February 2023

6 Free DevOps Courses for Experienced Developers in 2023 - Best of Lot [UPDATED]

Hello Java Programmers and developer friends, If you are an experienced developer and want to become a DevOps Engineer or just want to learn the DevOps process and tools to improve your development and delivery process and looking for free DevOps online courses to kickstart your journey, then you have come to the right place. Earlier, I shared the best DevOps books and training courses, and today, I will share the best free online lessons to learn about DevOps. These free courses are created by experts and trusted by thousands of developers and they will teach you DevOps concepts, practice, DevOps tools like Docker, Jenkins, Ansible, and Kubernetes and suitable for both beginners and experienced developers. They are also curated from popular online learning platforms like Udemy, Pluralsight, and Coursera, and they offer practice and hands-on training.

3 ways to learn React Native for App Development in 2023

Hello guys, if you want to learn React Native for Application development but not sure how to learn and where to start then you have come to the right place. Earlier, I have shared best React Native courses and App development tools and technology and in this article, I am going to share best way to learn React Native in 2023, by reading books, joining online course and building projects. Mobile application development has advanced immensely in the last decade. Along with the web, demand for mobile applications has increased tremendously. Moreover, web applications are created by keeping the “Mobile-first approach” in mind.

How to Learn Python Programming and Development in 2023?

If you want to learn Python Programming language online in a week on your own and looking for the best online Python resources then you have come to the right place. In the past, I have shared the best Python courses, books, Python developer RoadMap, and tutorials, and today, I am going to share with you the exact step-by-step plan to learn Python programming from scratch in 7 days by joining the best Python courses on Udemy, one of my favorite and most affordable website for online learning. After thorough research, combined with my own experience, I have chosen two of the best Python Bootcamp courses which can be used to learn Python from scratch in a week's time.

Top 5 programming Languages for Artificial Intelligence in 2023 - Best of Lot

Hello guys, if you want to do AI Development or want to create Artificial Intelligence based apps and looking for best programming language then you have come to the right place. Earlier, I have shared best programming language for web development, app development, and data science development and today, I am going to share best programming language for AI Development. All programming languages are not created equal. Only a handful of programming languages remain and serve the community out of countless. The programming languages we'll be discussing presently have stood the test of time. For decades, they've been used for a variety of undertakings.

Top 5 Websites to Learn System Design and Software Design in 2023 - Best of Lot

Hello guys, if you are preparing for System design Interview and looking for best resources to master Software design and System design then you have come to the right place. Earlier, I have shred best System Courses, Books, and System Interview Questions and in this article, I am going to share best places to learn System design in 2023. Before we get to the best websites that will teach you everything you need to know about system design, let me tell you a little bit about what it really is. Systems design is basically the process of defining elements of a system including modules, architecture, components, interface, and data for a system based on a specific set of requirements. It can also refer to the process of defining, developing, and designing systems. These designs have to satisfy the specific needs of a company or an organization.

Whizlabs Review - How to Learn Docker, Kubernetes, AWS, Azure, and Google Cloud Platform using Hands-on Labs?

Hello guys, Cloud computing is rapidly becoming one of the essential skill for all kind of developers and no matter what you will need to learn Cloud Computing if you want to remain marketable. I learned this truth couple of years ago and since then spent a lot of time learning AWS, Azure, Kubernetes, Docker, and Google Cloud Platform. The big problem with learning Cloud computing and different cloud platform like AWS and Azure is that you cannot learn them by reading books or watching course. You need real, hands-on practice which can only be possible by either using the free tier of respective platform or using hands-on labs like the one provided by Whizlabs and QwikLabs.

10 Data Structures Every Programmer Should Learn (with Practice Exercises)

Data Structure and Algorithms are two pillars of Programming. You may know that "Data Structure + Algorithms = Computer Program". They are also the most important ingredient of a good program and right choice of Data Structure and Algorithms can improve performance drastically, whereas a wrong choice can spoil the party, but do you know what exactly they are? Well, Data Structure are nothing but a way to store data, while Algorithms are ways to operate on that Data. There is a reason why Data Structure and Algorithms are taught in every single Computer Science classes, it doesn't matter whether you are learning Java, C++, Python, JavaScript, Golang, or any other programing language, those data structure and algorithm will be same everywhere.

