#Decorator design pattern java example

[souhaillaghchimdev]

Learning Design Patterns in Programming

Design patterns are reusable solutions to common software design problems. Whether you're a beginner or an experienced developer, learning design patterns can greatly improve your ability to write clean, scalable, and maintainable code. This post introduces the concept of design patterns, why they're important, and how you can start using them effectively in your projects.

What Are Design Patterns?

A design pattern is a proven way to solve a specific problem in software design. These patterns are not code snippets but templates or best practices that guide developers in structuring their programs.

Why Use Design Patterns?

Code Reusability: Promotes the use of reusable solutions.

Scalability: Makes it easier to scale applications.

Maintainability: Leads to cleaner and more organized code.

Team Collaboration: Helps teams follow a shared vocabulary and approach.

Problem Solving: Speeds up decision-making by providing tried-and-tested approaches.

Categories of Design Patterns

Creational Patterns: Focus on object creation mechanisms (e.g., Singleton, Factory).

Structural Patterns: Deal with object composition (e.g., Adapter, Decorator).

Behavioral Patterns: Manage communication and behavior (e.g., Observer, Strategy).

Common Design Patterns Explained

1. Singleton Pattern

Ensures a class has only one instance and provides a global access point to it.// Singleton in Java public class Database { private static Database instance; private Database() {} public static Database getInstance() { if (instance == null) { instance = new Database(); } return instance; } }

2. Factory Pattern

Creates objects without exposing the instantiation logic to the client.// Factory Example in Python class ShapeFactory: def get_shape(self, type): if type == 'circle': return Circle() elif type == 'square': return Square()

3. Observer Pattern

Defines a one-to-many dependency so that when one object changes state, all its dependents are notified.

4. Strategy Pattern

Allows algorithms to be selected at runtime by defining a family of interchangeable behaviors.

5. Decorator Pattern

Adds new functionality to objects dynamically without changing their structure.

Best Practices for Learning Design Patterns

Start with the basics: Singleton, Factory, and Observer.

Understand the problem each pattern solves.

Use real-world examples to grasp each pattern.

Refactor your existing code using design patterns where applicable.

Don't force patterns—use them where they naturally fit.

Resources for Learning

Refactoring Guru – Visual and code-based examples.

SourceMaking – Classic explanations.

Java Design Patterns GitHub Repo

Book: Design Patterns: Elements of Reusable Object-Oriented Software by the "Gang of Four".

Conclusion

Design patterns are a powerful tool for developers at all levels. They provide a structured approach to solving common programming problems and help build applications that are easier to manage and extend. Start small, practice often, and soon you'll be writing better code with confidence.

[subb01]

Key Concepts to Review Before Your Java Interview

Java interviews can be both challenging and rewarding, often acting as a gateway to exciting roles in software development. Whether you're applying for an entry-level position or an advanced role, being well-prepared with core concepts is essential. In this guide, we’ll cover key topics to review before your Java interview, ensuring you're confident and ready to impress. Additionally, don't forget to check out this detailed video guide to strengthen your preparation with visual explanations and code demonstrations.

1. Object-Oriented Programming (OOP) Concepts

Java is known for its robust implementation of OOP principles. Before your interview, make sure to have a firm grasp on:

Classes and Objects: Understand how to create and use objects.

Inheritance: Review how subclasses inherit from superclasses, and when to use inheritance.

Polymorphism: Know the difference between compile-time (method overloading) and runtime polymorphism (method overriding).

Abstraction and Encapsulation: Be prepared to explain how and why they are used in Java.

Interview Tip: Be ready to provide examples of how you’ve used these concepts in your projects or coding exercises.

2. Core Java Concepts

In addition to OOP, there are foundational Java topics you need to master:

Data Types and Variables: Understand primitive types (int, double, char, etc.) and how they differ from non-primitive types.

Control Structures: Revise loops (for, while, do-while), conditional statements (if-else, switch-case), and how they control program flow.

Exception Handling: Know how try, catch, finally, and custom exceptions are used to manage errors in Java.

Collections Framework: Familiarize yourself with classes such as ArrayList, HashSet, HashMap, and their interfaces (List, Set, Map).

Interview Tip: Be prepared to discuss the time and space complexities of different collection types.

3. Java Memory Management

Understanding how Java manages memory can set you apart from other candidates:

Heap vs. Stack Memory: Explain the difference and how Java allocates memory.

Garbage Collection: Understand how it works and how to manage memory leaks.

Memory Leaks: Be prepared to discuss common scenarios where memory leaks may occur and how to avoid them.

Interview Tip: You may be asked how to optimize code for better memory management or to explain how Java’s finalize() method works.

4. Multithreading and Concurrency

With modern applications requiring multi-threading for efficient performance, expect questions on:

Threads and the Runnable Interface: Know how to create and run threads.

Thread Lifecycle: Be aware of thread states and what happens during transitions (e.g., from NEW to RUNNABLE).

Synchronization and Deadlocks: Understand how to use synchronized methods and blocks to manage concurrent access, and how deadlocks occur.

Concurrency Utilities: Review tools like ExecutorService, CountDownLatch, and Semaphore.

Interview Tip: Practice writing simple programs demonstrating thread synchronization and handling race conditions.

5. Java 8 Features and Beyond

Many companies expect candidates to be familiar with Java’s evolution, especially from Java 8 onward:

Lambda Expressions: Know how to write concise code with functional programming.

Streams API: Understand how to use streams for data manipulation and processing.

Optional Class: Learn to use Optional for handling null checks effectively.

Date and Time API: Review java.time package for managing date and time operations.

Interview Tip: Be prepared to solve coding problems using Java 8 features to show you’re up-to-date with recent enhancements.

6. Design Patterns

Java interviews often include questions on how to write clean, efficient, and scalable code:

Singleton Pattern: Know how to implement and when to use it.

Factory Pattern: Understand the basics of creating objects without specifying their exact class.

Observer Pattern: Be familiar with the publish-subscribe mechanism.

Decorator and Strategy Patterns: Understand their practical uses.

Interview Tip: Have examples ready that demonstrate how you’ve used these patterns in your projects.

7. Commonly Asked Coding Problems

Prepare by solving coding problems related to:

String Manipulations: Reverse a string, find duplicates, and check for anagrams.

Array Operations: Find the largest/smallest element, rotate arrays, or merge two sorted arrays.

Linked List Questions: Implement basic operations such as reversal, detecting cycles, and finding the middle element.

Sorting and Searching Algorithms: Review quicksort, mergesort, and binary search implementations.

Interview Tip: Practice on platforms like LeetCode or HackerRank to improve your problem-solving skills under time constraints.

Final Preparation Tips

Mock Interviews: Conduct practice interviews with peers or mentors.

Review Your Code: Ensure your past projects and code snippets are polished and ready to discuss.

Brush Up on Basics: Don’t forget to revise simple concepts, as interviews can include questions on any level of difficulty.

For more in-depth preparation, watch this helpful video that provides practical examples and coding tips to boost your confidence.

With these concepts in mind, you'll be well-equipped to handle any Java interview with poise. Good luck!

