthePerfectGatewayintotheLinuxWorld #CommonLinuxMythsBusted:WhatNewUsersShouldReallyExpect

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scientecheasy · 2 months ago

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Learn Inheritance in Java – Scientech Easy

Master the concept of Inheritance in Java with step-by-step tutorials on Scientech Easy. Understand how Java classes inherit methods and fields, and explore types like single, multilevel, and hierarchical inheritance. Perfect for beginners and advanced learners alike!

#bca course subjects #Interface in Java #Python tuple #Exception handling in Java #collection framework in java #constructor in java #Polymorphism in Java

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jiejing-lifechanyuan · 3 months ago

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The Origin of Humanity

Xuefeng

(Translated by Conglong)

Where do human beings come from?

There have been some sayings:

Pangu created the heaven and earth, Nuwa created men using clay.（In Chinese mythology, Pangu and??Nuwa are the god and goddess who created the world）

Prometheus made men out of mud and stole fire from heaven for humans.

Ram-headed god Khnum moulded men from clay at a potter’s wheel, and goddess Heqet breathed life??into the new body, and they two together made new lives.

God created man using clay according his own image.

Celestials came to the earth.

Human beings were created by aliens

Humans were evolved gradually from single-cell organisms.....

However, the most influential sayings are evolutionism and the story of how God created man in Bible.

1. The Awkwardness of Evolutionism

According to the theory of Evolution, humans were evolved from apes, and apes could possibly be evolved from rabbits, and rabbis from worms. Worms could be evolved from microbes; microbes from single-cell organisms, which could possibly come into being by accidence in the sea, the vast “organic and fertile soup”.

Evolution is the result of inheritance, mutation and natural selection.

Evolution is a slow and gradual process.

Evolution is in accordance with the “natural selection, the law of jungle and survival of the fittest.”

But is this really the truth?

The process of one organism evolves to another organism is a very long process. A rabbit can’t evolve to a monkey overnight. One seed, from germination, growth, flowering, fruiting to decline, there is a process. Any step of process could not be skipped. If we take picture of the seed every day, we will be able to see the slow and gradual process of its change. Evolutionism firmly believes that humans are evolved from apes. There must be a slowly changing process and some “intermediates”, that is to say, from an ape to a man, it should at least have some steps of intermediates, it is impossible that an ape will leap to a man, so where are those intermediates? What are they?

In 1924, “scientists” found fossils which they called “Australopithecus africanus” (Southern ape of Africa) near the famous diamond town, Kimberley, South Africa, later, they found more, “Australopithecus boisei” (it is also called “Eastern African”), “Australopithecus afrensis”, “Australopithecus garhi etc.??Particularly, they think “Java Man” was the “intermediate” between ape and human. Based on these facts, evolutionists self-deceivingly claimed that they had made “great achievements”.

But please don’t be too satisfied; self-entertaining will not bring joys to others.

According to the calculation based on molecular biology, it was between four and five million years ago when men and apes separated, so from four million years ago till the time of earliest historical records, how human beings evolved? Were there no any processes or intermediates? If not, does that mean evolution stopped at the stage? If yes, please show the evidence.

Again, I want to ask evolutionists, which animal were apes evolved from? Can you please give us evidences too?

How can you prove that the four million years old fossils you found are the ancestors of humanity? Just because their shapes look alike? Can you prove that chicken is the ancestor of swan because you found a few chicken bones?

At the end of the twentieth century, a large number of fossils were discovered in Chengjiang County, Yunnan Province, China.??The research showed that today’s diverse animals were actually appearing suddenly on the earth, and it also proved the correctness of theory of “Cambrian Explosion”, which??happened 530 million years ago.

The theory of “Cambrian Explosion” says that over 90% of animal species were appearing suddenly in a “moment” which is less than one percent time of the earth developing history. It is like mushrooms growing everywhere along ditches and grasslands after an overnight drizzle, which is by no means a slow and gradual process, so do evolutionists still have any far-fetched explanations on this?

Let me ask more: the obtuse angle of three congruent rhomb at the bottom of a beehive is 109°28', and the acute angle is 70°32', which is the most economic and reasonable structure, so is this “wisdom” also from evolution? Rooster crowing, chick breaking its egg shell, bird migrating, spider webbing, eel discharging, chameleons changing skin colour, weaver bird nestling, silkworm making cocoon, snail making shell, hound tracking, pigeon going home etc.. Do all these wisdom of animals and insects come from evolution?