Coursera Plus Review - Should you Learn on Coursera in 2023? It it worth it?

Hello guys, As a programmer, we always need to learn new skills, frameworks, technologies, and libraries, and we often end up buying so many courses for that; I know people who have more than 300 courses on Udemy and other online courses platforms, but Coursera now has a better way, Coursera Plus. This is a subscription plan for Coursera courses and specializations, which will provide you access to their 7000+ courses, guided projects, specialization, and professional certificates with just one subscription. It costs around $390 per year or $59 per month, which may sound more than other subscription and membership online learning portals like Pluralsight, Educative, and CodeCademy, but Coursera provides certificates and courses worldwide reputed universities which no one else.

How to fix java.lang.OutOfMemoryError: unable to create new native thread in Java [Solution]

It's been a long time since I shared any Java Error or Exception troubleshooting tutorial so here we are. In this post, we will take a look at the "java.lang.OutOfMemoryError: unable to create new native thread" error which is a rate but quite possible in multithreading Java applications. This is another Java OutOfMemoryError that comes when JVM hits the native thread limitation allowed to be open by one process and not able to create any more new threads. Since each Java thread is associated with the OS thread, when OS refuses to provide a new thread, JVM throws OutOfMemoryError. It's rarely you will see common Java applications throwing this error but it's common when multiple application is using the same Java process e.g. Web Server Tomcat and a significant number of threads are allocated due to high load.

How to display full command a Running Process in Linux and Solaris? Example

One of the problems with ps command, which is a popular tool to find any processes along with the grep command in the Solaris operating system is that it doesn't show full command-line argument of process. This means if you are doing grep on any text which appears at the tail end of the long command line, you will likely not able to capture that process by using ps and grep. This is dangerous because it may lead you to assume that certain process is not running and you may restart it again, despite its being running and only because you didn't find the process.

50+ Java Collections and Generics Interview Questions and Answers

Hello guys, If you are preparing for Java interviews then you may know that Java Generics and Collections are two of the most important topics, particularly Generics where some of the trickiest Java questions can be asked. They are also used to gauge your experience and depth of your Java knowledge, hence it's imperative for both beginners and experienced Java programmers to prepare this topic well. While the Java Collection framework provides an implementation of some command data structures like List, Set, Array, Hash table, Queue, Stack, PriorityQueue, etc, Generics provides Type safety.

How to update value in ConcurrentHashMap atomically in Java? Compute and ComputeIfAbsent Example

Hello guys, if you have been doing Java development then you know that Java 8 brings a lot of changes not just on programming language part by introducing Lambda expression, default methods on interface, static method on interface but also on API and SDK part like Stream API and new Date and Time API. But while those bigger changes get lot of coverage many small changes but very useful in day to day programming task doesn't get enough mention and many Java programmers are unaware of those. One of such enhancement was addition of compute(), computeIfAbsent(), and computeIfPresent() method in java.util.Map interface. Adding a new method on an existing interface was not possible before Java 8 but new feature like default and static method on interface made it possible and Java designers take full advantage of these two feature to enhance and improve existing interface like Collection and Map.

Top 5 Websites for Coding Interview Preparation - Best of Lot

Are you preparing for Coding Interviews? If yes then you might know that there are a number of free online resources to practice important topics for coding Interviews like data structure and algorithms, database and SQL, and others. These websites are equally useful for both, new programmers who are just learning the fundamentals and for experienced ones who are brushing up their coding skills for interviews. I have been sharing useful resources for programming and technical interviews for a long time in this book. In the past, I have shared some recommended online courses and books for coding interviews, as well as some of the frequently asked programming interview questions from tech companies (see here). But, my readers have been asking about some recommended websites for practicing programming challenges and coding interview questions.