[codeonedigest]

The Decorator Pattern Tutorial with Java Example You've Been Waiting For | Compare it with Strategy Pattern

Full Video link https://youtu.be/CJ-EDREomJ0 Hello friends, #Decoratorpattern video in #JavaDesignPatterns is published on #codeonedigest #youtube channel. This video covers topics 1. What is #Decoratordesignpattern? 2. What is the use of Decorator #de

Decorator design pattern is to allow additional responsibility to object at the run time. Use Decorator pattern whenever sub-classing is not possible. Decorator pattern provides more flexibility than static inheritance. Decorator pattern simplifies the coding. Decorator design pattern allows the extension of object by adding new classes for new behavior or responsibility. Decorator pattern is a…

[prettylittleflowerx]

Affordable Interior Home Improvement Ideas

Searching for some simple interior home improvement ideas that may enhance the appearance of your house without huge expenses? We've got some inexpensive ideas for you.

Why Update?

So you've lived in your home for a couple of years and its showing wear and tear. There are a great deal of home improvement ideas which you can do inside your home that do not cost much money; that is if you do them yourself. It's far cheaper to do what enhancements you can by yourself. These improvements could even enhance the value of your home so that it's well worth looking into them.

Wet Paint

Painting the interior of your home is something you can do very easily. Matte-finished paint is very simple to paint with. Your regional home-improvement shop can fill you in on what supplies you require. It may even teach you what materials you need and the processes you want to go through to successfully paint your interior walls. You might even learn how to perform stenciling or other decorative techniques.

Curtain Call

You may replace your old, faded curtains with bright new ones at a minimal price. Hit the deal stores for these rather than the high price stores however. Remember you are attempting to keep everything as cheap as possible. 

Kitchen Duty

Kitchen responsibility involves brightening up the kitchen you've got. You only have to replace the cabinet doors with new ones if they're too badly aged. Another way to brighten them up is to paint them. When they have a protective finish on them it will need to be eliminated first through sanding or stripping. Then all you've got to do is use a great quality high-gloss or satin-finish paint to lift their appearance. Also replace the knobs with fresh ones. Do not overlook the drawers either.

Clean the Carpets

Simply shampooing the carpets will work wonders for your entire house. Carpets have a means of being stained and grungy looking if not cleaned periodically. We walk all day without realizing we're grounding in dirt that dims the colour of the carpet. It is possible to rent shampooers or do it professionally; either way is an inexpensive investment in your property.

Shine the Floors

For those who have hardwood flooring gently clean them and if they have a finish on them you might have to strip and then redo the flooring. In the event that you have tile flooring though examine the flooring to see if there are cracked tiles that the need replacing. If you're able to still get that exact same style of tile the majority of the time that the broken ones can easily be replaced. You may want an expert for this job if you aren't handy with your hands.

Basking in the Bathroom

You want to have the ability to appreciate your bathrooms. What's fun about taking a look at a whole lot of worn out fixtures however? Replace these unsightly fittings with shiny new ones. These too can be substituted or in certain cases resurfaced. This may cost you a bit for the bathtub but a sink or bathroom isn't that big of an expense.

Doing the above mentioned improvements is quite reasonably priced and well worth doing for the appearance and value of your dwelling.

Home Improvement Ideas: The 10 Most Worth It

Summarized below are 10 home improvement ideas that may make your area more effective and more enjoyable filled than ever. Here are those:

1. Kitchen Remodelling

Kitchen upgrade not only increases your home's buying value, but also its aesthetic allure. A light green tile backsplash, by way of instance, helps emphasize your simple white wood cabinetry or white marble ledges. When there's a modern feel to your rooms, then you can select from clear natural colours to bold tiles, such as red or orange. Colorful recycled glass tiles, on the other hand, can result in a classic room's pragmatic feel. Generally speaking, coupled with other remodelling ideas, the final output is dazzling, yet not exaggerated, balancing the last design of your dwelling.

2. Roof Replacement

Given the broad variety of roofing types and materials you can choose from, roof replacement may invariably alter the personality and the vibe of your dwelling. By way of instance, if you would like a natural texture to your roof, you can select natural thin layers of slate. If, on the other hand, you want an energy efficient and a fire resistant roof that comes in designer colors, a metal roof is a good idea. Actually, there are quite a few other options aside from these. But all in all, all roofing materials and types can increase your home's appeal, besides it shielding you from catastrophes.

3. Deck Addition

Deck addition can increase the value of your home, it may also make it a more desirable area to go home to, after school or after work. I mean, there is nothing like relaxing on a deck, enjoying the view with a hot or cool beverage in your hand, right?

4. Bathroom Remodelling

Bathrooms are more than merely a utilitarian area in your house, since you are able to place many spins on it. There are lots of available bathroom systems it is possible to choose from. By way of example, you can put in a bathroom system using a walk-in bathtub which will make it possible for you to go into the bathtub with much simplicity, without needing to measure over the awkward barrier of a conventional tub, which may cause you to slip or fall off. Apart from that, many other striking alternatives are readily available. You could even add taps and mirrors, and then paint it to freshen it. In any case, building a better toilet, to make an perfect at-home oasis, is officially needed.

5. Reinventing a Room

You can reinvent your space by turning any unoccupied spaces in your house, such as your attic and your own bathrooms, and convert it into a bedroom, a living area, or a game room instead. In this manner, you can maximize your home's space, and also its worth.

6. Establish a Backyard Patio

Having a backyard terrace, you can get cozy and intimate gatherings with your nearest and dearest, without needing to go outside and spend lavishly. All the more, you might have a cool place in your home, where you are able to enjoy your java in the morning and at night. That would truly be a relaxing place to visit.

7. Basement Waterproofing

Basement waterproofing, so to speak, eliminates mould, and base and wall problems within your dwelling. Not just that, it may also prevent seepage and function as a vapor barrier. These benefits speak for themselves, as to why cellar waterproofing is a home improvement option to take under account.

8. Update your Yard

The front lawn is a vital component to accentuate your home's curb appeal. By upgrading your front lawn, you can enhance your home's flow. Moreover, you can strategically place trees, which may help decorate your lawn, help shade your home from heat, block cold winds during winter, and thereby reduces cooling costs. Consequently, adding some hanging baskets, flower pot, plus trimming hedges and lawns, can definitely create a welcoming impression.

9. Attic Remodelling

Exactly as with other empty spaces in your house, attics may also be turned into a possible functional space, if revived properly and designed more creatively. It could be turned into an office area, a home theater, a reading area, or a sport area. To put it simply, you can feel more at ease and alleviated with the cold breeze and the quiet night on your attic.

10. Make Your Home Exterior Pop

Color plays a important role in fostering your home's curb appeal. It can make your house either stick out from the pack or blend in pleasantly with the environment. To create your home's exterior pop, you can pattern the color of your roof's shingles following the designs you used in your dwelling. By way of instance, higher contrast colors accentuate your roofs' finest characteristics, while low contrast colors tend to hide its flaws. Moreover, beside the shingles, you may also make it pop by buying a front door entrance, that's the home feature that delivers the most adaptability in color choices.

[cooperhewitt]

Cinderella Goes Batik

Title page illustration.

At the Cooper Hewitt Museum the study and teaching of design includes learning about the materials and techniques used in designing objects, textiles, and works on paper. The Cooper Hewitt Museum Library collection supports research into the study of design with books that demonstrate and document techniques and materials, the “how to” and “with what” of decorative arts and design.

Cinderella’s newly made and designed batik ballgown.

