#Simple console calculator in java

[korshubudemycoursesblog]

Unlock Your Programming Potential with the 2025 Core JAVA Bootcamp from Zero to Hero!!

If you’ve ever felt that learning to code in Java was too intimidating or just didn’t know where to begin, we’ve got good news. There’s now a clear, exciting, and structured path to mastering one of the world’s most in-demand programming languages — and you don’t need a tech degree to get started.

Whether you’re looking to launch a career in software development, build Android apps, or simply learn how programming works, the 2025 Core JAVA Bootcamp from Zero to Hero !! is your perfect launchpad.

Let’s explore what makes this bootcamp your best bet for mastering Java and transforming your tech journey in 2025.

Why Java? Why Now?

Java is everywhere. From enterprise software powering Fortune 500 companies to Android apps on billions of devices, Java remains a foundational technology across industries. It’s trusted, flexible, and incredibly versatile.

Still not convinced? Here are a few compelling reasons to dive into Java in 2025:

High Demand for Java Developers: Companies around the globe continue to seek skilled Java developers for both backend and full-stack roles.

Strong Earning Potential: Java developers are among the top-paid software engineers globally.

Massive Community Support: With millions of Java developers worldwide, help is always a click away.

Platform Independence: Java runs on everything from laptops to game consoles, thanks to its “write once, run anywhere” design.

Learning Java in 2025 isn’t just relevant — it’s a smart career move.

What Makes the 2025 Core JAVA Bootcamp Stand Out?

Let’s be real. There are thousands of Java tutorials floating around. Some are outdated. Some are too basic. Others are too complex. What you need is a structured, well-paced, hands-on course that takes you from zero to hero — without the fluff.

That’s where the 2025 Core JAVA Bootcamp from Zero to Hero !! shines.

Here’s why:

✅ Beginner-Friendly Start

This bootcamp assumes no prior coding experience. You’ll start from the very basics — understanding what Java is, how to install it, and writing your very first “Hello World” program.

✅ Hands-On Projects

Theory is good. Practice is better. This bootcamp is packed with real-world mini-projects and coding challenges that help cement every concept.

✅ Up-to-Date Curriculum

Java evolves — and so does this course. The curriculum is aligned with the latest industry practices, including updates for Java 17 and beyond.

✅ Learn at Your Own Pace

Whether you’re a busy professional, student, or a stay-at-home parent making a career switch, the course fits your schedule. You control the pace.

✅ Lifetime Access

Once you enroll, you get lifetime access, meaning you can revisit lessons anytime — especially helpful during job interviews or future projects.

What You’ll Learn Inside the Bootcamp

Here's a peek into what you'll master during the bootcamp:

Java Basics: Data types, variables, operators, and control flow

Object-Oriented Programming: Classes, objects, inheritance, polymorphism, encapsulation, and abstraction

Error Handling: Try-catch blocks, custom exceptions, and debugging tips

Collections Framework: Lists, Sets, Maps, and the power of generics

File I/O and Streams: Reading and writing data like a pro

Multithreading: Understand concurrency and build efficient applications

Java 8+ Features: Lambda expressions, streams API, and functional programming

Simple Game Development: Put theory into practice with a beginner-friendly game project

Database Connectivity (JDBC): Connecting Java apps with MySQL databases

Mini Projects: Including a calculator app, to-do list, contact manager, and more

The 2025 Core JAVA Bootcamp from Zero to Hero !! takes you from baby steps to building your own Java applications — confidently and independently.

Who Should Take This Course?

This bootcamp is designed with clarity and community in mind. You’ll feel guided, supported, and empowered no matter your background.

It’s perfect for:

📌 Absolute beginners with no programming experience

📌 College students looking to level up their skills

📌 Working professionals exploring a career in software development

📌 Aspiring Android developers

📌 Anyone who wants to build a solid foundation in Java

Benefits Beyond the Code

Here’s the thing — it’s not just about learning Java. It’s about building confidence, opening career doors, and future-proofing your skill set.

✅ Boost Your Resume

Adding Java and project work to your portfolio makes you instantly more attractive to employers. You'll not only speak their language — you’ll code in it.

✅ Prep for Interviews

The bootcamp covers essential Java topics often asked in coding interviews. You’ll be better prepared for technical rounds, coding challenges, and whiteboard sessions.

✅ Launch Freelance Work

Once you complete the course, you’ll be ready to take on small Java projects — offering your services on freelance platforms or building your own apps.

Success Stories from Previous Students

Past learners of this course have gone on to land developer jobs, crack interviews at top tech firms, and even start their own freelance businesses.

Here’s what students are saying:

“I came from a non-technical background, but this course made learning Java surprisingly easy. The examples were practical, and I now feel confident enough to apply for Java developer roles.” — Riya M.

“The project-based approach really helped. I didn’t just watch videos — I built things, and that’s what made the knowledge stick.” — Daniel T.

You could be the next success story.

Learning Java in 2025: The Right Time Is Now

There’s never been a better time to start learning Java:

🚀 The job market is booming for Java developers 📈 Companies are seeking scalable, backend solutions — and Java is the answer 🤖 Technologies like machine learning, big data, and enterprise cloud still lean on Java-based solutions

Whether you’re learning for fun, career growth, or personal satisfaction — the 2025 Core JAVA Bootcamp from Zero to Hero !! has the roadmap to take you there.

