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Top 75 Programming Interview Questions Answers to Crack Any Coding Job Interview

Hello guys, if you are preparing for your next Programming Job interview and looking for some frequently asked Coding or Programming questions to practice then you have come to the right place. In this article, I am going to share some of the most commonly asked Coding questions from Programming Job interviews. In order to do well on the Coding interview you need practice, you just can't go there and try to solve the coding problems in limited time, that's actually one of the most common reasons to fail your programming Job interviews.  Sometimes, the interviewer also asks a little bit easier coding questions on a telephonic interview like revering array in place or reversing a string in place.

Top 5 Free Courses to Learn CSS and Bootstrap in 2020 - Best of Lot

Bootstrap is one of the most popular front-end libraries which provides a customizable template of HTML, CSS, and JS for creating a modern and responsive website. All the beautiful website you see these days with large fonts and slick form fields are built using Bootstrap. If you want to learn Bootstrap and looking for some excellent online courses, then you have come to the right place. In this article, I am going to share some of the excellent Bootstrap courses, which are also free, and you can use them to kick-start your journey with the Bootstrap framework. If you are interested in modern web development, this is the framework you must learn this year.

10 Examples of an Array in Java

Along with the String, the array is the most used data structure in Java. In fact, String is also backed by a character array in Java and other programming languages. It's very important for a Java programmer to have good knowledge of array and how to do common things with array e.g. initialization, searching, sorting, printing array in a meaningful way, comparing array, converting an array to String or ArrayList and doing some advanced slicing and dicing operation with an array in Java. Like my previous tutorials 10 examples of HashMap in Java, I'll show you some practical examples of an array in Java. If you think, any important operation is not included, you can suggest their examples and I'll add them to this list.

5 FREE courses to learn Flutter in 2020 - Best of Lot

Hello guys, App development is the need of this hour, and Flutter is the best framework you can learn for Mobile development. In this pandemic, where everyone is forced to stay home and work remotely are continuously looking for different apps that can make their "Work from home" process a little easier.  So, if you are a programming enthusiast, then this is the most appropriate time to learn new skills and to try your hands in a different field. Besides this, App development is an emerging field; thus, stepping in could give you a bright future.

How to implement linked list data structure in Java using Generics

The linked list is a popular data structure for writing programs and lots of questions from a linked list are asked in various Programming Job interviews. Though Java API or JDK provides a sound implementation of the linked list data structure as java.util.LinkedList, a doubly-linked list, you don't really need to implement a linked list of your own for writing production code, but all these interview questions require you to code a linked list in Java for solving coding problems. If you are not comfortable creating your own a linked list, it would be really difficult to solve questions like reversing a linked list or finding the middle element of a linked list in one pass.

Top 10 Programming Languages that will Earn you the highest pay in 2020

Since last a couple of the week, I have been doing some research about what to learn in 2020 when I stumbled about StackOverflow's Developer Survey. It's one of the best surveys for software developers, which provides useful insights about programming and IT world. One of the things I really like about this survey was its several lists like the list of top 10 programming languages and the most loved frameworks by programmers. Still, the one I found most useful was the list of high paying technologies. This is a great list and allows you to choose what you can learn in 2020 to go to the next level in your career in terms of both financial and career growth.

Top 5 Free Courses to learn jQuery in 2020 - Best of Lot

Hello guys, if you are thinking of learning jQuery and looking for some excellent free resources e.g., books, tutorials, and online courses, then you have come to the right place. In this article, I am going to share some of the best free jQuery courses from Udemy and, Pluralsight which you can take to learn this impressive JavaScript library. In the past, I have also shared some free books and tutorials on jQuery, which complements these courses. You can also take a look at then while learning different parts of jQuery.  Before I share these free courses, let me brief you about what jQuery is and why you should learn it? Well, jQuery is a JavaScript library, but unlike any other library, it is very powerful and makes the client-side scripting really easy.

Is Java a Good Programming Language to Start With?

I often receive questions like which is the first programming language to learn first, Is Java the right programming language to start in 2020,  how good Java is as a first programming language, which is the best programming language for beginners, or shall I start with Java or Python. Well, the answer to all these questions is, Java is one of the most popular programming languages, and there are a lot of reasons to learn Java, starting with Job opportunity to leverage community support. In the context of beginning programming or choosing Java as the first language, my most significant reason is that it's simpler to learn. The last generation of programmers started learning to program using languages like BASIC and then grew up learning C and C++ with Java as their second or third programming language.