Let’s make the conclusion by quoting the wisdom of Darwin, the originator of the theory of evolution, "If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down".

The birth of Lifechanyuan has proved evolution theory has “absolutely broken down”

Evolutionism cannot prove the origin of humanity.

Human beings were not evolved from animals at all.

2. the Awkwardness of Bible

There were records about the origin of humanity in the “Genesis” of Bible:

1:26 And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.

1:27 So God created man in his own image, in the image of God created he him; male and female created he them.

1:28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth.

1:29 And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat.

1:30 And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so.

1:31 And God saw every thing that he had made, and, behold, it was very good. And the evening and the morning were the sixth day.

2.7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.

2.18 And the LORD God said, It is not good that the man should be alone; I will make him an help meet for him.

2.21 And the LORD God caused a deep sleep to fall upon Adam, and he slept: and he took one of his ribs, and closed up the flesh instead thereof

2:22 And the rib, which the LORD God had taken from man, made he a woman, and brought her unto the man.

3:20 And Adam called his wife's name Eve; because she was the mother of all living.

So is this how humans come into being?

Let’s still have a look of what Bible says:

4:1 And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the LORD.

4:2 And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground.

4:3 And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto the LORD.

4:4 And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering:

4:5 But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell.

4:6 And the LORD said unto Cain, Why art thou wroth? and why is thy countenance fallen?

4:7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.

4:8 And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.

4:9 And the LORD said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?

4:10 And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.

4:11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;

4:12 When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth.

4:13 And Cain said unto the LORD, My punishment is greater than I can bear.

4:14 Behold, thou hast driven me out this day from the face of the earth; and from thy face shall I be hid; and I shall be a fugitive and a vagabond in the earth; and it shall come to pass, that every one that findeth me shall slay me.

4:15 And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.

4:16 And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.

So, we have a question on the above records, Adam and Eve are the ancestors of humans, Cain and Abel are the first two sons of Adam and Eve, at that time, there should not be anybody else exist on the earth except Adam’s family, so why Cain was worrying “every one that findeth me shall slay me”? Who were going to find him?

If what Bible recorded is true, there must be some other men exist except Adam’s family, and they must had long existed before Adam’s family. Otherwise, Cain would not say, “every one that findeth me shall slay me”. So if there lived other humans, and they were not descendants of Adam and Eve (back then, Adam and Eve only had two son, and Abel was killed by Cain), we can say Adam and Even are not the ancestors of all human beings, and what Bible recorded is only the story of origin of Israelite people.

Bible only recorded the origin of the Middle East people, and not that of all human beings.

So where do human beings come from?

3. the Prelude

We have known how the universe and the Greatest Creator came into being, I have proven the existence of the Greatest Creator in the chapters of “the Greatest Creator” using forty natural phenomena and eight logical reasonings; but what did the Greatest Creator do after his birth?

“Wuji” generates “Taiji”, Taiji generates two complementary forces. These two forces are unity of opposites. That is to say, after Taiji, the Creator, was born, division of energy started to happen within Wuji; where the energy is low, it comes into forms, therefore, the celestial bodies of universe began to emerge one by one, space started to expand infinitely. Where the energy is high, things exist with no form, just like the “black holes” in the universe, they are invisible.

When some celestial bodies first appeared, their movement were random and disordered; there were no solar system, Milky Way system, nor Law-Rotary Galaxy system and Rotary-River Galaxy System. To ensure everything run in order, the Greatest Creator needs “someone” to take care of the universe. It is like a person borrowed a large sum of money from bank in order to establish a big business, he need to recruit some people to take the responsibilities of purchasing, manufacturing, production, internal management and sales etc. Same, the Greatest Creator also need “someone” to help him finish the project of “creating the universe”.

Then how did he manage the universe? He started to make Gods, what is god? God is the helper of the Greatest Creator. Then how did the Greatest Creator make god?

We know that the Greatest Creator is the energy core and nerve center of the universe. He used his almighty consciousness generating powerful energy to squeeze some regional energy, which then became many independent energy groups.The centre of these groups formed a special structure; after the structure was strengthened with the power of the energy, a consciousness was born, these consciousness entities are gods.