In writing an instructional book using the old fairy story of Cinderella, Jessie M. King (Scottish, 1875- 1949) wanted to “awaken your imagination to that point where you want to look further into the wonderland of “BATIK.”  This is a wax resist dyeing technique to create patterns and designs for textiles.

Tools needed to create a batik.

In King’s story, three sisters are invited to the annual Midsummer’s Eve dance but there are only two ball gowns available and neither one would fit Cinderella. In their attic is an old chest that is full of “BATIK”, left by her faerie godmother who had gone to live in Java for a time. While Cinderella cries over missing the ball, the godmother appears and finds a solution; they will re-use an old white silk frock. Cinderella is sent out to find some beeswax and onions. The godmother paints different flowers with the wax on the silk, pointing out that the designs she is painting are all from the flowers in the garden. The patterns and colors you can create are everywhere in nature. Cinderella, who watches and joins in the carefully explained batik design technique and dying process, now has a beautiful saffron yellow dress to wear to the ball. At the happy ending of the fairy tale, the godmother rattled off the following list to Cinderella: “Beeswax, brushes, newspapers, irons…PATIENCE…,”she then wagged her finger roguishly at her godchild, “…and a SENSE OF DESIGN.”  In “Exit the Fairies,” Jessie King gives the reader more basic advice and ideas for the applications of the art of batik in textiles.

An example of a batik technique tunic.

Jessie M. King is best known for her drawings in the Art Nouveau style (more particularly the Glasgow School), but she also designed jewelry, greeting cards, fabric, ceramics and batik textiles, and especially, murals.

      Elizabeth Broman is the Reference Librarian, Cooper Hewitt, Smithsonian Design Library.

from Cooper Hewitt, Smithsonian Design Museum https://ift.tt/2OrVbSB via IFTTT

[gwen-chan]

[WRITER AVAILABLE] Need to write a java code using Observer design Patterns. There is one example i

[WRITER AVAILABLE] Need to write a java code using Observer design Patterns. There is one example i

Need to write a java code using Observer design Patterns. There is one example in the text book. Refer that one. I will attach the text book below. Read pages 1 through 108 (intro, observer, decorator sections ) as an introduction to design patterns and meet your first design patterns.

[gritvan]

[WRITER AVAILABLE] Need to write a java code using Observer design Patterns. There is one example i

[WRITER AVAILABLE] Need to write a java code using Observer design Patterns. There is one example i

Need to write a java code using Observer design Patterns. There is one example in the text book. Refer that one. I will attach the text book below. Read pages 1 through 108 (intro, observer, decorator sections ) as an introduction to design patterns and meet your first design patterns.

[fatherlongboy]

Top Five Home Improvement Ideas for Spring

A home is a private place where we feel free to act ourselves. Just about all people desire for a dream house. We hope our houses should be cosy, welcoming and tranquil. This is the reason almost all people are interested in home improvement. We like to design our inside in such a subtle way that it looks appealing and visually attractive.

Spring is the most colourful and appealing seasons. We always long for this. This is the reason you should designs your house so to welcome and celebrate the season.

If you would like to show yourself a man of refined taste, you should have great home improvement ideas. You can't do this quite well, unless you've got innovative interior design ideas. Before reaching your inside, it's much better to begin with the exterior. Once it's completed, you can go for the next step, your interior design. Revamp your house with some cleaning and reorganizing functions to give it a substantial facelift.

In this Report we will discuss on five effective home Improvement Tips for spring

• Clean out the mess by eliminating the rubbish accumulated during the last couple of months in your backyard or garden. Clear your garden and the open patio in front of your property. Beautify them with lovely green plants. Open up the curtains. Let some sun and fresh air come to the chambers. Remove all the additional stuff lying around.

• Clean up your doorsteps. Go Green with a few new plants, and shrubs. A set of vibrant blooms will do all of the good. Remove the old, ill and dusty plants. Prone your greenery regularly to provide them symmetrical shapes.

• Spring is the season of colours and you will need to do some justice to the time by choosing for as much colour as possible. Uplift the appearance of the interiors of your home by placing some brightly colored flower plants in some certain points.

• look after your flooring and update your spring rugs. You can find an attractive carpet of bright and contrasting colors, which will'go' with the colors of your furniture, wood panels, curtains and other accessories. It can allow you to make an impressive ambience.

• Assess your accessories and wall decor. Look around your room. See if there's a need of revamping or refurbishing. If so, then opt for a few innovative wallpapers and smart paintings. However, you want to keep a balance. Don't overcrowd the rooms with paintings or photographs. Bring a number of changes from the accessories to give your house a different look.

Home Improvement Ideas: The 10 Most Worth It

Summarized below are 10 home improvement ideas that may make your area more effective and more enjoyable filled than ever. Here are those:

1. Kitchen Remodelling

Kitchen update not only increases your home's buying value, but its aesthetic appeal. 1 way to remodel your kitchen is to use tile backsplashes, which is a stylistic way of spicing up your kitchen interiors. A light green tile backsplash, by way of instance, helps emphasize your simple white wood cabinetry or white marble ledges. When there's a modern feel to your rooms, then you can select from clear natural colours to bold tiles, such as red or orange. Colorful recycled glass tiles, on the other hand, can result in a classic room's pragmatic feel. Generally speaking, coupled with other remodeling thoughts, the final outcome is dazzling, yet not exaggerated, balancing the last design of your dwelling.

2. Roof Replacement

Given the broad variety of roofing types and materials you can choose from, roof replacement may invariably alter the personality and the vibe of your dwelling. By way of instance, if you would like a natural texture to your roof, you can select natural thin layers of slate. If, on the other hand, you want an energy efficient and a fire resistant roof that comes in designer colors, a metal roof is a good idea. Actually, there are quite a few other options aside from these. But all in all, all roofing materials and types can increase your home's appeal, besides it shielding you from catastrophes.

3. Deck Addition

Deck addition can increase the value of your home, it may also make it a more desirable area to go home to, after school or after work. 

4. Bathroom Remodelling

Bathrooms are more than merely a utilitarian area in your house, since you are able to place many spins on it. There are lots of available bathroom systems it is possible to choose from. By way of example, you can put in a bathroom system using a walk-in bathtub which will make it possible for you to go into the bathtub with much simplicity, without needing to measure over the awkward barrier of a conventional tub, which may cause you to slip or fall off. Apart from that, many other striking alternatives are readily available. You could even add taps and mirrors, and then paint it to freshen it. In any case, building a better toilet, to make an perfect at-home oasis, is officially needed.

5. Reinventing a Room

You can reinvent your space by turning any unoccupied spaces in your house, such as your attic and your own bathrooms, and convert it into a bedroom, a living area, or a game room instead. In this manner, you can maximize your home's space, and also its worth.

6. Establish a Backyard Patio

Having a backyard terrace, you can get cozy and intimate gatherings with your nearest and dearest, without needing to go outside and spend lavishly. All the more, you might have a cool place in your home, where you are able to enjoy your java in the morning and at night. That would truly be a relaxing place to visit.

7. Basement Waterproofing

Basement waterproofing, so to speak, eliminates mould, and base and wall problems within your dwelling. Not just that, it may also prevent seepage and function as a vapor barrier. These benefits speak for themselves, as to why cellar waterproofing is a home improvement option to take under account.