What You’ll Need to Get Started

Nothing fancy. Just:

A laptop or desktop

Internet connection

A curious mind

A willingness to learn and practice

You don’t need any prior programming experience — just a desire to grow and an hour or two each day to dedicate to learning.

Let’s Talk About Certification

On completion, you’ll receive a certificate that you can showcase on LinkedIn, your resume, or even frame on your wall.

While certification is just one part of the equation, it’s a great way to validate your skills — especially when applying for jobs or bidding on freelance gigs.

What’s the Investment?

Here’s the best part — you don’t need to spend thousands of dollars or attend a coding bootcamp in-person.

You get access to all this learning — plus future updates, support, and community — at a fraction of the cost.

And remember: it’s not just an expense, it’s an investment in your future.

Final Thoughts: You’re Closer Than You Think

Learning to code in Java doesn’t have to be confusing or frustrating. With the right course, guidance, and practice, anyone can learn — including you.

The 2025 Core JAVA Bootcamp from Zero to Hero !! breaks it down into digestible lessons, real-life projects, and fun challenges — making it easy and enjoyable to stay motivated and on track.

So if you’re ready to finally conquer Java and take a big step toward your tech career or passion project, this is your moment.

👉 Start your journey from Zero to Hero today.

[saltykingdombeliever]

Electricity Bill Program in Java

If you're just starting out with Java or need a simple project for your final year submission, check out the Electricity Bill Program in Java. It’s a console-based application that calculates your electricity bill based on units consumed using a real-world slab system.

This project is: ✔️ Easy to understand ✔️ Great for beginners ✔️ Perfect for quick academic submissions

No frameworks, no fuss — just pure Java logic!

👉 Download the complete project with source code here: 🔗 Electricity Bill Program in Java

Need more student-friendly projects? Explore more at Projects for Everyone

[lakshmisssit]

How to Get Started with Java Projects: Ideas for Beginners

So, you've started learning Java — great choice! Whether you're diving into tutorials or enrolled in the best Java training in Hyderabad, the real magic begins when you start building your own projects. It’s the best way to truly understand how everything comes together.

1. Build a Simple Calculator

This is the go-to first project for beginners. A calculator helps you get comfortable with basic concepts like variables, conditionals, and loops. Once you’re done with a console version, try adding a graphical interface using JavaFX.

2. Create a To-Do List App

Everyone loves checking off tasks! This project teaches you how to handle user input, store data, and build simple interfaces. You can even take it a step further by saving tasks to a file or database.

3. Guess the Number Game

Here’s a fun one. Computers choose numbers, and users must guess them. It sounds simple, but it's a great way to practice loops, random number generation, and handling user input.

4. Student Management System

Ready for something more real-world? Build a system that stores student details, calculates grades, and generates unique IDs. It’s perfect for learning object-oriented programming and working with files or basic databases.

5. Library Management System

This one's a bit more advanced. IThe process involves keeping track of due dates, users, and books. You’ll get to explore concepts like CRUD operations and data handling in a structured way.

Wrapping Up

Starting small and working your way up is the best approach when learning Java. And if you ever feel stuck or want expert guidance, SSSIT Computer Education is here to help you level up your skills with hands-on training and real-time project support.

[souhaillaghchimdev]

Java Programming for Beginners

Java is a powerful, object-oriented programming language used to build everything from web apps and mobile apps to desktop software and enterprise systems. If you're just starting your programming journey, Java is a great language to learn. This guide introduces you to the basics and helps you take your first steps with confidence.

Why Learn Java?

Platform Independent: Java code runs on any device with a Java Virtual Machine (JVM).

Object-Oriented: Encourages clean, modular, and scalable code.

Wide Usage: Used in Android development, enterprise software, games, and more.

Strong Community: Huge ecosystem with thousands of libraries and tools.

Setting Up Java

Download and install the Java Development Kit (JDK).

Install an IDE (like IntelliJ IDEA, Eclipse, or VS Code).

Write your first Java program!

Your First Java Program

public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, world!"); } }

This simple program prints "Hello, world!" to the console — the classic first step for all programmers!

Key Java Concepts

Variables: Used to store data (e.g., int age = 25;)

Data Types: int, float, double, boolean, String, etc.

Control Structures: if, else, switch, for loop, while loop

Methods: Functions that define behavior

Classes & Objects: The foundation of object-oriented programming

Example: A Simple Java Class

public class Car { String brand; int year; public void drive() { System.out.println(brand + " is driving."); } }

Practice Ideas for Beginners

Create a calculator using basic math operations

Build a simple to-do list console app

Write a program that checks if a number is prime

Make a guessing game with loops and conditions

Helpful Resources to Learn Java

W3Schools Java Tutorial

Codecademy Java Course

GeeksforGeeks Java Section

Official Java Tutorials

Conclusion

Java is a reliable and versatile language that will serve you well throughout your software development journey. Start with the basics, practice consistently, and don’t be afraid to experiment and break things — that’s how real learning happens!

[akrnd085]

AWS Lambda: Harnessing Serverless Computing

AWS Lambda graviton is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you. This article will explore the capabilities, use cases, and best practices for AWS Lambda, incorporating relevant examples and code snippets.

Understanding AWS Lambda graviton AWS Lambda allows you to run code without provisioning or managing servers. You can run code for virtually any type of application or backend service with zero administration. Lambda automatically scales your application by running code in response to each trigger.