Top 15 Cyber Security and Information Security Interview Questions and Answers in 2023

Hello guys, If you are preparing for Cyber Security Engineer interviews or just want to learn more about Cyber Security in 2023 you have come to the right place. Earlier, I have shared best Cyber Security courses and free Cyber Security tutorials and in this article, I am goin to share frequently asked Cyber Security interview questions with answers so that you can revise essential Cyber Security concepts quickly before your interviews. There is no doubt that cybersecurity jobs are the only IT domain that has never experienced a recession yet because companies have a lot of sensitive data in their servers and database so anyone can take advantage of the security weaknesses and exploit them. That's why there is also high demand for Cyber Security experts, but clearing a Cyber Security Job interview is not easy.

Top 13 REST Web Services Framework Interview Questions Answers

Hello guys, today's world is about Microservices and REST architecture is the one which powers Microservices. REST web services have quickly become the defacto web services in the web development world and have almost replaced SOAP-based web services that rule the world before. With the growing use of REST APIs in web technology space REST is also becoming increasingly important on J2EE and other web development interviews and if you say you know web-service then be prepare for some REST concept related questions.

Top 10 Testing Tools and Libraries for Java Developers in 2023 [UPDATED]

In the last couple of weeks, I have written quite a few articles about what Java developers should learn in 2023 like programming languages, libraries, and frameworks, but if you have just one thing to improve or learn then that must be your testing skills. Testing is one of the disciplines which separates professional developers from amateur ones. It's not about following Test-driven development (TDD), Business Driven Development (BDD), or whatever testing methodologies but at the very minimum level, you must write code to test your code automatically. Many Java developers write unit tests and integration tests that automatically run during build time, mostly by using continuous integration tools like Jenkins or TeamCity.

Top 5 Online Courses to Learn Coding and Software Development in 2023 - Best of Lot

Programming and/or Coding is one of the essential skills for today's technological world, and awareness of coding is growing every passing day. In my time, about 20 years back, I only learned to code when I entered engineering college to pursue Computer Science and Engineering degree, but things have changed a lot since then. Nowadays, even kids have started learning to code, even my daughter can code, and much better than what I can also do in college. More accessible computing gadgets like iPad, iPhones, smartphones, and Laptops have genuinely changed the environment and made Coding or Programming more accessible.

10 Tips to work Faster in Linux Command Line and Bash Shell

Hello guys, Have you ever been amazed to see someone working very fast in UNIX, firing commands, and doing things quickly? Yes, I have noticed that a couple of times, and I have always been inspired to learn from those superstar developers. I have shared a lot of content on Linux from the Developer's point of view, including 5 Free Linux Courses for Programmers, and in this article or tutorial or whatever you call it, I have dedicated myself to sharing some UNIX command practices I follow to work fast, quick, or efficiently in Linux. I work for the Financial services industry, and my work involves the development and support of online stock and futures trading applications in Electronic trading, Derivatives, etc. All our services run on Linux servers, so I need to work efficiently and quickly on the Linux machine, and that's how I have learned these productivity tips in Linux.

How to use var keyword to declare local variables in Java? Example Tutorial

Hello guys, In this series of new features of Java 10 articles, today, I am going to talk about probably the most popular and most useful, the introduction of var keyword (well, it's not really a keyword but I'll you later about it) in Java. If I am not wrong, this feature was supposed to come on Java 9 but dropped later. Finally, Java also has a var keyword to declare local variables which allows you to declare a variable without their type like instead of doing String str = "Java" you can now just say var str = "Java". This may not sound much gain when declaring String or an int variable but consider complex types with generics, this will surely save a lot of typing and also improves the readability of code.

How to Sort a List in Reverse Order in Java? ArrayList Example

Java Collection Framework provides a convenient reverse comparator, to sort a List of objects in reverse order. You can obtain reverse Comparator, by calling Collections.reverseOrder(), which by default sort List of Integer in reverse numeric order and List of String in reverse alphabetic order. It actually reverses the natural ordering of objects imposed by the Comparable interface. Apart from this method, Collections class also provides an overloaded method Collections.reverseOrder(Comparator cmp), which takes a Comparator, and sorts List on reverse order of that Comparator.