The process is similar as making bricks in kilns. We use loosened soil, added with appropriate chemicals, put them into kilns to calcine. After this process, the loosened soil become hard bricks. If we put the soil and chemicals in a vessel that can’t be destroyed by any powerful energy, and then calcine them using very high energy, the soil mixed with chemicals will form a special structure, and will further produce consciousness - a new life will be born.

How many gods has the Greatest Creator made? Many!

Each god has his own independent consciousness, but their energy level is far lower than that of the Greatest Creator. Therefore, gods have to obey the Greatest Creator.

What is the energy level of a god? It depends on the size of the energy ball used to create that particular god. Some gods have very high energy, some have very small energy.??However, even the god with the smallest energy is more powerful than any one of the visible celestial bodies. The energy of sun is very high, but the total energy of the sun is less than that of the least powerful god. The “black holes” all over the universe we know are actually gods.

When the Greatest Creator finished making gods, he ordered them to form universes, for example, the universe where the earth lives is in charged by many gods (black holes). Among them, the two biggest gods are Jesus and Satan, that is to say, earth universe are managed by Jesus and Satan. (Earth universe includes 3000 Rotary-River Systems, 9,000,000 milky way systems, 27 billions of solar system)

Jesus and Satan are two opposite gods, but they are unity. Jesus stands for the sincere, kind and beautiful; Satan stands for the false, evil and ugly. Jesus stands for light, Satan stands for dark; Jesus stands for the ordinary, Satan stands for the extraordinary; Jesus stands for the weak, Satan stands for the strong.

When gods were created, the universe was still not vibrant enough, it was quiet and deserted, and gods felt bored and lonely. Therefore, they asked the Greatest Creator to create more lives to make the universe noisy and vital. He agreed and then created many new lives using smaller energy balls; these new lives are the angels which are so called in Judaism, Christianity,Catholicism, and Islam.

Angels are the lives whose energy level is lower than gods, and they are managed and dominated by god. They are also the messengers and helpers of god; they assist gods to manage everything in their own universe. Angels have their own characters, they can move freely in any time and space.

The appearance of angels made the universe very lively and vibrant, the universe can be described as “orioles sing and swallows dart, bustling with noise and excitement”. But the problem after that is because Jesus and Satan stand for two opposite sides, they are evenly matched but have contrasting views, which eventually led angels divide into two parties. One follows the viewpointof Jesus, the other follows Satan; the former is just the “Buddha” we always know from Buddhism, the latter is the “Celestial” described in Chinese Taoism.

“Buddha” is angle. In Chinese word, Buddha is 佛. 弗stands for not, 亻stands for human. So Buddha means a “human” who is not human. They actually have supernatural power and are able to appear in any forms; they can create life, move mountains and turn over the sea. They can change the visible to invisible, the invisible to visible. They can survive in a vacuum, and move freely in many spaces without the constraints of time.??The “headquarter”of Buddha is what we call paradise, which is also the “Elysium” I mentioned in 36 dimensional spaces.

“Celestial” is also angel. From the structure of Chinese word “仙”, we can reason that they are a group of “human” who like to travel around, enjoy nature, and love fun. They have the same level of power and ability as what Buddha have, however, although Buddha look peaceful, they are arrogant and always want to excel over others while Celestials are gentle, pure, fun-loving, behaving the same as what they look like.

4. Super Celestials Creating Human

In order to demonstrate its power,under the permission of the Greatest Creator, 4.5 billion years ago, Jesus led hundreds of millions celestials start the “project” of creating solar system. They first created the earth,then the sun and other planets in the solar system. They made very careful calculation and design on the size, position, rotary speed of the sun and the earth. After that, Jesus sent near one hundred million celestials come to the earth with the identity of intelligent beings, they started large scale of creation on the earth; the water, air, and most green vegetation and grazing animals are the creations of those celestials, microbes were self-created as the result of water and photosynthesis. This process, from beginning to the end, lasted for nearly 2.3 billion years.