Key Features of AWS Lambda Automatic Scaling: Lambda functions automatically scale with the number of triggers. Cost-Effective: You only pay for the compute time you consume. Event-Driven: Integrates with AWS services seamlessly to respond to events. Setting Up a Lambda Function 1. Create a Function: In the AWS Management Console, select Lambda and create a new function.

2. Configure Triggers: Choose triggers like HTTP requests via Amazon API Gateway or file uploads to S3.

3. Upload Your Code: Write your function code in languages like Python, Node.js, Java, or Go.

Example of a simple Lambda function in Python: import json

def lambda_handler(event, context):

print(“Received event: “ + json.dumps(event, indent=2))

return {

‘statusCode’: 200,

‘body’: json.dumps(‘Hello from Lambda!’)

} Deployment and Execution Deploy your code by uploading it directly in the AWS Console or through AWS CLI.

Lambda functions are stateless; they can quickly scale and process individual triggers independently.

Integrating AWS Lambda with Other Services Lambda can be integrated with services like Amazon S3, DynamoDB, Kinesis, and API Gateway. This integration allows for a wide range of applications like data processing, real-time file processing, and serverless web applications.

Monitoring and Debugging AWS Lambda integrates with CloudWatch for logging and monitoring. Use CloudWatch metrics to monitor the invocation, duration, and performance of your functions.

Best Practices for Using AWS Lambda Optimize Execution Time: Keep your Lambda functions lean to reduce execution time. Error Handling: Implement robust error handling within your Lambda functions. Security: Use IAM roles and VPC to secure your Lambda functions. Version Control: Manage different versions and aliases of your Lambda functions for better control. Use Cases for AWS Lambda Web Applications: Build serverless web applications by integrating with Amazon API Gateway. Data Processing: Real-time processing of data streams or batch files. Automation: Automate AWS services and resources management. Performance Tuning and Limitations Be aware of the execution limits like execution timeout and memory allocation. Optimize your code for cold start performance. Cost Management Monitor and manage the number of invocations and execution duration to control costs. Utilize AWS Lambda’s pricing calculator to estimate costs. Conclusion AWS Lambda graviton represents a paradigm shift in cloud computing, offering a highly scalable, event-driven platform that is both powerful and cost-effective. By understanding and implementing best practices for Lambda and incorporating ECS agents, developers can build highly responsive, efficient, and scalable applications without the overhead of managing servers. ECS agent enhance this infrastructure by enabling the seamless deployment and management of Docker containers, offering a flexible and efficient approach to application development and deployment. With Lambda and ECS agents working together, developers can leverage the benefits of serverless computing while ensuring optimal performance and resource utilization in containerized environments.

[myprogrammingsolver]

Introduction to Java Programming

Problem Description Write a program, In2pJ, which reads in an infix expression from the console and outputs a postfix expression that can subsequently be processed by a simple interpreter. This output will be used in Assignment 5 to create a simple 4-function calculator, as outlined in the lecture slides for Lectures 14 and 15, Pages 31-36. You are not being asked to do a full implementation of…

[priyadevi0402]

Understanding the Python Interpreter and Its Features

            An interpreter serves as a software tool that converts a developer's code into an intermediary language referred to as bytecode. This translation takes place on a line-by-line basis, and the interpreter halts the process upon encountering an error, thereby streamlining the debugging procedure. Python and Java are well-known instances of interpreted programming languages.

Python interpreter :

The Python interpreter is the tool where developers write and execute Python code. In this article, we will delve into the workings of the Python interpreter, exploring its environment and capabilities through practical coding examples.

Working of Python Interpreter:

When you run a Python code, like a simple "Hello, World!" program, several steps happen

The program is converted into a special code called bytecode, which is a kind of binary code that the processor can't directly understand.

The Python Interpreter, stored as a set of binary instructions in the memory, handles this conversion. These instructions are like a mix of a compiler and a Python Virtual Machine (PVM).

The compiler changes the source code (like the "Hello, World!" program) into bytecode, which the PVM can interpret across different platforms.

The PVM reads and runs the bytecode on the hardware, acting as a processor. This is how the Python interpreter works. The visual summary below outlines this process.

Features of Python Interpreter:

The Python Interpreter provides several convenient features, such as:

Interactive editing

Use of previously initialized variables

Ability to write extensive code with a readline feature

Enabling command-line editing by pressing Ctrl+P, which triggers an activation beep.

Getting started with the Python Interpreter:

To open the installed Python Interpreter, you can search for it in the Start menu and select the appropriate version, such as Python 3.9. On Windows, it resembles Command Prompt, while on Mac, it looks like a terminal.

The interpreter environment operates using REPL (Read-Eval-Print Loop), which involves reading, evaluating, and executing code, along with printing output to the console. This process repeats iteratively.

Upon opening the Python interpreter, you'll see a brief overview of the Python version and storage, along with three arrows (>>>), signifying the code entry point.

Coding in the Python Interpreter Environment:

• To begin with the Python Interpreter, access the installed Python interpreter on your system by searching for it in the Start menu. On Windows, it resembles a Command Prompt, while on Mac, it appears as a terminal.

• The interpreter operates using the Read-Evaluate-Print Loop (REPL) method, involving reading code lines, evaluating and executing the code, and printing any output to the console. This process repeats in a loop.

• Coding in the Python Interpreter Environment is facilitated by interactive editing. After writing the code, pressing the "Enter" button displays the results.