8. Update your Yard

The front lawn is a vital component to accentuate your home's curb appeal. By upgrading your front lawn, you can enhance your home's flow. Moreover, you can strategically place trees, that can help decorate your lawn, help shade your home from heat, block cold winds during winter, and thus reduces heating costs. Consequently, adding some hanging baskets, flower pot, plus trimming hedges and lawns, can definitely create a welcoming impression.

9. Attic Remodelling

Exactly as with other empty spaces in your house, attics may also be turned into a possible functional space, if revived properly and designed more creatively. It could be turned into an office area, a home theater, a reading area, or a sport area. To put it simply, you can feel more at ease and alleviated with the cold breeze and the quiet night on your attic.

10. Make Your Home Exterior Pop

Color plays a important role in fostering your home's curb appeal. It can make your house either stick out from the pack or blend in pleasantly with the environment. To create your home's exterior pop, you can pattern the color of your roof's shingles following the designs you used in your dwelling. By way of instance, higher contrast colors accentuate your roofs' finest characteristics, while low contrast colors tend to hide its flaws. Moreover, beside the shingles, you may likewise make it pop by investing on a front door entrance, that's the home feature that delivers the most adaptability in color choices.

[123designsrq]

MULTIFUNCTIONAL STOOLS INSPIRED BY MINIMALIST JAPANESE NESTING PUZZLES

There’s something about Japanese-inspired designs that instantly calm you lower, and wash you over and done with a feeling of peace. They always have the ability to the simple, minimal, and complicated. For this reason they always get me excited! One particular example could be the Multifunctional Stools. Inspired by traditional Japanese Shinto Kumiki puzzles, this set of nesting stools feature the Yosegi technique, the art of making exquisite patterns using inlaid wood. You will see that the Tsugite technique was even utilized, including getting together geometric wooden joints, leading to 12 gemstone-formed posts that effortlessly merge together. Because of these wooden joints and different posts, both stools could be used together to produce one space-saving stool! This space-saver can be simply set aside for storage. When separated in 2, additionally they work as companion seats or footrests. Constructed from Japanese Hinoki Cypress and Jindai Cedar plank, the stools showcase diverse warm tones of wood, flittering from more dark browns to lighter coffee hues. Uniting just like a puzzle, the Yosegi Stools function as minimal and classic decorative pieces, besides their seating functionality. The seamlessness that the Multifunctional Stools fit together as well as their unique geometric structure causes it to be no real surprise they won the Gold A’ Design Award in 2018. There exists a large amount of item and style of Japanese Stool or Shower Stool. Bamboo, suar wood and lychee wood is really a natural material that may be easily cut and formed. It’s provides you with the opportunity to make all kinds of tables. For example, you may make some form of wood logs, or possibly create some interesting shape from wood slices. Alas gembol is furniture manufacturer and export company situated in Java Indonesia, in which the largest teak plantation on the planet located. We've export permit and v-legal wood certificate. japanese low stool japanese stool design japanese stool plans japanese folding stool japanese meditation stool japanese bar stool japanese step stool antique japanese stool Read the full article

[codeonedigest]

The Decorator Pattern Tutorial with Java Example You've Been Waiting For..

The Decorator Pattern Tutorial with Java Example You’ve Been Waiting For..

Decorator design pattern is to allow additional responsibility to object at the run time. Use Decorator pattern whenever sub-classing is not possible. Decorator pattern provides more flexibility than static inheritance. Decorator pattern simplifies the coding. Decorator design pattern allows the extension of object by adding new classes for new behavior or responsibility. Decorator pattern is a…

[udemy-gift-coupon-blog]

Game Development (Android + IOS): Build 12 Apps & Games ##FutureLearn ##UdemyFreeDiscountCoupons #Android #Apps #Build #Development #Game #Games #iOS Game Development (Android + IOS): Build 12 Apps & Games Welcome to Python Programming world: most popular language skill to have in 2018. You are going to learn every bit of python language in this course so that you can apply your knowledge in real world apps. You will learn: 1. Android game and app development with Kivy+Python 2. Python basics and advance 3. Important pygame module Questions that most beginners ask me :  Is Python A Good First Programming Language To Learn? Even though it has not yet been adopted as a first language by many computer science programs, Python is widely seen by industry experts as a great first programming language when learning to code and its extensive use in SpaceX  to automate and handle technologies to launch rockets, Instagram, Google to support their backends and Many companies to support and execute ML and Deep Learning Algorithms; Its undoubtedly No.1 Programming Language to learn. For starters, the syntax of Python is simpler than that of most other major programming languages, with fewer exceptions and special cases. It also tends to use plain English keywords in place of the system of punctuation that has to be memorized in other languages, making it easier to learn to code. Given these conventions, Python code tends to appear as less of a "jumble" to newcomers than it does in comparable languages. Another great feature of Python is the ubiquity of its use. While Python is optimized for development on Linux and Unix systems, interpreters are available for just about every major operating system. All implementations of Python are supported by an excellent standard library, which means that new students can very quickly move on to creating actual functional programs that are useful. Additionally, the standard implementation of Python, CPython, is free and open source. What Type Of Jobs Are Available To Python Programmers?  In the job market, if you observe the trends; Python is often looked as a strong language to support some  primary language that is more broadly used like C or Java. But Lately, with the evolution of ML and Deep Learning Algorithms; it is highly demanded skill to have in 2018 and later. There are a variety of jobs that one can get focusing exclusively on Python development, however. Many of these jobs will be in building and improving the internal tools that a company uses to create its finished marketable products, rather than working on the finished product itself. One specific economic sector where the presence of Python programming is particularly strong is the geospatial industry. This is a critical industry that deals in navigational tools such as GPS, radar and light measurements. If you're interested in web applications, Python is a better choice for development (working with the back-end or server side) rather than design (creating the actual finished front-end that site visitors interact with). As mentioned previously, Google employed Python for many components of its search engine, and it is quite widely used in the data mining industry. Finally, Python can also be used for game development. Some famous examples of games developed either entirely or in large part with Python include EVE Online, Civilization IV, the Battlefield game series and the Mount & Blade games. The popular development environment Blender is written in Python. TOPICS TO BE COVERED IN THIS COURSE: Installing Python Running Python Code Strings Lists  Dictionaries Tuples Sets Number Data Types Print Formatting Functions Scope args/kwargs Built-in Functions Debugging and Error Handling Modules External Modules Object Oriented Programming Inheritance Polymorphism Encapsulation Advanced Methods Copy Module Decorators Iterators Android development with Kivy Closures and much more! PROJECTS   Minor Projects (Basic to advance): Password generator Domain Formatting Star Pattern Stop timer Tic Tac Toe Simple word count Scientific calculator Rock Paper Scissors Credit card Validator Punctuation removal Major Projects: Flappy Bird 2048 game Who this course is for: Anyone who wants to learn coding through game development Anyone who wants to learn coding for their academics Anyone who wants to learn Python to excel their carrer in Machine Learning and Data Science 👉 Activate Udemy Coupon 👈 Free Tutorials Udemy Review Real Discount Udemy Free Courses Udemy Coupon Udemy Francais Coupon Udemy gratuit Coursera and Edx ELearningFree Course Free Online Training Udemy Udemy Free Coupons Udemy Free Discount Coupons Udemy Online Course Udemy Online Training 100% FREE Udemy Discount Coupons https://www.couponudemy.com/blog/game-development-android-ios-build-12-apps-games-2/

[nikolinaboldero]

Liberty’s London Independent Study Visit.