Before animals were created, there was no moon. When the first group of animals were created, celestials found that if they left earth, animals could not survive without ebb and flow, wind,cloud, rain and snow. Therefore, they built two big smelters at places not far from where is now Cairo, Egypt and the Atlantis (it is now located at the bottom of the Atlantic ocean), and made many airships (UFO) using the special smelted metals. And sent the animals they created to everywhere on the earth. At the mean time, they used these airships to transport smelted metals to a “space station”.??They then created a huge hollow ball with a rough surface, silver and reflecting. This huge ball is the moon we refer to today. One billion years ago, the night on the earth was very bright. Later, because the dust from universe continuously dropped on the moon,it was no longer as bright as before.

The UFOs we occasionally saw are not from outer space, they are from the center of the moon, which is a huge warehouse. It stores many “tools” which had been used by celestials; UFO is also one of the “tools”. There is a door on the moon; it can be opened at anytime. There is a giant “palace” under the mysterious Bermuda Triangle; that is the temporary “lodge” for the visiting celestials. Celestials can remotely control UFOs in the warehouse of the moon to monitor the earth according to their needs.

The earth of two hundred millions years ago was very beautiful and prosperous. The place where Sahara Desert currently is located had many green mountains and a dense growth of green trees, birds were twittering, flowers were blossoming, it was once the most beautiful places for green plants and animals. Celestials used to love singing, dancing and playing on the earth, and they were so enjoying it and almost forgot their home.

Unfortunately, the happy scene didn’t last long. The happiness of celestials provoked the anger of Satan. In order to show that he had superior power, he sent another group of Buddhas to the earth two hundred and fifty million years ago, and started to create flies, mosquitoes, bugs, rats, scorpions, centipedes, snakes and predators in large scale to let these animals fight with the creations of celestials. Moreover, they even appeared in the form of dinosaur, destroyed the plants and animals all over the world out of jealousy.

This inharmonious situation made the Greatest Creator very sad.??At about one hundred and thirty million years ago, he destroyed all dinosaurs by applying one kind of plague, and put all their souls in the prison of “The Cathode Black Hole”.??Unfortunately, there were a pair of smart dinosaur hid under the bottom of East China Sea and were able to survive, they kept dormant under water for nearly one hundred million years.

In about 1,600,000 years ago, in order not to let the earth become idle, the Greatest Creator designed a life structure himself, which is the draft version of current humans. He then gave the “design paper” to Jesus and let him to implement. The helpers of Jesus, celestials, started to make new lives according to this design. In order to receive the energy of the Greatest Creator sending from the universe, also to accumulate energy for creating this special new life and speed up the process, they built many laboratories in the place where now is Egypt. These “laboratories” are exactly the well-known pyramids of Egypt. Because of the lack of experience and some steps were missed, the first lives they made were monkeys, and then after were apes, of course, this wouldn’t please the Greatest Creator, so they continued testing and making. The first group of human they successfully made are the black men in Africa, and the second group are native Indians in America, the third are the white men in Europe, Egypt and North Africa. When they finished producing three groups of human, they started to evacuate, and in order to avoid Satan creating difficulties again, they destroyed everything around the Pyramids before they left, which is also why Sahara is a desert today.

But, where do most people in Middle East come from except Egyptian?

They are the descendants of Adam and Eve as what says in Bible, they were created by another god. This god knew that his “rival” started to create humans on earth. He created a secret garden of “Eden” in about 7,000 years ago at Jerusalem, and made Adam and Eve, after they were created, he destroyed the“Eden” to avoid the attention of his “rival”.

This is why Cain was afraid that “everyone that findeth me shall slay me”. Who was he afraid of? The humans created by another god.

This is why his god still protected him even Cain killed his brother. (whosoever slayeth Cain, vengeance shall be taken on him sevenfold)

So today’s conflicts between Israelite and Palestinian are actually the conflicts between brothers and are family affairs.

And let’s now talk about East Asian and Southeast Asian, they were not created by any god at all, they were the embodiments of dinosaur. At about 7500 years ago, when the pair of dinosaur knew that celestials created human on the earth, they sneaked from the sea, and changed into human form, started to propagate along the Yellow River, and the descendants gradually spread all over Asia. One of the groups went upwards, crossed the Pamirs to India; they want to mingle with the descendants of Adam and Eve to avoid the punishment of the Greatest Creator again.

This is why Chinese people always say, “China is the hometown of dragon, and Chinese are the descendants of dragon.”