• For example, the simple "Hello, World!" code prints the output accordingly. Additionally, the interpreter allows for multi-line code input and functions as a calculator for executing arithmetic operations.

• Furthermore, the Python interpreter enables the passing of command-line arguments. These arguments are stored as a list of strings using the 'sys' library, inherited from the C language.

• Programming queries related to interpreter usage and various scenarios are addressed with illustrative code snippets.

            Comprehending the Python interpreter and its functionalities holds significant importance for Python developers at all levels. This comprehensive article sheds light on the interpreter's behavior and capabilities, serving as a valuable resource for both novices and experienced programmers. If you have any further inquiries or need more information, please feel free to get in touch.

            If you're looking to improve your Python skills, ACTE Technologies is a great choice. Their skilled instructors offer thorough and effective Python training. Whether you prefer online or in-person learning, they provide a flexible educational environment. ACTE Technologies' Python program includes certification options and support for finding job placements.

[javacodingtips]

How do I start programming in Java for beginners?

Java is one of the most widely-used and beginner-friendly programming languages in the world. Known for its platform independence, object-oriented structure, and vast ecosystem, Java is an excellent starting point for those new to programming. Whether you aim to develop Android apps, enterprise software, or web applications, learning Java lays a solid foundation.

If you're asking, "How do I start programming in Java as a beginner?", this article will guide you step-by-step through the journey, with no prior coding experience needed.

 Why Choose Java as a First Programming Language?

Before diving in, let’s explore why Java is ideal for beginners:

Simple and Readable Syntax: Java is easy to learn with a syntax that’s close to English.

Strong Community Support: You’ll never be alone with issues—millions of Java developers and forums are out there to help.

Platform Independence: Thanks to the JVM (Java Virtual Machine), your code can run on any device.

Object-Oriented Approach: Java teaches core programming concepts like classes, inheritance, and polymorphism early on.

Step-by-Step Guide to Start Programming in Java

Step 1: Understand the Basics of Programming

Before touching code, it’s important to understand key concepts like:

What is a variable?

What is a data type?

What are loops and conditionals?

What is an object and a class?

You don’t need to master them all at once, but having a clear understanding of basic programming logic is essential.

Step 2: Set Up Your Development Environment

To start programming in Java, you need:

Java Development Kit (JDK) Download the latest version of JDK from Oracle’s official website and install it on your system.

IDE (Integrated Development Environment) IDEs make writing code easier and more efficient. Recommended IDEs include:

IntelliJ IDEA (great for beginners and professionals)

Eclipse

NetBeans

These tools offer features like syntax highlighting, code completion, debugging, and real-time error checking.

Step 3: Write Your First Java Program

Once your environment is ready, start with a simple “Hello, World” program:

java

How to run it:

Save the file as HelloWorld.java

Open the terminal/command prompt

Compile using javac HelloWorld.java

Run using java HelloWorld

You’ve now written and run your first Java program!

Step 4: Learn Java Syntax and Core Concepts

The next step is to dive deeper into Java’s syntax and essential topics, such as:

Variables and Data Types

Operators

Control Statements (if, switch, loops)

Arrays

Methods

Object-Oriented Programming (Classes, Objects, Inheritance, etc.)

Structured learning with hands-on coding is the most effective way to grasp these concepts. If you're looking for guided instruction, enrolling in the Best Java training in Chandigarh can provide you with instructor-led classes, real-world projects, and personalized feedback.

Step 5: Practice Through Challenges and Mini Projects

As with any skill, practice is key. You can improve your Java skills by:

Solving basic to intermediate coding problems on platforms like HackerRank, LeetCode, or CodeGym

Rewriting small console applications (like a calculator or to-do list)

Understanding error messages and debugging your own code

The more code you write, the more confident you'll become

Step 6: Build Real-World Projects

Once you’re comfortable with the basics, apply your knowledge to real-world applications. Some beginner project ideas include:

Simple Banking System

Student Record Management

Mini Quiz Game

Weather App using APIs

Projects help you understand how different components of Java come together—like file handling, loops, arrays, and OOP principles.

 Useful Resources to Learn Java

Books:

Head First Java by Kathy Sierra

Java: The Complete Reference by Herbert Schildt

YouTube Channels:

Programming with Mosh

Telusko

CodeWithHarry (Hindi-friendly tutorials)

Online Platforms:

Coursera (Java for Beginners)

Udemy (Project-based courses)

GeeksforGeeks and W3Schools (Documentation & examples)

 Tips for Beginners Learning Java

Start slow; don’t rush into frameworks before understanding core concepts.

Practice consistently, even 30 minutes daily can make a difference.

Join online communities and coding forums.

Make errors—debugging is part of learning.

Don’t just copy-paste code. Understand what each line does.

Final Thoughts

Starting Java programming as a beginner might seem overwhelming, but with the right roadmap and consistent effort, it becomes an exciting and rewarding journey. Java not only introduces you to foundational programming concepts but also prepares you for careers in software development, web apps, Android apps, and more.

If you're serious about learning efficiently and want to take a structured path, enrolling in the Best Java training in Chandigarh will provide expert mentorship, hands-on projects, and job-oriented learning.

[liminal-librarian]

(Agree) Emulators are cool and all, Java itself is a VM. So yes, it's possible to achieve reasonable playability with an emulator.