16/11/18

Liberty’s London is known for its luxury goods, covering everything from fashion to cosmetics and then to interior design. It is particularly recognised for its graphic and floral prints. Liberty has played a major role in the development of new artistic styles, such as the arts and craft movement, art noveau. His father gave him a loan of 2,000 pounds in order for Arthur Lasneby Liberty to open up the shop on Regent Street, it officially opened in 1875 and had three employees. Naming the store as the ‘East India house’ his collection of fabrics, ornaments and objects from the Far East proved irresistible to a society who at the time was intoxicated by the East (orientalist fervour).

 The Grade II-listed iconic mock-Tudor store known today was built in 1924, seven years after Liberty died and was constructed with the timbers of two ships- HMS Hindustan and HMS Impreganble. Arthur died in 1917, seven years before his successors at Liberty realised his dream of docking a ship in the streets of London. The store on Great Marlborough Street was constructed from the timbers of two decommissioned Royal Navy Ships. HMS Impregnable was built from more than 3,000 100-year-old New Forest oaks. The second was the HMS Hindustan, a huge ship which is said to have matched the store it contributed to building in height and length. Also in the department store, there is an old staircase which pays tribute to the Liberty staff who lost their lives fighting in the Second World War for different kind of liberty- freedom from the regimes of the Axis powers. Liberty’s nautical theme continues in the weathervane, a gold coloured ship which sits above the entrance on Great Marlborough Street. The weathervane is a replica of The Mayflower, which transported Pilgrims to the New World in 1620. All of these features link the building to its profound history. Whenever I walk into Liberty’s I am so amazed by the decoration and the beautiful structure of the department store. I don’t go in there to shop instead I just gather visual inspiration. Liberty’s carries an experience, tells a story, this is what makes it so different to other department stores. Straight away you can picture the cultural collaborations, such as print designs taken from Java or India. (Liberty’s was also the first department store where women could visit and shop independently, away from their husbands).

 Liberty London is widely regarded as one of the best and most luxurious shopping experiences in the capital. Oscar Wilde called it ‘the chosen resort of the artistic shopper’. The reason why Liberty’s is so well known is because of its cultural relationships/connections with other countries across the globe, its rich heritage has made Liberty’s a beautiful and interesting destination to discover. Liberty’s is very true to itself, it is unique and not trying to accommodate for the growing consumer demand, it has managed to be so extremely successful without involving high street brands in their fashion departments. It does have sections dedicated to brands like Erdem and Ganni, but each section still blends in with the Liberty’s surroundings/environment. In contrast, there is Selfridges another department store in London which is very popular. This store has become lost in high street fashion.

 ‘The Arts and Craft Movement of the late 19th century was one of the most influential artistic movements in modern British history’. A major social reform, rejecting modernity in favour of a romantic revival of medieval and folk aesthetics and traditional techniques’. Art Critic John Ruskin did not believe modernity in terms of globalization, new international division of labour and mass production was having a positive impact on fashion and textiles. He praised gothic architecture, whose roughness was evidence of the craftsman’s personality and freedom. Ruskin’s ideas were hugely influential to the social activist William Morris. By the 1880s Morris was a well-known figure, ‘his designs the height of fashion, and the wider Arts and Craft Movement was born. Liberty London dealt in goods favoured by his style.

 Simple elements from the heart of the brand’s heritage are constantly looked at, reviewed, for example they created a new and more vivid Liberty purple; the famous crest redrawn and the identity was refreshed to express the core elements of the brand more powerfully. This is how they continue to build heritage into the brand name. Liberty is famous for its range of signature fabrics. The brand looks at their huge archive of prints, to carry on unleashing powerful, instantly recognisable clothes for marketing and communications campaigns. The ‘Liberty London’ name was applied across both the store and product brands for added consistency, creating a brand architecture and naming certain conventions than work with partner brands like Hermes or Target.

Liberty Fabrics and Print- collection

The ‘East India House’ (1875) sold Oriental imports- namely rugs, decorative objects and fabrics. After several years the East India House grew and demand for their beautiful fabrics increased. It was at this time that Liberty’s decided to import undyed fabrics and have them hand printed in England in the style of Oriental prints. At this moment in time, Liberty’s started marketing their own fabrics as ‘Made in England’.

1920s- Liberty’s designed prints with miniature floral and paisley designs.

Tana Lawn cotton is the most popular of all the fabric selection in liberty’s, the material is very lightweight therefore it is suitable to be used for dresses, blouses, shirts and skirts.

 I personally think that you can get quite a variety of people shopping in Liberty’s because it has a collection of items, ranging from for example fashion to interiors. It sells a lot of luxury goods therefore it does exclude some of the population who cannot afford to shop here. Those who like high street fashion/high street shopping are not likely to shop in Liberty’s London, they will shop in the more modern department stores like Selfridges. Liberty’s does not just attract the shoppers, people also visit the department store because of its rich history and store heritage. Oscar wild- ‘the chosen resort of the artistic shopper’- I go to the store to study the fashion garments, their beautiful pieces sourced from their archive, I look at the interior design and textiles all for inspiration.

Fashion raincoat by Ganni. Modern representation of textiles in Libertys. ‘GANNI has developed exponentially over recent years with its Scandi 2.0 sense of style full of personality and contrasts. Based in Copenhagen and owned and run since 2009 by husband and wife team Ditte Reffstrup and Nicolaj Reffstrup.

 ‘We sought after a more playful and effortless approach to design, that represents how I want to dress and look. Without strict dogmas or rules, but with room for personality, contrasts and experimentations’.

 The company is based in Copenhagen and I believe that a lot of the designing and production happens here. They have mentioned in one of their interviews online that they get inspiration from the area and the cool Copenhagen girls. The material of this coat is very similar to PVC fabric, although it is a lot softer and more flexible. The material is loose and adjusts to the female figure. On top of the material there are some flowers which have been printed on. The flowers have been made to look quite graphic, like a picture, they have a similar appearance to a water coloured painting of a flower. I really like this fashion garment because it stands out from the other designs in the fashion department. It was an example of a piece which you wouldn’t find in high street department stores, like Selfridges, therefore making it original to liberty’s. It is beautiful, I love the reflective appearance on the coat and the quality of the material. It shows a clear example of how improvements in technology (innovation) have allowed for more creative approaches to producing garments. In the store, the piece was just hung up on a rail. I think that fashion designers are more likely to buy this piece of clothing, it is a statement piece as opposed to being used for everyday use. It is also 240 pounds therefore it is not for anyone to wear. The raincoat reminded me of my final collection at the end of the 2 years of A level. I made a raincoat, enmeshing petals in between two layers of PVC fabric. Here are some images below of the garment.

 In the warehouse in Hayford there is a selection of Liberty prints and sketches. The warehouse is packed with oversized books, labelled boxes and preserved paintings, the rooms are all guarded by the archive department who have the important task of ensuring every design, ranging from the Tana Lawn to the silk satin, is documented with information and stored in the database. The 1880s was when Liberty started producing their own pattern books. There are around 40, 000 prints held in the archive. In the archive, the textile materials are kept away from any form of dust and light in acid-free boxes as much as possible. The artwork is stored in these things called melanex sleeves. Libertys has a good relationship with the paper conservation course at Camberwell College of Arts. ‘Tana Lawn’ is one of Liberty's most well known and loved fabrics, with the name originating from Lake Tana in East Africa, where the original cotton grew. This classic print is made from ultra-fine long staple cotton and without the use of crease-resisting chemicals or irritating allergens. With fabric technology at the forefront, the end result offers an iconic look and soft touch’.