What is the real use of Method overloading in Java and Object Oriented Programming? Example

Many programmers, including Java and C++ developer, knows about the object oriented programming concepts like method overloading or function overloading, but if you ask them why you should overload a method? Many of them become clueless. This is a common problem of half learning i.e. you know the concept but you don't know the application. If you neither know what problem it solves nor what benefit it provides, then just knowing the concept is not enough. You won't be able to reap all benefits if you just know the concept and never use that in practice. If you are wondering what is the real use of method overloading then don't worry, I will share the answer in this article. Btw, this is also one of the popular object oriented programming interview question and its good to know about it.

How to deal with NullPointerException in Java with Examples - java.lang.NullPointerException Guide

The java.lang.NullPointerException or NullPointerException in Java is probably the first error or exception you will face in Java. It is a true nightmare for beginners in Java but pretty easy to solve once you get familiar with Exception handling in Java. What makes NullPointerException a little bit tricky to solve is its name which has a pointer in itself and Java does not support pointers like C++ or C, just like you don't have multiple inheritances in Java. As a Java developer with 20 years of experience, I have solved countless amount of NullPointerException and now I have developed a coding and debugging sense through which I can spot what causing a particular NullPointerException and how to fix it.

How to Iterate Over Rows and Cells of Excel file in Java - Example

Hello guys, if want to iterate over all the rows in a excel sheet inside your Java program to process data row by row for example copying from Excel file to Database and you are looking for a pure Java solution then you have come to the right place. Earlier, I have shared how to read from excel file and how to write into Excel file in Java and today, I will show you how to go over all the rows in a Excel file one by one. We will use Apache POI, a popular core Java library to work with Excel files. It support XLS, XLSX and other open office Excel file formats. The library is also open source so you don't need to buy any license or pay for it. All, you need is to include the JAR file in your application's classpath.

10 Tips to Improve Programming Skill and become a better Programmer

Many Java developers ask me how to become a better programmer? How do I improve my programming skills? Or I am good at Java but not so good at problem-solving ability etc. This is a reality, today's era is full of language experts than real programmers. It's easy to understand keywords, methods, and API of the Java programming language. Still, at the same time, it's challenging to solve practical problems, design reusable, and robust software, and get the best of data structure and algorithm. I have often seen Java programmers are not doing so well when asked to design and code a solution in a limited time, but at the same time, they are really good with Java concepts and all theories.

Is 101 Blockchains Certifications worth it? Review?

Hello guys, if you want to start your career in Blockchain field and wondering going for a Blockchain certification then you have come to the right place. Earlier, I have shared 2023 Blockchain Developer RoadMap and these best Blockchain certifications to start your career in 2023 and in this article, I am going to review one of the popular Blockchain certification provider, 101 Blockchains Academy. The worldwide blockchain industry is expanding at an unnerving rate for a technology that came only a decade ago. In 2021, the global market had a valuation of almost $4.67 billion and might reach $7.18 billion in 2022. At the same time, blockchain adoption in the financial sector is at an all-time high. Healthcare and many other industries are gradually joining the blockchain revolution. As a result, many people search for blockchain certifications to support their career development goals.

Top 10 Tools and Technologies App Developers can Learn in 2023 [UPDATED]

Hello guys, Mobile app development is a lucrative field for programmers as it has all kinds of opportunities, from freelancing to working at large companies and launching your own apps like Angry Bird, Flappy Bird, or Pokemon Go and becoming an App millionaire also known as Appreneur. If one of your goals in 2023 to learn Mobile application development and you wondering how to start, then you have come to the right place. In this article, I am going to share 10 tools, frameworks, and technologies you can learn to become a mobile application developer or someone who wants to improve as a mobile application developer for Android and iOS platforms can learn in 2023. This list includes things like framework, programming languages, and platforms, almost everything a mobile developer needs.