(Agree) To say nothing of the fact that the kinds of games that I play most often aren't bleeding edge graphics, therefore aren't maxing out the capabilities of any modern system to keep the render framerate up.

But I have worked on games that do bypass the kernel to talk directly to the hardware. I've even reverse-engineered what you'd think was a simple chat program far enough to realise that the reason it was so bloated was that its main threads were cross-compiled to also run on every major brand of video card, to mostly free up the main CPU for other programs.

(Agree) When you have a triple-A game studio, they have the tech expertise to do things like that and ought to distribute for everyone/for every system that can support what the game needs.

(Disagree) When indie developers only have a fraction of that expertise and budget, but need tight integration with hardware to be performant, sometimes an emulator isn't possible. And sometimes the systems in question aren't as monolithic a design as advertised, you need to do a system check to figure out which of the 'roll your own' drivers should get loaded.

If the system you end up running on doesn't match any of the drivers you made, or more to the point, any of the systems checks you found how to do first before loading the wrong driver borks the whole system, there can be literally nothing left to choose from to proceed. The game isn't blue screening out of malice, but because it woke up on Mars and doesn't know how to breathe.

Unless the emulator system already exists to develop for, in which case, yeah, that can be calculated as a separate variant of the same system, and we're back to arguing whether someone can be sued for not doing extra work.

(Agree) It is possible to fix the game issue (given enough time and money, and available documentation, and the target system having the capabilities needed by the game).

(Disagree) Not nessacerily easy.

(Agree and disagree, like an elf) The point of consoles is to be a consistent architecture, to streamline the design process and make games cheaper to develop. This ought to mean exclusive games (in the sense of designed to run on a single system) are a dime a dozen, metaphorically. And you can't get mad at developers for accepting this incentive. (This consistent architecture, if it really exists, should also be simple to build an emulation for. Good luck.)

(Agree) The original post discusses exclusivity deals, which implies the console producer paying the third party developer NOT TO release their games on other systems, which is a different (legal/contract) issue. That probably should be challenged with antitrust laws. But that is a different thing from the technical issue of making/letting a game run on multiple systems.

I think exclusivity deals ought to be illegal, and less or more treated as collision. They are flat-out bad for the consumer; no one who uses Spotify is better off with Spotify having the exclusive rights to a particular podcast, and are in fact worse off for having to pay more per month to fund the deal.

No one who plays video games is better off for PlayStation or whatever being the only one with a particular third party game, and is in fact worse off for having less choice.

[rolligun]

Simple console calculator in java

#Simple console calculator in java how to#

#Simple console calculator in java generator#

#Simple console calculator in java manual#

This is because hitting the minus key triggers the calculation of the first So 5 * 20 - 14 = should give 86 as the result. Enter 12 + 10 = in the calculator and notice that the correct Also, the value of firstOperand is updated to the result so that it This result is subsequently displayed to the user by updating the displayValue The result is saved in the result variable. If so, the calculate function is invoked and The else if block added to handleOperator checks if the operator property An example of a valid expression is shown below:Ĭonst calculator = (addition, subtraction, multiplication and division) on our calculator app byĬonstructing a valid expression using the input buttons, and have the resultĭisplayed on the screen. Getting startedĪnyone should be able to perform the four most common arithmetic operations Feel free to do this tutorial on other online code playgrounds Start by forking the code to a new fiddle, and follow along by typing each step The calculator layout was crafted, but I made a few minor changes so make sure It contains all the necessary markup and styles Before you beginįor this tutorial on JSFiddle. You have no prior experience with building applications in the browser. To break down each step as best as I can so it should be easy to follow even if This tutorial assumes that you have a basic knowledge of JavaScript. You can play around with it to get a feel of what you’ll be building On the JavaScript logic employed to make the calculator work. If you’d like to learn how it was achieved, be sure to check out this More or less in the manner of those calculators found at grocery stores. The calculator app we’ll develop in this tutorial is a very simple one.

#Simple console calculator in java how to#

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#Simple console calculator in java generator#

1 Build your first JavaScript App - A Random Quote Generator.JavaScript projects for beginners (8 part This epic tutorial provides a solid workout for JavaScript newbies by describing how a simple calculator application can be developed with the language. Import on AugHow to build a Calculator App with JavaScript Modify the MainActivity.java as provided below. Complete description of the code is provided in comments. There are two gradient shapes in this code one is for button pressed state and another for the normal state. This drawable resource is used to decorate the buttons of the calculator. Replace the content of button.xml by the following code. In your code make sure that you have included these four attributes for all the Buttons. In this code, some common properties of Buttons are not provided to reduce the length of this tutorial.

#Simple console calculator in java manual#

TextView is used instead of EditText, in order to prevent manual user input using the default keypad of Android. This code creates a TextView as the calculator number screen and some necessary buttons. Replace the content of the activity_main.xml file by the following code.

[programmingsolver]

Introduction to Java Programming

Problem Description   Write a program, In2pJ, which reads in an infix expression from the console and outputs a postfix expression that can subsequently be processed by a simple interpreter. This output will be used in Assignment 5 to create a simple 4-function calculator, as outlined in the lecture slides for Lectures 14 and 15, Pages 31-36. You are not being asked to do a full implementation of…

[datasciencelearning97]

Everything To Know About NodeJs

While several activities take place in the background or the backend of our website, the user only really interacts with the front end of any program, not the backend. Any program essentially consists of three components: the front end, with which users interact, the back end server, and the back end database. We can utilize relational or non-relational databases for backend databases, and NodeJS, Java, Python, etc. for backend servers.