This is also why Buddhism originated from India, but blossomed in East Asia and Southeast Asia.??Why it didn’t become popular in India?

The ancestors of Sakyamuniwent to India from Yellow River, when they arrived at India, they found that their consciousness was not compatible with that of the descendants of Adam and Eve, and had to find new home. Because in their subconsciousness, there’s a very deep call, that is to “go home”, which home? The “Elysium” before they came to earth.

Sakyamuni found he came from Elysium after his enlightenment. Although he had a blurry picture of his home, he still remembered something. Once this subconsciouness was awaken, he decided to be engaged in the cause of preaching to other descendants; and shifted the focus to the East led by of his subconsciousness. That’s also why Bodhidharma came to China to preach Buddhism.

Because Indian people were designed by a different creator, they were reluctant to accept the theory of Buddhism because of the absence of the memory in their subconsciousness.??That’s also why although Buddhists had made great efforts, it still failed in India. However, in East and Southeast Asia, people had the instinct sense of the existence of other dimensional spaces, it is quite easy for them to resonate with the theory of Buddhism. Once they accept it, it is rooted and lingers in their mind.

The state “vague and intangible”which Taoism pursues and the “Elysium world” Buddhism pursues are something rooted in the subconsciousness of the yellow race, they feel and believe the existence of the space that is hard to explain. In fact, the space where the ellow race yearning for is the place where the dinosaur had lived in “Ten-thousandyear world” and “Elysium world”. Therefore, even after ten million years, the message is still embedded in the genetic structure of the yellow men.

East and Southeast Asian tend to cultivate “Buhhda” and “Celestial”, it is driven by their inner voice. Although some people accept the theory of Bible, it is not an acceptance out of their heart, but a rational act. People of other races are very easy to believe in God, but quite reluctant to accept Buddhism and Taoism, some people might believe in Buddhism and Taoism, but it is just a blind pursuit of mysterious phenomena, they are impossible to reach the state of “resonance of soul”.

Then, what is the truth of the Great Flood in Noah’s time?

First, I want to explain something: before the Great Flood, human beings had been through extinction already. The humans created 16,000,000 years ago were very strong and tall,they were cruel and very aggressive, they maltreated animals and were very greedy, they didn’t even respect the Greatest Creator, not to mention gods and buddhas.??The city of Maya, ancient Egypt and Atlantis were their activity centers. They had the power of god, buhhda and celestial but were lack of their virtue, they always went to “Ten-thousand year world” and “Elysium world” to make troubles, and did whatever they wanted to do, which had become a big threat to the order of the universe. Finally, the Greatest Creator had to order some gods destroy the city of Maya, ancient Egypt and Atlantis in one night, only left some weak and less intelligent humans on the earth to continue the propagation of the human species.

In order to comfort these men, the Greatest Creator created another planet which is even more beautiful, 960 light years from the earth, it is the “Thousand-year world”. The Greatest Creator told these people, if they behave well and don’t make trouble, they would be able to go to “Thousand-year world” to enjoy happier life after death.??However, these humans started to forget the warning when the population grew to large numbers and its civilization advanced; they began to ignore the Greatest Creator and thought he was nothing special!

At about 4700 years ago, humans on the earth thought that they were able to manage the earth themselves without the help of the Greatest Creator and gods. They ignored their teachings, and insisted their own will. Their pursuit of physical and material comfort far exceeded the pursuit of spiritual growth, which had caused moral degeneracy and the advancement of brute; it strongly destroyed the harmonious atmosphere of the earth. Moreover,the two gods managing the earth had different ethics, thus fought with each other, which made the Greatest Creator so angry that he turned around the earth’s dip angle, huge storms poured down; it lasted for forty days and nights, and drowned most humans and animals, the evil act of humans were then curbed.

But after the Great Flood, Noah’s family were not the only men survived, there were survivors all over the world. This can be verified in many Chinese historical records; the story of “Dayu flood control” is a hard fact. There is also detailed narration in the legends of the Indian tribe Mandan, North Dakota, America.

This is the outline of the origin of human beings.