6 Topics You Must Prepare for Programming and Coding Interviews in 2023

Hello folks, are you thinking of a new job in 2023 and looking for which topics and skills to prepare for your coding interview? There is no doubt cracking the Coding interviews of tech companies like Google, Microsoft, and Amazon is very hard. However, you can still break it by carefully planning and preparing the essential skills which matter most, like Data structures and Algorithms, System Design, Multithreading and Concurrency, SQL and Database design, and of course, problem-solving skills. Being an author of Java and a programming blog, I often receive queries about preparing for coding interviews? How to pass Google or Microsoft Software Developer interviews? Or how can I get a software development job on Amazon or Facebook? After answering many of my readers one by one on Facebook and LinkedIn, I thought to put together a list of essential topics for coding interviews.

Top 23 Skills Java Developers Should Learn in 2023 [UPDATED]

Hello guys, recently I was doing some research on what skills Java developers should learn in 2023 to become a better developer and give their career a boost and I found some interesting skills like Kafka and Elastic Search, apart from obvious ones like Spring Boot and Microservices. One of my favorite places for doing such research is examining Job listings on LinkedIn from different companies like Investment banks, Service-based companies, startups, and mid-tier companies where Java is used extensively. When I saw those skills, I can immediately tell that those are really useful and worth sharing with you guys, as I have often seen those skills playing important roles while hiring Java developers.

10 Essential UTF-8 and UTF-16 Character Encoding Concepts Every Programmer Should Learn

Hello guys, if you want to learn about character encoding, particularly UTF-18 and UTF-16, and looking for a good resource then you have come to the right place. In this article, I am going to discuss 10 important points about UTF-8 and UTF-16 character encoding which I believe every programmer should learn. This is one of the fundamental topics to which many programmers don't pay attention unless they face issues related to character encoding. Knowing how a character is stored and how they are represented in such a way what computer can understand is very important in this age of globalization and internationalization where you need to store and work through data that contains characters from multiple languages.

Top 25 Big Data and Hadoop Interview Questions and Answers

Hello guys, as a Java developer you not just prepare for Java questions but also for different areas related to Java like Big Data and Hadoop depending upon job requirements. If you are going for a Job where Kafka, Apache Hadoop, or Spark is listed as required skill then it make sense to prepare for Big Data Interview questions covering Kafka, Spark and Hadoop. Big Data is e of the most rapidly growing technology is big data. With the rise of Big Data comes a widespread adoption of Hadoop to address important Big Data issues. Hadoop is one of the most widely used frameworks for storing, processing, and analyzing Big Data. As a result, there is always a need for professionals in this industry. However, how do you get a job in the Hadoop field?

3 ways to Learn Web development in Depth in 2023

Web development has changed a lot in the recent decade. More and more frameworks and libraries have come out while the older ones are either updated or left out. For example, React and Vue has debuted in the mid-2010s and quickly became popular while AngularJS was completely re-written to survive modern web development. Today, Web development is one of the most popular domains in the IT community. Every company or product wants a website because the web is easily accessible today. Even when mobile applications are gaining popularity, the web remains at the top.

How to get Id of an HTML and DOM object in jQuery? Example Tutorial

As a page author, the id of an HTML element is something you should know. Still, there are scenarios when the page is automatically generated, or maybe some form elements are generated by using frameworks like JSF. In that case, what do you do if you want to find an id attribute of some elements in the page programmatically? How do you find those ids using jQuery? There are several ways to solve this problem, a couple of them in this article itself. The jQuery API provides many methods to get any attribute or property, including the id of an HTML element programmatically.

3 ways to learn Node.js in Depth in 2023

Hello guys, if you want to learn Node.js and Express.js in depth but not sure where to start and how to progress then you have come to the right place. Earlier, I have shared best MERN stack courses and today, I am going to share best way to learn Node.js in depth with resources. Today, JavaScript is one of the most popular programming languages in the world and certainly, it is the most popular and widely used programming in web development. Earlier, JavaScript was only used on the frontend development because it could only be executed in a browser. For the backend development, other languages such as Java and Python were used.