Images of my own design- fashion garment from 2018 winter collection. 

[ageloire]

The Beginner's Guide to Design Patterns

To fully understand the importance of design patterns, let's start with an example -- when a user uses your product, how do they save their landing page, blog post, template, etc.? Do their projects auto-save, or do they need to press a "Save" button?

Let's say you choose auto-save. Great. Now, how much time do you have? Do you want to go into each individual page and code for the auto-save component, with a big potential for error?

Or do you want to use a design pattern to ensure each of your website pages saves the same way, without tedious effort on your part?

That's the value of design patterns.

Here, we'll explain what design patterns are, and provide lists of design patterns in Java, C# and .Net, so you can save valuable time and effort on your next design project.

Design patterns explained simply

At its most basic, design patterns are solutions to recurring problems.

In the UX world, then, a design pattern is a pre-prescribed solution to a common design problem. Essentially, it's a way of saying, "Here's how we typically solve for this problem, if you want to use our method."

Chelsea Bathurst, a Design Lead at HubSpot, puts it this way: "Basically, components are the foundation -- how does this thing look. Design patterns are how they work together."

Design patterns are undeniably useful. They allow designers to avoid "re-inventing the wheel", and because they are tried-and-true solutions from experienced designers, they are less risky than creating something from scratch.

There are three types of design patterns: 

Creational design patterns: Regarding object creation mechanisms

Structural design patterns: Regarding Class and Object composition -- identifying relationships and patterns between components

Behavioral design patterns: Identifying communication patterns between Class objects

Next, let's take a look at our lists of design patterns in java, or C# and .NET, so you can begin applying them yourself. 

Design patterns in Java

Factory Pattern

Abstract Factory Pattern

Singleton Pattern

Prototype Pattern

Builder Pattern

Adapter Pattern

Bridge Pattern

Composite Pattern

Decorator Pattern

Facade Pattern

Flyweight Pattern

Proxy Pattern

Chain Of Responsibility Pattern

Command Pattern

Interpreter Pattern

Iterator Pattern

Mediator Pattern

Memento Pattern

Observer Pattern

State Pattern

Strategy Pattern

Template Pattern

Visitor Pattern

Design patterns in C# and .NET

Abstract Factory Pattern

Builder Pattern

Factory Method Pattern

Prototype Pattern

Singleton Pattern

Adapter Pattern

Bridge Pattern

Composite Pattern

Decorator Pattern

Facade Pattern

Flyweight Pattern

Proxy Pattern

Chain Of Responsibility Pattern

Command Pattern

Interpreter Pattern

Iterator Pattern

Mediator Pattern

Memento Pattern

Observer Pattern

State Pattern

Strategy Pattern

Template Pattern

Visitor Pattern

Once you understand the uses of each of these design patterns, you can choose which ones will best fit your needs. However, it's critical you understand basic java, or C# and .NET programming concepts, to correctly apply these solutions. If you don't, begin by taking an introductory course before taking any next steps with these design patterns.

from Marketing https://blog.hubspot.com/marketing/design-patterns

[lewiskdavid90]

80% off #From 0 to 1: Design Patterns – 24 That Matter – In Java – $10

An intensely practical, deeply thoughtful and quirky look at 24 Design Patterns. Instructors are ex-Google, Stanford.

All Levels,  – 11.5 hours,  63 lectures 

Average rating 4.2/5 (4.2 (100 ratings) Instead of using a simple lifetime average, Udemy calculates a course’s star rating by considering a number of different factors such as the number of ratings, the age of ratings, and the likelihood of fraudulent ratings.)

Course requirements:

There are no pre-requisites other than curiosity – about Design, about Patterns, about Life

Course description:

Prerequisites: Basic understanding of Java Taught by a Stanford-educated, ex-Googler, husband-wife team More than 50 real-world examples

This is an intensely practical, deeply thoughtful, and quirky take on 24 Design Patterns that matter.

Let’s parse that.

The course is intensely practical, bursting with examples – the more important patterns have 3-6 examples each. More than 50 real-world Java examples in total. The course is deeply thoughtful, and it will coax and cajole you into thinking about the irreducible core of an idea – in the context of other patterns, overall programming idioms and evolution in usage. The course is also quirky. The examples are irreverent. Lots of little touches: repetition, zooming out so we remember the big picture, active learning with plenty of quizzes. There’s also a peppy soundtrack, and art – all shown by studies to improve cognition and recall. Lastly, the patterns matter because each of these 24 is a canonical solution to recurring problems.

What’s Covered:

Decorator, Factory, Abstract Factory, Strategy, Singleton, Adapter, Facade, Template, Iterator, MVC, Observer, Command, Composite, Builder, Chain of Responsibility, Memento, Visitor, State, Flyweight, Bridge, Mediator, Prototype, Proxy, Double-Checked Locking and Dependency Injection. The only GoF pattern not covered is the Interpreter pattern, which we felt was too specialized and too far from today’s programming idiom; instead we include an increasingly important non-GoF pattern, Dependency Injection. Examples: Java Filestreams, Reflection, XML specification of UIs, Database handlers, Comparators, Document Auto-summarization, Python Iterator classes, Tables and Charts, Threading, Media players, Lambda functions, Menus, Undo/Redo functionality, Animations, SQL Query Builders, Exception handling, Activity Logging, Immutability of Strings, Remote Method Invocation, Serializable and Cloneable, networking. Dependency Inversion, Demeter’s Law, the Open-Closed Principle, loose and tight coupling, the differences between frameworks, libraries and design patterns.

Talk to us!

Mail us about anything – anything! – and we will always reply

Full details Identify situations that call for the use of a Design Pattern Understand each of 24 Design Patterns – when, how, why and why not to use them Distill the principles that lie behind the Design Patterns, and apply these in coding and in life, whether or not a Design Pattern is needed Spot programming idioms that are actually built on Design Patterns, but that are now hiding in plain sight

Full details Yep! Engineers – from street-smart coders to wise architects – ought to take this course. After this class, you’ll look at software design with a new pair of eyes. Yep! Product Managers ought to take this course – you will learn to understand the ‘how’ of Software Design without being constrained by it. Yep! Technology executives and investors who don’t write code ought to take this course – after this you will always have an intelligent point-of-view on software, and won’t find your eyes glazing over when its time to talk nitty-gritty Computer Science majors (undergrad or grad) – if you are among the folks that make ‘real world example Observer Pattern’ such a common search phrase on Google, this is precisely the place for you. Yep! Journalists, Wall Street types or IP lawyers seeking to understand recurring patterns of problems and solutions in technology. Yep! If you are prepping hard for software engineering interviews

Nope! This course is not right for you if you are looking for a Programming 101 course. That’s not because there are pre-requisites, but simply because a Programming 101 course focuses on syntax, and on doing, while this course focuses on design, and on thinking.