Please read more articles from: https://newoasisforlife.org/new/forum.php?mod=forumdisplay&fid=84

#Lifechanyuan #the Second Home #Xuefeng #the Greatest Creator #the origin of humanity #Bible

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atplblog · 3 months ago

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lxik2003 · 4 months ago

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Mastering Java Programming: A Comprehensive Guide for Beginners

Introduction to Java Programming

JAVA PROGRAMMING

Java is a high-level, object-oriented programming language that is widely used for building applications across a variety of platforms. Initially developed by Sun Microsystems in 1991 and later acquired by Oracle Corporation,Best Java Course at Rohini has become one of the most popular programming languages due to its robustness, security features, and cross-platform capabilities.

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java

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public class HelloWorld {

// Main method: the entry point of any Java application

public static void main(String[] args) {

System.out.println("Hello, World!"); // Prints Hello, World! to the console

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java

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int number = 10;

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Polymorphism Polymorphism enables objects of different classes to be treated as objects of a common superclass. It allows one interface to be used for different data types.

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If you’re just starting out with Java, it’s essential to grasp the fundamentals like classes, objects, and control structures before moving on to more advanced topics like multi-threading, database connectivity, and design patterns. Happy coding!

#java programming #coding #development

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learning-code-ficusoft · 4 months ago

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Share tips for improving code quality and maintainability.

1. Follow Java Naming Conventions

Classes: Use PascalCase for class names (e.g., EmployeeDetails).

Methods/Variables: Use camelCase for method and variable names (e.g., calculateSalary).

Constants: Use uppercase letters with underscores for constants (e.g., MAX_LENGTH).

2. Use Proper Object-Oriented Principles

Encapsulation: Make fields private and provide public getters and setters to access them.

Inheritance: Reuse code via inheritance but avoid deep inheritance hierarchies that can create tightly coupled systems.

Polymorphism: Use polymorphism to extend functionalities without changing existing code.

3. Write Clean and Readable Code

Keep Methods Small: Each method should do one thing and do it well. If a method is too long or does too much, break it down into smaller methods.

Avoid Nested Loops/Conditionals: Too many nested loops or conditionals can make code hard to read. Extract logic into separate methods or use design patterns like the Strategy or State pattern.

4. Use Design Patterns

Leverage proven design patterns like Singleton, Factory, Observer, and Strategy to solve common problems in a standardized, maintainable way.

Avoid overcomplicating things; use patterns only when they add clarity and solve a specific problem.

5. Implement Proper Error Handling

Use exceptions appropriately. Don’t overuse them, and catch only the exceptions you can handle.

Ensure that exceptions are logged for better debugging and auditing.

Use custom exceptions to represent domain-specific issues, so they are easier to debug.

6. Utilize Java’s Stream API

The Stream API (introduced in Java 8) helps reduce boilerplate code when performing collection operations like filtering, mapping, and reducing.

It makes code more concise and expressive, which helps with readability and maintainability.

7. Write Unit Tests

Use JUnit and Mockito for unit testing and mocking dependencies.

Write test cases for all critical methods and components to ensure the behavior is as expected.

Use Test-Driven Development (TDD) to ensure code correctness from the start.

8. Use Dependency Injection

Prefer Dependency Injection (DI) for managing object creation and dependencies. This decouples components and makes testing easier (using tools like Spring Framework or Guice).

DI helps to make your classes more modular and improves maintainability.

9. Avoid Code Duplication

Use methods or utility classes to avoid repeating code.

If the same logic is used in multiple places, refactor it into a single reusable method.

10. Use Annotations

Use Java annotations (like @Override, @NotNull, @Entity, etc.) to improve code clarity and reduce boilerplate code.

Annotations help to enforce business logic and constraints without having to manually check them.

11. Leverage IDE Features

Use tools like IntelliJ IDEA or Eclipse to automatically format code and identify potential issues.

Many IDEs have integrated tools for running tests, refactoring code, and applying coding standards, so make full use of these features.

12. Optimize for Performance Without Sacrificing Readability

Only optimize performance when necessary. Premature optimization can lead to complex code that’s difficult to maintain.

Profile your code to identify bottlenecks, but prioritize clarity and maintainability over micro-optimizations.

13. Implement Proper Logging

Use a logging framework like SLF4J with Logback or Log4j2 for logging. This provides a consistent logging mechanism across the application.

Ensure that logs are meaningful, providing information about the application’s state, errors, and flow, but avoid excessive logging that clutters output.