How to use @ModelAttribute in Spring MVC? Example Tutorial

Hello guys, there are many annotations in Spring boot which I have shared 5 essential Spring Boot annotations earlier and from those, the @ModelAttribute takes a special place as this helps to bind a method parameter or method return value to a named model attribute then exposes it to a web view. So we are going to discuss what is @ModelAttribute in Spring MVC with an example given below. The @ModelAttribute annotation refers to a Model object attribute (the M in MVC ;). The @ModelAttribute annotation is special to Spring-MVC and is used to prepare model data. It's also used to specify the command object that'll be tied to the data from the HTTP request.

Java 8 Parallel Stream Example? How to improve performance by using parallelStream()

Hello guys, If you have been coding and programming in Java for a long time then you know that how hard it is to make an algorithm to run in parallel. You need to create multiple threads, make sure that they are properly synchronized and then need to co-ordinate between them to make it faster. But from Java 8, you can use parallel streams to improver performance of your CPU intensive algorithms without breaking your head over synchronization and threads. The Stream API allows you to run the stream operation in parallel by just calling the parallelStream() method. This is as simple as it can be to make your code take advantage of CPU power and run faster, and make your algorithm parallel and concurrent. You don't need to worry about creating or starting threads or coordinating between them. Just call this method and everything is done for you.

Spring Boot @Autowired Example - How Autowiring of Beans works in Spring?

Hello guys, if you are wondering how to use @Autowired annotation in Spring Boot and how auto-wiring works in the Spring framework and how the Spring framework magically finds dependency and relevant beans to inject into your program then you have come to the right place. In the past, I have shared how Spring MVC works and in this article, I am going to explain how auto-wiring works in spring and how you can use @Autowired annotation for auto-wiring dependencies in your code. In Spring, you need to know the most important things before starting your coding. From spring 2.5 onwards, the annotations-driven dependency injection was introduced and it is used to inject collaborating beans into the beans. So in this tutorial, we are going to explain how does auto wiring work in spring.

Spring Boot + Angular + Java Project Example and Tutorial

Hello Java programmers, if you are looking for a full-stack Java project with Spring Boot and Angular then you have come to the right place. Earlier, I have shared best Spring Boot courses, books as well as Spring boot + Reactjs project and In this tutorial, we are going to discuss how to create your first application using spring boot and angular. So we are using a simple crud application to build the application here. Here we create a School Classroom Dashboard application that can insert, update, delete and search students. The frontend of the application will be handled by angular and the backend of the system is using the spring boot. This is also a great Spring boot project beginners to do learn Spring boot better. So let's have a look into this.

The 2023 PHP Developer RoadMap

Hello guys, if you want to become a PHP developer in 2023 and looking for guidance like PHP Developer RoadMap, particularly PHP Backend developer roadmap then you have come to the right place. Earlier, I have shared best free PHP courses and MySQL courses for web developers and today, I am going to share how to become a PHP Developer in 2023 and a complete PHP Developer RoadMap which you can follow along. Making web applications can be fun and a promising career since it is insignificant demand and has a respectful salary. Many people are even learning this skill and working as freelancers from home. If you are planning to learn this skill, I will suggest learning the PHP language to make the back-end code of the web apps. This article will help you learn the roadmap to becoming a PHP developer.

Top 5 Common Spring Bean Exception, Error and Solution [BeanDefinitionStoreException, NoSuchBeanDefinitionException, BeanCreationException]

Hello guys, error handling and troubleshooting is an important skill for Java developers. During development you can get variety of exception and sometime they are quite difficult to solve especially if you have no clue what they are and what causing them. Things can be even more difficult if exception is coming from the framework you are using like Spring Framework or Hibernate, that's why its important to know common error and exception for standard framework like Spring. In this article I will explain what BeanDefinitionStoreException, BeanCreationException, NoSuchBeanDefinitionException and BeanDefinitionOverrideException are, what can cause them and how to fix those problems.