Full details

Reviews:

“While it is repetitious at times, a highly thought through and very well presented course.” (Phani)

“The detailed explanations were extremely helpful to get a grip on the patterns. Especially nice was that patterns were compared and put into the context of other patterns where appropriate, and that a limited set of examples were used under different perspectives. However, in the first place I had expected to see more concrete instructions how to implement the patterns from scratch. Nevertheless, the course was really cool, thnx :)” (Markus Lommer)

“One of the best Udemy course I’ve taken! The instructors are extremely knowledgeable, they understand that design patterns are not inherently trivial at first glance, and make the effort to break things down in a way that is easily accessible.” (Maurice McFarlane)

  About Instructor:

Loony Corn

Loonycorn is us, Janani Ravi, Vitthal Srinivasan, Swetha Kolalapudi and Navdeep Singh. Between the four of us, we have studied at Stanford, IIM Ahmedabad, the IITs and have spent years (decades, actually) working in tech, in the Bay Area, New York, Singapore and Bangalore. Janani: 7 years at Google (New York, Singapore); Studied at Stanford; also worked at Flipkart and Microsoft Vitthal: Also Google (Singapore) and studied at Stanford; Flipkart, Credit Suisse and INSEAD too Swetha: Early Flipkart employee, IIM Ahmedabad and IIT Madras alum Navdeep: longtime Flipkart employee too, and IIT Guwahati alum We think we might have hit upon a neat way of teaching complicated tech courses in a funny, practical, engaging way, which is why we are so excited to be here on Udemy! We hope you will try our offerings, and think you’ll like them

Instructor Other Courses:

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[faizrashis1995]

15 Technical Core Java Interview Questions Answers for Experienced Developers

When the experience of a Java Programmer grows in the years e.g. when it goes from beginner years ( 2 to 4) to more experience or sort of senior level ( 5 to 7 years), Core Java Interview Questions also change a bit. Of course, basics like data structure, algorithms, and object-oriented programming remains the same, but types of questions will become more advanced and their answers will definitely need to be more detailed and accurate. I often receive queries about core Java questions asked to a senior developer of 5 to 6-year experience, or, sometimes, I am going for an interview of senior Java developer, what kind of questions I should expect. This sometimes puzzles me, that once you become senior, you automatically start taking part in the interview, and you should have an idea of what to expect on Interviews, but at the same time, I can understand that having an idea of questions before going on Interview, helps preparation. Of course, you are not going to get a question like the one you have faced on 2 to 3 years level Java Interviews, but It also depends on different rounds of Interviews.

 I have not seen many changes in the questions asked on the telephonic round, which almost remains the same. You will find some fact-based, some coding questions and a few tricky questions. On the other hand face-to-face, interviews have become more detailed and more tricky, especially with nasty follow-ups.

 In this article, I am going to share some 15 technical core Java Interview Questions, which I have seen asked senior and experienced developers of 4 to 6 years of experience in different interviews, mostly on telephonic rounds.  I am not posting answers as of now, but you can find answers to most of the questions on here or the Javarevisited blog.

   If you are in a hurry and actively looking for a Java Developer Job, you can also take help from some good books written to prepare you for Java J2EE interviews. Books like, Java Programming Interview Exposed covers all important topics for both core Java and Java EE interviews, which include basic Java questions, data structure and algorithms, JVM internals and GC tuning, Hibernate and Spring interview questions, JUnit ant unit testing questions, and some Java 8 stuff.

 It also covers knowledge of other JVM languages like Scala, Groovy and other platforms like Android. A perfect companion to do well in Java interviews.

 If you want to prepare more on the coding side then you can also check out Cracking the Coding Interview, which contains almost 150 programming questions and solutions from technical interviews of big tech companies like Amazon, Facebook, Google, Twitter, and Microsoft.

   15 Core Java Questions For 5 to 6 Years Experienced

All these questions have been collected from quite senior developers, which has at least 5 years of experience. They have seen these questions on different rounds of their core Java interviews, including telephonic and face-to-face rounds on different companies, mostly on Investment banks like Barclays, Morgan, RBS, and others.

  1. What is Busy Spinning? Why Should You Use It in Java?

One of the interesting multithreading question to senior Java programmers, busy spinning is a waiting strategy, in which a thread just wait in a loop, without releasing the CPU for going to sleep. This is a very advanced and specialized waiting strategy used in the high-frequency trading application when the wait time between two messages is very minimal.

 By not releasing the CPU or suspending the thread, your thread retains all the cached data and instruction, which may be lost if the thread was suspended and resumed back in a different core of CPU.

 This question is quite popular in high-frequency low latency programming domain, where programmers are trying for extremely low latency in the range of micro to milliseconds. See here more 50+ advanced thread interview questions for experienced programmers.

  core java interview questions for senior developers

    2. What is Read-Write Lock? Does ConcurrentHashMap in Java Use The ReadWrite Lock?

ReadWrite Lock is an implementation of a lock stripping technique, where two separate locks are used for reading and write operation. Since read operation doesn't modify the state of the object, it's safe to allow multiple thread access to a shared object for reading without locking, and by splitting one lock into the read and write lock, you can easily do that.

 Java provides an implementation of a read-write lock in the form of the ReentrantReadWritLock class in the java.util.concurrent.lock package. This is worth looking before you decide to write your own read-write locking implementation.

 Also, the current implementation of java.util.ConcurrentHashMap doesn't use the ReadWriteLock, instead, it divides the Map into several segments and locks them separately using different locks. This means any given time, only a portion of the ConcurrentHashMap is locked, instead of the whole Map. See how ConcurrentHashMap internally works in Java for more detail.

  This core Java question is also very popular on senior and more experienced level Java interviews e.g. 4 to 6 years, where you expect Interviewer to go into more detail, like by asking you to provide an implementation of the read-write lock with different policies. If you are an experienced Java programmer, consider reading Java Concurrency in Practice to gain more confidence about multithreading and concurrency in Java.

    3. How to Make an Object Immutable in Java? Why Should You Make an Object Immutable?

Well, Immutability offers several advantages including thread-safety, ability to cache and result in a more readable multithreading code. See here to learn how to make objects Immutable. Once again, this question can also go into more detail and depending on your answer, can bring several other questions e.g. when you mention Spring is Immutable, be ready with some reasons on Why String is Immutable in Java.

   4. Which Design Patterns have You Used in Your Java Project?

Always expect some design patterns related question for Core Java Interview of senior developer position. It's a better strategy to mention any GOF design pattern rather than Singleton or MVC, which almost every other Java developer use it.

 Your best bet can be a Decorator pattern or maybe Dependency Injection Pattern, which is quite popular in the Spring Framework. It's also good to mention only the design patterns which you have actually used in your project and knows it's tradeoffs.

 It's common that once you mention a particular design pattern say Factory or Abstract Factory, Interviewer's next question would be, have you used this pattern in your project? So be ready with proper examples and why you choose a particular pattern. You can also see this article for more advanced design pattern questions from Java interviews.

    5.  Do you know about Open Closed Design Principle or Liskov Substitution Principle?

Design patterns are based on object-oriented design principles, which I strongly felt every object-oriented developer and the programmer should know, or, at least, have a basic idea of what are these principles and how they help you to write better object-oriented code. I

 f you don't know the answer to this question, you can politely say No, as it's not expected from you to know the answer to every question, but by answering this question, you can make your claim stronger as many experienced developers fail to answer basic questions like this. See Clean Code learn more about object-oriented and SOLID design principles.

    6. Which Design Pattern Will You Use to Shield Your Code From a Third Party library Which Will Likely to be Replaced by Another in Couple of Months?