14. Document Your Code

Use JavaDocs to generate documentation for public methods and classes.

Document not just the what but also the why behind critical decisions in the codebase.

15. Keep Your Codebase Modular

Break your project into smaller, well-defined modules, and avoid large monolithic classes.

Use packages to group related classes, ensuring that each class or module has a single responsibility.

16. Use Static Analysis Tools

Integrate tools like Checkstyle, PMD, and SonarQube to enforce coding standards, detect bugs, and ensure code quality.

These tools help you identify code smells and areas where quality can be improved.

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freeonlinejavacourse · 6 months ago

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Top 60 most asked Java interview questions: crack like hack

Top 60 most asked Java interview questions It gives this guide easy navigation through every possible concept which could assist you either as a beginner entering into the tech world or an experienced developer wanting to progress and learn technical questions in java. Although, we have blogs related to becoming java developer full guide , how to become graphic designer in 2025 and Java full stack developer course free : A complete guide check it out.

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What is Java? Certainly, Java is a high-level, class-based object-oriented programming language, with minimal implementation dependency. It operates on the principle of “write once, run anywhere.” That is, compiled Java code can be run on all those platforms that support Java without recompilation.”

What are the unique features of Java? -Dynamic -High

Performance -Secure

Robust

Distributed

Multithreaded

Platform-independent

Object-oriented

3.Difference between JDK, JRE, and JVM. -JDK: Java Development Kit: It contains the Java Runtime Environment and an assortment of development tools used for Java application development. -JRE: Java Runtime Environment. This is a part of a computer and thus is not a tool given for Java. It provides the set of libraries and JVM needed to run Java applications. -JVM: Java Virtual Machine. An abstraction of a computer that allows a computer to execute Java programs by converting bytecode into machine-specific code.

4,What do you understand by ClassLoader in Java? ClassLoader in Java is a component of the Java Runtime Environment that is responsible for dynamically loading Java classes into the Java Virtual Machine. A ClassLoader finds and loads the class files at runtime.

5.Explain Object-Oriented Programming (OOP)

OOP is the programming paradigm based on the idea of “objects,” containing both data and code to manipulate that data. Four key important principles:

Encapsulation -Inheritance

Polymorphism

Abstraction

6.What is inheritance in Java?

Inheritance is the process of taking attributes and behaviors from one class to another, It is the mechanism through which a new class (subclass) inherits from an existing one (superclass). Inheritance supports code reusability and creates a relationship between classes, i.e., a superclass-subclass relationship. Top 60 most asked Java interview questions is one of important question

7.Polymorphism in Java?

More simply, polymorphic methods work differently depending on the object invoking them. Thus, polymorphism is of two types: name polymorphism and method overriding.

Compile-time polymorphism (Method Overloading)

Runtime polymorphism (Method Overriding)

8. What is encapsulation in Java?

Certainly, Encapsulation wraps the data (variables) and the code (methods) together as a single unit. Also, Developers achieve this by making the variables private and providing public getter and setter methods. But restricts direct access to some of the object’s components, which can prevent an accident song of data.

9. What is abstraction in Java?

Abstraction refers to the preventing the viewing of the complex implementation details while showing only the essential features of an object. It can be implemented. through abstract classes and interfaces.

10. What is the difference between an abstract class and an interface?

An abstract class is the one with both abstract and concrete methods and can maintain state via instance variables. A class can inherit an abstract class. An interface only has abstract methods (until Java 8, which introduced default and static methods) and cannot maintain state. A class can implement multiple interfaces.

11. What is a constructor in Java?

A constructor is a special method. which is called when an object is created. It has the same name as the class and no return type. It can also be overloaded, meaning that one class can have multiple constructors that can accept different numbers of parameters.

12. What is the difference between method overloading Certainly, Method overloading introduces the same names to multiple methods in the same class. But Method overriding means that a subclass provides a specific implementation. for a method that was already defined in the superclass.

13. What is the ‘this’ keyword in Java?

Although, The ‘this’ keyword refers to the current instance of class. Also It is used to indicate access to class variables and methods, and it helps in distinguishing the class attributes and parameters with identical names. and Top 60 most asked Java interview questions is one of important question

14. What is the ‘super’ keyword in Java?

The ‘super’ keyword refers to the immediate parent class object and can be used to access superclass methods and constructors.