How to use Named Query SQL in Spring Framework? Example Tutorial

Hello guys, many Java developers don't know that Spring Framework also provides support for NamedQuery where you can pass parameters in a much readable way by using named placeholders than the default placeholder of ? (question mark) which is used with PreparedStatement in Java. If you want to learn Spring JDBC then you have come to the right place. In the past, I have shared the best Spring Framework courses, books, and tutorials to learn Spring Framework and its different features, and in this example, I will show you how to use NamedQuery in Spring Framework. You can then use this technique to write much more readable queries on the Java layer for your application.

Top 23 Design Patterns Experienced Java Programmers Should Learn

Hello guys, if you want to learn Design Patterns and looking for a comprehensive tutorial which covers all important object oriented design pattern then you have come to the right place. Earlier, I have shared best Design pattern courses and books for experienced developers and in this article, I will introduce you with 23 common object oriented design patterns for writing better code. Design Patterns are tried and tested way of solving a problem within a given context. They are not invented, rather they are discovered, which is also obvious by use of word pattern. By using design pattern, you take knowledge of all wide communities and can safely use it to solve that problem. At times they might not give you perfect solution, require bit of tweaking, but they certainly provides one of the best solution, as long as you use them properly. While doing object oriented development, they are numerous task which appears quite often e.g. creating objects, structuring code, and implementing different behaviors based on different context.

Does Order of Multiple intercept-url's in Spring Security Matters?

Hello guys, one of the frequently asked Spring Security Question is about the order of multiple intercept-urls in Spring security configuration file e.g. applicationContext-security.xml. If you have to define more than one intercept URLS, which order will you define them? Does order even matters? The short answer of this question is, Yes, ordering of intercept URLs in Spring Security configuration file does matter and if you have to define multiple intercept-urls then you define the in a order from most specific to least specific. Why you should that? because Spring security tries to match the URL of every incoming request or outgoing response to the intercept urls in the same order they are declared. So if you declare the least specific URL first then most of the request will match that URL pattern and your more specific pattern will never execute.

How to use State Design Pattern in Java? Vending Machine Example

The State design pattern is a behavioral pattern, first introduced by GOF in their class is book design patterns. State pattern looks similar to Strategy pattern but it helps in managing object state and thus enabling them to behave differently in a different state. In this example, we will take a famous object-oriented design interview question, implementing Vending Machine in Java. In the past, we have solved this problem without using any design pattern, but here we will use state design patterns to create a vending machine with different states. This example will not just help you to understand how to implement State Design Pattern in Java but also gives you experience about when to use State Pattern on your application.

Top 7 Websites to learn HTML and CSS Online for FREE - Best of Lot

Hello guys, if you want to learn HTML, CSS, and Responsive Web Design and looking for best free resources like online courses, books etc then you have come to the right place. Earlier, I have shared best free HTML and CSS Courses, and books and today, I am going to share best places to learn HTML and CSS for FREE. Every web page in this world has at least two programming languages to be designed which are HTML and CSS. These two languages give the design of every page and HTML is responsible for the structure of the web pages such as the buttons the text and so on but CSS is the styling language where you can color the text the buttons the sections adjust the width the height and much more.

How to test a Spring Boot Application using JUnit, Mockito, and @SpringBootTest? Example Tutorial

Hello guys, if you are wondering how to test your Spring Boot application then you are at the right place. In the past, I have shared several Spring and Spring Boot resources like best Spring boot courses, best Spring Boot books, Spring Boot Interview questions and even Spring Boot projects and in this article, I am going to share how to test your Spring Boot application using @SpringBoot annotation. This article will teach you essential concept for testing Spring Boot applications. It's expected that you are know about essentially the fundamentals of Java, Maven and Spring Boot (Controllers, Dependencies, Database Repository, and so on).

10 Reasons to learn JavaScript Programming Language in 2023

Hello guys, if you want to become a web developer or a fullstack web developer who can code frontend, backend, and both web application and mobile apps then you must learn JavaScript. It's one of the most popular programming language with lots of jobs and opportunity and its also very easy to start learning. If you also want to learn JavaScript but not sure whether JavaScript is the right programming language or not, or want to learn JavaScript but not sure whether its worth the effort then you are the right place. Earlier, I have shared best JavaScript courses, books, and best places to learn JavaScript and in this article, I am going to share 10 key reasons to learn JavaScript in 2023.