 This is just one example of the scenario-based design pattern interview question. In order to test the practical experience of Java developers with more than 5 years of experience, companies ask this kind of question.  You can expect more real-world design problems in different formats, some with more detail explanation with context, or some with only intent around.

 One way to shield your code from a third-party library is to code against an interface rather than implementation and then use dependency injection to provide a particular implementation. This kind of question is also asked quite frequently to experienced and senior Java developers with 5 to 7 years of experience.

   Question 7)  How do you prevent SQL Injection in Java Code?

This question is more asked J2EE and Java EE developers than core Java developers, but, it is still a good question to check the JDBC and Security skill of experienced Java programmers.

 You can use PreparedStatement to avoid SQL injection in Java code. Use of the PreparedStatement for executing SQL queries not only provides better performance but also shield your Java and J2EE application from SQL Injection attack.

 On a similar note, If you are working more on Java EE or J2EE side, then you should also be familiar with other security issues including Session Fixation attack or Cross-Site Scripting attack and how to resolve them. These are some fields and questions where a good answer can make a lot of difference in your selection.

   Question 8) Tell me about different Reference types available in Java, e.g. WeakReference, SoftReference or PhantomReference? and Why should you use them?

Well, they are different reference types coming from java.lang.ref package and provided to assist Java Garbage Collector in a case of low memory issues. If you wrap an object with WeakReference than it will be eligible for garbage collected if there are o strong references. They can later be reclaimed by the Garbage collector if JVM is running low on memory.

 The java.util.WeakHashMap is a special Map implementation, whose keys are the object of WeakReference, so if only Map contains the reference of any object and no other, those object can be garbage collected if GC needs memory. See Java Performance The Definitive Guide learn more about how to deal with performance issues in Java.

  core java technical interview questions and answers for experienced

   Question 9) How does get method of HashMap works in Java?

Yes, this is still one of the most popular core Java questions for senior developer interviews. You can also expect this question on telephonic round, followed by lot's of follow-up questions as discussed in my post how does HashMap work in Java.

 The short answer to this question is that HashMap is based upon hash table data structure and uses hashCode() method to calculate hash code to find the bucket location on the underlying array and equals() method to search the object in the same bucket in case of a collision. See here to learn more about how does get() method of HashMap works in Java.

    Question 10) Which Two Methods HashMap key Object Should Implement?

This is one of the follow-up questions I was saying about in previous questions. Since working of HashMap is based upon hash table data structure, any object which you want to use as a key for HashMap or any other hash-based collection e.g. Hashtable, or ConcurrentHashMap must implement equals() and hashCode() method.

 The hashCode() is used to find the bucket location i.e. index of the underlying array and equals() method is used to find the right object in a linked list stored in the bucket in case of a collision. By the way, from Java 8, HashMap also started using a tree data structure to store the object in case of a collision to reduce the worst-case performance of HashMap from O(n) to O(logN). See the article for learning more about how does HashMap handless collisions in Java.

    Question 11) Why Should an Object Used As the Key should be Immutable?

This is another follow-up of previous core Java interview questions. It's good to test the depth of technical knowledge of candidates by asking more and more questions on the same topic. If you know about Immutability, you can answer this question by yourself. The short answer to this question is key should be immutable so that hashCode() method always return the same value.

 Since the hash code returned by hashCode() method depends on the content of the object i.e. values of member variables. If an object is mutable than those values can change and so is the hash code. If the same object returns different hash code once you inserted the value in HashMap, you will end up searching in different bucket locations and will not able to retrieve the object. That's why a key object should be immutable. It's not a rule enforced by the compiler but you should take care of it as an experienced programmer. See the article for more advanced Java Collection interview questions.

    Question 12) How does ConcurrentHashMap achieve its Scalability?

Sometimes this multithreading + collection interview question is also asked as, the difference between ConcurrentHashMap and Hashtable in Java. The problem with synchronized HashMap or Hashtable was that the whole Map is locked when a thread performs any operation with Map.

 The java.util.ConcurrentHashMap class solves this problem by using a lock stripping technique, where the whole map is locked at different segments and only a particular segment is locked during the write operation, not the whole map. The ConcurrentHashMap also achieves its scalability by allowing lock-free reads as read is a thread-safe operation.  See here for more advanced multi-threading and concurrency questions in Java.

    Question 13) How do you share an object between threads? or How to pass an object from one thread to another?

There are multiple ways to do that e.g. Queues, Exchanger, etc, but BlockingQueue using Producer-Consumer pattern is the easiest way to pass an object from thread to another.

    Question 14) How do find if your program has a deadlock?

By taking thread dump using kill -3, using JConsole or VisualVM), I suggest preparing this core java interview question in more detail, as the Interviewer definitely likes to go with more detail e.g. they will press with questions like, have you really done that in your project or not?

   Question 15) How do you avoid deadlock while coding?

By ensuring locks are acquire and released in an ordered manner, see here for a detailed answer to this question.

  That's all on this list of Core Java Interview Questions for senior developers and experienced programmers. I haven't included a lot of questions from other important topics like Exception handling, Garbage Collection tuning and JVM Internals, which is also very popular among Java programmers with 5 to 6 years of experience, maybe I will include them in the next part.[Source]-https://www.java67.com/2013/07/15-advanced-core-java-interview-questions-answers-senior-experienced-5-6-years-programmers-developers.html

We provide the best Advanced Java training, navi mumbai. We have industry experienced trainers and provide hands on practice. Basic to advanced modules are covered in training sessions.

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MULTIFUNCTIONAL STOOLS INSPIRED BY MINIMALIST JAPANESE NESTING PUZZLES

There’s something about Japanese-inspired designs that instantly calm you lower, and wash you over and done with a feeling of peace. They always have the ability to the simple, minimal, and complicated. For this reason they always get me excited! One particular example could be the Multifunctional Stools. Inspired by traditional Japanese Shinto Kumiki puzzles, this set of nesting stools feature the Yosegi technique, the art of making exquisite patterns using inlaid wood. You will see that the Tsugite technique was even utilized, including getting together geometric wooden joints, leading to 12 gemstone-formed posts that effortlessly merge together. Because of these wooden joints and different posts, both stools could be used together to produce one space-saving stool! This space-saver can be simply set aside for storage. When separated in 2, additionally they work as companion seats or footrests. Constructed from Japanese Hinoki Cypress and Jindai Cedar plank, the stools showcase diverse warm tones of wood, flittering from more dark browns to lighter coffee hues. Uniting just like a puzzle, the Yosegi Stools function as minimal and classic decorative pieces, besides their seating functionality. The seamlessness that the Multifunctional Stools fit together as well as their unique geometric structure causes it to be no real surprise they won the Gold A’ Design Award in 2018. There exists a large amount of item and style of Japanese Stool or Shower Stool. Bamboo, suar wood and lychee wood is really a natural material that may be easily cut and formed. It’s provides you with the opportunity to make all kinds of tables. For example, you may make some form of wood logs, or possibly create some interesting shape from wood slices. Alas gembol is furniture manufacturer and export company situated in Java Indonesia, in which the largest teak plantation on the planet located. We've export permit and v-legal wood certificate. japanese low stool japanese stool design japanese stool plans japanese folding stool japanese meditation stool japanese bar stool japanese step stool antique japanese stool Read the full article