What is Node js?

We’ll look into what Node js is. Every time a client uses the client side of an application to request something, the request is first sent to the server, where it is processed or calculated to validate the client-side request. Once all of this validation is complete, a response is then provided to the client side. This NodeJs JavaScript framework is used for all of these calculations and processing. NodeJS is essentially utilized as an open-source and cross-platform JavaScript runtime environment for our web apps that are run outside of the client's browser. This is what we use to run server-side apps. It is employed in developing I/O-intensive applications, including those for online chat, video streaming, and other uses. NodeJs is a framework that is used in many well-established tech major corporations and recent start-ups.

What is the Need for NodeJs?

NodeJs is constructed using the V8 engine from Google Chrome, which results in an extremely speedy execution time. NodeJs is highly helpful for developing real-time and data-intensive web apps because it does not require waiting for an API to return data. Because of its wholly asynchronous nature, it is completely non-blocking. Due to greater code synchronization between the client and server due to sharing the same code base, NodeJs speeds up the loading time for audio and video files. Since NodeJs is open-source and is merely a JavaScript framework, beginning the development of projects with it is quite simple for developers who are already familiar with JavaScript.

Components of NodeJs

Modules A Node.js application can use modules, which are essentially JavaScript libraries, to include a collection of functions. Use the require() function with the module name in the parenthesis to include a module in a Node.js application.

Consoles The console is a module that offers a debugging technique that is comparable to the fundamental JavaScript console offered by web browsers. Messages are printed to stderr and stdout.

Clusters The foundation of Node.js is single-threaded programming. A module called Cluster enables multi-threading by generating child processes that simultaneously run on the same server port and share the same server.

Global In Node.js, all modules have access to global objects. These items include strings, modules, functions, and more.

Error Handling There are four types of errors in NodeJs. They are listed below. i)Standard JavaScript Libraries ii) System Errors iii) User-Specific Errors iv) Assertion Errors

Streaming The process of reading or writing data continuously by Objects is called Streaming. The four types of streams are listed below: i) Readable The process of reading data from streams is called Readable Streams. ii) Writable These are the streams that can be used to write data. iii) Duplex Both Readable and Writeable data streams are called Duplex Streams. iv) Transform Streams that let data manipulation while being read or written are called Transform Streaming.

Buffer A module called Buffer enables the handling of streams with just binary data.

Domain Errors that go unhandled are intercepted by the domain module. These mistakes are stopped using two techniques:

Internal Binding: The run function is where the code for the error emitter is executed. External Binding: Using the add method, an error emitter is explicitly added to a domain.

DNS This module is used to connect to the DNS server and solve the name resolution problem.

Debugger A built-in debugging client can use the debugging tool that is part of Node.js. Although the Node.js debugger is not feature-rich, it does provide basic code inspection. By placing the 'inspect' keyword before the name of the JavaScript file, the debugger can be used in the terminal.

Conclusion In this article, we have discussed the definition of NodeJs, the components of NodeJs, and the need for NodeJs. NodeJs is used as a Front-End framework, and also as a Back-End framework. Front-End, and Back-End frameworks, both form the backbone of Full Stack. And hence, the need for Full Stack Developers to upskill himself/herself with Full Stack technologies. Full Stack developers are in great demand by top product-based organizations. Where can a candidate equip himself/herself with the right skillset relating to Full Stack? There are many institutes in our country that train candidates in the domain of Full Stack, but at SkillSlash, an online based learning platform, candidates are provided 1:1 mentorship and are made to work on live projects. Skillslash also has in store, exclusive courses like Data Science Course In gurgaon, Full Stack Developer Course and Data Structure and Algorithm and System Design Course to ensure aspirants of each domain have a great learning journey and a secure future in these fields. Skillslash has developed a massive online presence in other domains too. To find out how you can make a career in the IT and tech field with Skillslash, contact the student support team.

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"Tech Giants' Choice: The Appeal of Python's Advantages"

               Python is a general-purpose dynamic programming language that provides high-level readability and is interpreted. As Python is a dynamic programming language, it has some helpful advantages, so now we will learn about the Advantages of Python.

I gained expertise in Python programming through my training at ACTE Technologies. This learning experience was thorough and valuable. ACTE Technologies offered a well-structured Python course that enabled me to understand the basics of the language and advance to more advanced concepts.

The Main Advantages of Python Applications:

Simple and Easy to Learn                Python is incredibly easy to learn and read because its syntax is similar to English. It's a powerful language that's also free and open source. You don't need to be highly skilled to start learning Python. It's a high-level language, meaning you can write code that's more human-readable, and Python takes care of converting it to a language the computer understands. Python helps catch errors early by interpreting the code.

Portable and Extensible

               Python's portability and extensibility are significant advantages. It can run on various platforms, including Windows, Linux, Macintosh, and even gaming consoles that support Python. Python's extensibility allows you to integrate components from other programming languages like Java and .NET. Additionally, you can invoke libraries written in languages like C and C++.

3. Object-Oriented Programming

               Python's support for object-oriented programming (OOP) is a valuable feature. It allows for concepts like polymorphism and inheritance, which make code more flexible and reusable. In Python, you can create shareable classes, enabling the reuse of code and providing a protective layer by abstracting knowledge. This makes it easier to develop prototypes quickly and write efficient and organized code, making Python a popular choice for many software development projects.