15. A different comparison is the ‘== operator’ and the ‘equals()’ method in Java.

‘== operator’: Reference Comparison. It checks whether both references point to the same object or not.

‘equals()’ method: Compares for equality of the actual contents of the objects.

16. What is a static variable and a static method?

Static Variable: The variable that is shared across all instances of a class. It relates more to the class than to any instance of it.

Static Method: Refers to methods that belong to a class rather than the instance of an object. They do not require an instance of a class to be called.

17. What are Java Collections? Framework is a name given to the entire collection of classes and interfaces forming commonly reusable collection data structures such as lists, sets, queues, and Maps.

18. What is the difference between an ArrayList and a LinkedList in Java?

ArrayList: Certainly, Use dynamic arrays to store elements; it will provide fast random access but will be slow on insertions and deletions, especially in the middle.

LinkedList: Use doubly linked lists to store elements. It provides for faster insertions and deletions, but slower random access.

19. What is a Map in Java? Although, A map is an object that maps keys to values. It does not permit duplicate keys, and each key can map to at most one value worldwide.

20.What is the difference between HashMap and TreeMap in Java?

HashMap: Implements the Map interface using

21.What is the difference between HashSet and TreeSet?

HashSet: Uses a hash table for storage; does not maintain any order of elements.

TreeSet: Implements the NavigableSet interface and uses a red-black tree to maintain elements in sorted order.

22. Explain the differences between List and Set in Java.

List: It allows duplicate elements and maintains insertion order. Set: Does not allow duplicate elements and does not guarantee any particular order.

23. Explain the differences between an array and an ArrayList.

Array: Fixed-size, which can store both primitives and objects. ArrayList: Resizable, storing only objects.

24. What does the final keyword do in Java?

Final Variable: Cannot change its value. Final Method: This Cannot be overridden. Final Class: Cannot be subclassed.

25. What is the difference between String, StringBuilder, and StringBuffer?

String: Immutable, thread-safe. StringBuilder: Mutable, not synchronized, faster than StringBuffer. StringBuffer: Mutable, thread-safe.

26. What is the purpose of the transient keyword in Java?

The transient keyword is used to indicate that a field should not be serialized.

27. What is a volatile keyword in Java?

It ensures all the changes to a variable are visible to all threads. Top 60 most asked Java interview questions is one of important question.

28. What are the differences between synchronized and lock in Java?

Synchronized: Implicit locking mechanism. Lock: Offers more control and flexibility in locking.

29. What is multithreading in Java? Multithreading allows concurrent execution of two or more threads for maximum utilization of CPU.

30. What are the states of a thread in Java?

New

Runnable

Blocked

Waiting

Timed Waiting

Terminated

31. What is the difference between wait(), notify(), and notifyAll()?

wait(): Pauses the thread and releases the lock.

notify(): Wakes up a single thread waiting on the object’s monitor.

notifyAll(): Wakes up all threads waiting on the object’s monitor.

32. What is garbage collection in Java? Garbage collection is the process of automatically reclaiming memory by removing unused objects.

33. What are the types of memory areas allocated by JVM?

Heap

Stack

Method Area

Program Counter Register

Native Method Stack

34. What are the differences between throw and throws?

throw: Used to explicitly throw an exception.

throws: Declares exceptions in the method signature.

35. What is the difference between checked and unchecked exceptions?

Checked Exceptions: Must be handled or declared in the method signature.

Unchecked Exceptions: Runtime exceptions that do not need to be explicitly handled.

36. What is an enum in Java?

Enums are special data types that define the list of constants.

37. What is reflection in Java?

Reflection is the ability to dynamically inspect and modify a class’s behavior during runtime.

38. What is the difference between shallow cloning and deep cloning?

Certainly, Shallow cloning, like cloning, copies the values of all fields without taking into account the objects referred to. But , Deep cloning is like for all fields, a brand new class instance is created at those places. Top 60 most asked Java interview questions is one of important question

39. What are the types of design patterns in Java?

Creational (e.g., Singleton, Factory) Structural (e.g., Adapter, Proxy) Behavioral (e.g., Observer, Strategy)

40. What is the Singleton design pattern?

A design pattern that restricts the instantiation of a class to just one object and provides a global point of access to it.

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