AES Encryption and Decryption in Java - AES Encoding Decoding Example Tutorial

Hello Java programmers, if you are looking for an example to encrypt and decrypt a test using the AES algorithm in Java then you have come to the right place. Earlier, I have shown you how to Base 64 encode and decode a String in Java, and in this article, I will teach you how to encode and decode a string using AES Algorithm. If you don't know, AES stands for Advanced Encryption Standard algorithm and it is a symmetric block cipher that is used to protect classified information by many Government and Security organizations. You can use AES to encrypt sensitive data in your application config file like database password, user login details and keys etc. In our example we will be using an AES Algorithm with AES - 128, AES has a fixed block size of 128 bits. We will be using a password based secret key.

Difference between Proxy and State design Pattern in Java

Hello guys, if you are preparing for Java interviews and looking for difference between Proxy and State design pattern then you have come at the right place. In the past, I have explained several important object oriented design patterns like State patttern, Strategy, Adapter, Facade, Factory, Observer, Decorator, Command, and Composite Pattern and also shared frequently asked questions on design patterns (See here) and in this article, I am going to share the key difference between Proxy and State Design Pattern in Java and OOP. The difference between Proxy and State pattern comes in both intent and structure, here are the key difference between both Proxy and State Design Pattern in Object oriented programming.

How to use props in React.js? Functional and Class Component + Properties Example Tutorial

Hello guys, If you have ever worked with React.js, one of the popular JavaScript library for building UI components then you definitely know what components are. A React application is made of several components and that is why components in React are defined as the building blocks of the application. In simple terms, a component is a class or function that can accept input and return a piece of code that defines a UI. Every React component can have input. These inputs are known as props. Props stand for properties and they are optional. A component works fine without props but they are one of the most useful parts of React.

3 Best ways to learn Angular Framework in 2023

Hello guys, if you want to learn Angular in 2023 but not sure how and where to start then you have come to the right place. Earlier, I have shared best Angular courses, books, tutorials, and interview questions and in this article, I will share how to learn Angular from scratch in 2023. Angular is Type-Script based frontend framework that is used to create single-page web applications. Angular has been active in the web development community for a long time. It is one of the first frontend JavaScript frameworks.

[Solved] How to Implement Binary Search in Java without Recursion? Iterative Algorithm Example Tutorial

Hey Java programmers, if you want to implement a binary search in Java, and looking for both iterative and recursive binary search algorithms then you have come to the right place. Earlier, I have shared the free courses to learn Data Structure and algorithms in Java, and today, I am going to teach you an important algorithm. In computer science, a binary search or half-interval search is a divide and conquer algorithm which locates the position of an item in a sorted array. Binary search works by comparing an input value to the middle element of the array. The comparison determines whether the element equals the input, less than the input or greater.

Top 20 Amazon and Google Programming Interview Questions for Software Developers

Hello, In this article I am going to sharing some frequently asked programming job interviews from technical giants and startups. If you are going for a programming job interview with Microsoft, Google, or Amazon, you better be prepared for all kinds of questions. These companies are known to ask tough questions, tricky puzzles, and lots of data structure and algorithm questions. Since it's hard to prepare all these in a short time, it makes sense to at least have a good idea of frequently asked programming questions in Microsoft, Google, or Amazon.

Difference between Statement vs PreparedStatement vs CallableStatement in Java JDBC

Hello Java programmers, if you are looking to find out the difference between Statement, PreparedStatement, and CallableStatement in Java then you have come to the right place. Earlier, I have shared common JDBC Interview Questions and in this article, I am going to explain what is the real difference between these Statement types in Java and when to use Statement, PreparedStatement, and CallableStatement in Java programs. JDBC API provides several classes and interfaces for various things, but three of the most important types of Statement classes are Statement, PreparedStatment, and CallableStatement. They are designed to execute different types of SQL queries.

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