4.Artificial Intelligence

               Artificial Intelligence (AI) involves creating computer programs that can mimic human intelligence and perform smart tasks using algorithms and programs. Python plays a significant role in AI development. It has libraries like scikit-learn, which simplify complex calculations with concise code. Additionally, popular AI libraries such as Keras and TensorFlow are seamlessly integrated with Python, enhancing its machine learning capabilities.

5. Computer Graphics                 

               Python is a versatile programming language that serves developers well in various domains. It finds extensive use in both small and large-scale projects for creating Graphical User Interfaces (GUI) and developing desktop applications. Additionally, Python offers a dedicated game development framework, empowering developers to create interactive games and applications efficiently. Whether for GUI-based software or gaming projects, Python provides robust solutions to meet diverse development needs.

6. Testing Framework:

             Python is well-suited for startups and product development. It offers integrated testing frameworks, like Pytest and Selenium, making it easier to conduct automated testing, detect and fix bugs, and streamline workflows.

7.Big Data:

               Python is capable of handling large datasets and supports parallel computing. Libraries like Pydoop, Pandas, and PySpark enable data processing, analysis, and manipulation, making Python a valuable tool in the field of big data.

8. Scripting and Automation:

               Python serves as an excellent scripting language. You can write scripts to automate tasks, such as web scraping, content posting, or any repetitive processes, making it a versatile choice for automation.

9. Data Science:

               Python has become the preferred language for data scientists due to libraries like NumPy, Pandas, Matplotlib, and Seaborn. It excels in data analysis, visualization, and manipulation, helping researchers gain insights from vast datasets.

10.Popularity and High Salary:

               Python's popularity has surged in recent years, and Python programmers often receive competitive salaries. Prominent tech companies like Google, YouTube, Instagram, Dropbox, and Facebook rely on Python for various purposes, contributing to its widespread use. Its ease of use and versatility make Python a top choice for both beginners and experienced programmers in various domains.

You can enroll in Python training at ACTE Technologies, where they offer comprehensive programs to help you become proficient in Python programming. These courses cover everything from the basics of Python to advanced topics like data science, machine learning, and web development. ACTE Technologies provides a structured and hands-on learning experience, allowing you to gain practical skills in Python for various purposes.

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Advanced Java programming with JavaFx: Write an email client

Advanced Java programming with JavaFx: Write an email client

Seeing a message printed on the console when you click a button can be rewarding, but at some point you need to go beyond the basics of JavaFX. Project based learning is the best approach to become a competent JavaFX programmer. Writing a calculator app is fun, but you know what is funnier? Getting a job as a programmer. You can’t get there just by coding simple apps or watching…

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Deliver Scalable Experiences Without Limits Using Functions We’re proud to launch the Salesforce Functions Beta in our Summer ‘21 release, and we look forward to its GA in our Winter ’22 release. Salesforce Functions is a new service on the Salesforce Platform that enables you to deliver more scalable experiences by extending the data and workflows that you already have, making them more robust with the power of elastic compute and open language flexibility. You can now significantly accelerate developer productivity on trusted, managed Salesforce infrastructure through pre-authenticated and preconfigured access to Salesforce data and integration with low-code tools like Flow. Functions allows developers to write code that implements their business logic, which can then be assembled as building blocks in Flows or integrated with Lightning Web Components. Salesforce Functions amplifies low-code productivity with the power and flexibility of custom software, including access to open language ecosystems of libraries and packages. Let’s take a deeper look into what this actually means, and along the way, we’ll show you the updated Developer Tools experience. What’s new in the Salesforce Functions Beta Higher performance with no limits and elastic scale Build applications faster and without limits for more complex business logic or compute-intensive traffic/request activity. Salesforce Functions retains all the security and compliance you trust Salesforce to provide, so you no longer need to deal with VPNs, security tokens, Cloud IAM, and all the DIY complexity when you go off of the Salesforce Platform. Open languages and framework support in your SFDX project, including Java and Node.js Functions let you program in industry-standard languages, such as Node.js and Java. This brings the expressive power of these languages to your apps, as well as the entire ecosystem of tools, libraries, and developers to accelerate your time to market. Familiar tools and native low code integration Functions are fully integrated into the Salesforce Developer Experience and are invoked directly from Apex, making them easy to add to Flows and the simplest way to add complex business logic to your apps. One CLI for development The Salesforce CLI is being enhanced with a new global executable, sf, that simplifies how you build, manage, and deploy across Salesforce.   Functions use case: running compute heavy and high-performance workloads In this blog post, we’re going to create a Java Function that processes a very large data set. Without Functions, it would be impossible to handle a data set this large in Apex, and many users would have had to implement complex workarounds to remain within their Apex limits. With Functions, you can overcome these kinds of computational limitations. In this example, the Function loads the complete six-thousand-record data set into memory. In the following example, we will use Functions to find a code school that is closest to a specific geographic point. It will also iterate over the data set to calculate the distance from a point of origin, sorting the results by distance, and then returning the ones that are closer to the provided location. This can be done in a few simple steps: Write a Function in an SFDX project Run and debug your Function locally to validate logic Deploy the Function to a Salesforce Org Integrate with low code: invoke the Function through Apex Done – you’ve leveraged the compute capabilities from declarative tools. Functions can be written in a Salesforce DX project by using the Salesforce CLI or Visual Studio Code editor with the Salesforce Extension Pack. To create a project with this new command structure using the Salesforce CLI, run: $ sfdx generate:project -n sfdx_functions_project The Visual Studio Code editor with the Salesforce Extension Pack will create a project with the necessary files to start developing for the Salesforce Platform. After creating the project, we can start writing our Functions, by using either Java or JavaScript. Let’s generate the processlargedata function in Java with the Salesforce CLI: $ sfdx generate:function -n processlargedata -l java Or using the Visual Studio Code SFDX: Create Function command: Generate a Function from Visual Studio Code This will generate a Java project under the functions folder with all the necessary files to write your Function and run tests locally. Let’s update the auto-generated Function with the use case we described above. The full source code for this project in the Functions Recipes Sample Application is available on Github.com. { school.setDistance( distance( latitudeSt, longitudeSt, school.getLatitude(), school.getLongitude())); return school; }) .sorted(Comparator.comparingDouble(School::getDistance)) .limit(length) .collect(Collectors.toList()); LOGGER.info("Function successfully filtered {} schools", schools.size()); return new FunctionOutput(schools); } // ... A Java Salesforce Function receives two parameters: an InvocationEvent that contains the input payload of the Function the Context, which has access to the authenticated Salesforce Org and the SDK. (Note: Node.js Functions contains a 3rd parameter Logger, which is used for logging operations). This ProcessLargeDataFunction receives a JSON payload with latitude, longitude, and length, and returns a list of the nearest schools to that starting point specified in the input payload. Now, let’s see how can we run this Function locally. Running your first Function A Salesforce Function can be executed locally by using the CLI, which is a useful way to develop and test your Function without deploying it to a Salesforce Org. Local execution can be also integrated with an authenticated Salesforce Org when doing the invocation. You can start this Function locally by running: $ sfdx run:function:start Or by using the Visual Studio Code SFDX: Start Function command: Start a Function from Visual Studio Code This will build and run the Function locally, and it will be ready to start receiving invocation requests. A Function running locally from Visual Studio Code Now that our Function is running locally, we will use a JSON payload to invoke the Function. Let’s create a payload.json in the function folder with the following information: { "latitude": "36.169090", "longitude": "-115.140579", "length": 5 } This payload information represents the point of origin and the number of results it will return. It will be received by the Function in the InvocationEvent object. You can invoke the Function with this input payload from the CLI by running: $ sfdx run:function --url=http://localhost:8080 --payload=@payload.json Or, you can do this from Visual Studio Code by opening the payload.json file, and clicking on the Invoke CodeLens action: Invoking a Function from Visual Studio Code with CodeLens You have seen how to generate, run, and invoke your first Salesforce Function using the Salesforce Developer Tools. Now it is time to connect to a Salesforce Organization, create a compute environment, and deploy the Function. Deploying your first Function We have been able to run our Function locally thanks to the Salesforce Developer Tools, but the real power of Salesforce Functions comes when they are running in our serverless compute environment. Let’s deploy our Function to a Salesforce Organization. To do that, we need to create a Compute Environment and connect it to an Org by running: $ sfdx env:create:compute -o connected_org_alias -a compute_env_alias Then, we need to deploy our Salesforce project and Functions. The upcoming sf CLI will allow you to deploy your project metadata along with the Function in a single command. But until then, we have to do that using sfdx in two steps: $ sfdx force:source:push $ sfdx project:deploy:functions -o connected_org_alias Now that our project is deployed, we can invoke the Function from Apex by using the new Function class: functions.Function fn = functions.Function.get('sfdx_functions_project.processlargedata'); functions.FunctionInvocation invocation = fn.invoke('{"latitude": "36.169090", "longitude": "-115.140579", "length": 5}'); String jsonResponse = invocation.getResponse(); System.debug('Got response' + jsonResponse); Triggering a Function with Apex from the Developer Console Integrating your Function with low-code tools Now that our Function can be invoked through Apex, we can integrate it with a Flow or Lightning Web Component. Let’s create an Apex class, FindCodeSchools.cls, that invokes the ProcessLargeData Function from a Flow. The full source code for this project in the Functions Recipes Sample Application repo is available on Github.com. input) { Input payload = input.get(0); // Get a Reference of the ProcessLargeData Function functions.Function fn = functions.Function.get( 'sfdx_functions_project.processlargedata' ); // Invoke the ProcessLargeData Function functions.FunctionInvocation invocation = fn.invoke( JSON.serialize(payload) ); String response = invocation.getResponse(); // Serialize the Response into an Object Output output = (Output) JSON.deserialize(response, Output.class); return output.schools; } // ... } With this Apex class with an @InvocableMethod, we will create a new Flow that triggers this method as an Apex action and use the output as we see fit. You can also trigger the Function from an LWC component by using the @AuraEnabled annotation. Invoke the FindSchools Apex Method from a Flow As you can see below, we seamlessly integrate the power of the compute capabilities of Salesforce Functions with the low-code simplicity of Flow. Flow integrated with a Salesforce Function Learn more We’re excited to see what you build using Salesforce Functions. Please nominate yourself for the Invite Beta. About the authors Julián Duque is a Lead Developer Advocate at Salesforce. Connect with him on Twitter @julian_duque. Khushboo Goel is a Sr. Product Marketing Manager at Salesforce. Connect with her on Twitter @kgoel31.