Top 5 Courses to learn PyTorch and Keras for Machine Learning - Best of Lot

Hello guys, PyTorch and Keras are two deep learning libraries developed by two big companies Facebook and Google aiming to facilitate the creation of deep learning applications like face recognition and self-driving cars, and so on. Pytorch is a deep learning library developed by none other than tech giant Facebook to build machine learning models like NLP and computer vision just to name a few. Keras is just an interface that lets you reach the behemoth of the other deep learning libraries like TensorFlow, Theano, and Microsoft CNTK.

Top 40 Binary Tree Coding Interview Questions for Programmers

A lot of programmers and my readers have been asking me to share some binary tree-based coding interview questions, just like I have done for the array, linked list, string, software design, patterns, hash table, and data structure in general. This task was actually pending for quite some time and it was stuck for me trying to find the solution for each and every question I could have collected. So, I decided to publish the list of binary tree interview questions now and possibly publish the solution as a separate article later. This is like creating an interface and providing implementation later so that you don't block other people who are dependent upon your interface (actually, this is one advantage of using the interface in Java or any other programming language).

Top 5 Free Courses to learn Android Programming in 2020 - Best of Lot

Hello guys, Happy New Year, 2020 in advance. I am sure you all have made your goals and started planning on how to achieve them. If you are passionate about creating mobile games and applications and want to learn how to develop Android apps or want to become an Android application developer, then you have come to the right place. In this course, I am going to share some of the best and free Android development courses for Java programmers and others. You might know that earlier Java was the only language that is used to create Android applications. Still, since last year, Google has announced Kotlin as the official language for Android app development, which means you can use either Kotlin or Java to create Android apps.

Post order traversal Algorithms for Binary Tree in Java with example

In the last couple of articles, you have learned about pre-order and in-order tree traversal algorithms in Java, and today, you will learn about the post order traversal in a binary tree. It is the toughest of all three tree traversal algorithms and programmers generally struggle to implement this when asked in a coding interview, hence it makes sense to understand and practice this algorithm before going for the interview. The post order traversal is also a depth-first algorithm because you go deep before you visit other nodes on the same level.

What Every Java Programmer should know about Array Data Structure

Without any doubt, the array is one of the most used data structure in all programming languages, including Java. Pick up any programming language be it functional, object-oriented, imperative or even scripting languages like Python, Bash, and Perl, you will always find array. That's why it's important for any programmer to have a good understanding of the array data structure. Like any other data structure, the array also provides a way to organize and store objects, but the way it does makes all the difference. An array is used to store elements in the contiguous memory location and many C, C++ programmers can take advantage of a pointer to work with an array.

Top 5 Courses to learn Microsoft Power BI for Data Visualization in 2020 - Best of Lot

Hello guys, If you are doing Data Analytics and Data visualization then you might have come across Microsoft Power BI, a cloud-based tool that is quickly getting very popular among Business Analysts and other technical people who work with Data. Power BI is a tool offered by Microsoft corporation to create various types of visualization using your data and produce stunning reports and dashboards so you will get insights into your business and make the right decision. You can use Power BI on your desktop or using the Power BI on the cloud or even on your mobile as an app it’s up to you how you will use it.

Top 5 Free Courses to Learn Bash and Shell Scripting in Linux Online - Best of Lot

Hello guys, the importance of Linux is well known but what many programmers don't know about how to write shell scripts to make most of it.  Some of them even not familiar with various Linux shells like bash, csh, or ksh, which further limit their ability. If you don't know, bash is a UNIX shell and command language, which is also a default login shell for many Linux systems and Mac OS. It provides the ability to write scripts to do things programmatically.  Shell scripting is an important skill to become an efficient developer or programmer. It allows you to automate trivial tasks that otherwise take away your valuable time. It also allows you to do things quickly.

How to print all leaf nodes of a Binary Tree in Java without Recursion

In the last article, you have learned how to print all leaf nodes of a binary tree in Java by using Recursion, a useful technique to solve binary tree problems and in this article, we'll answer the same question without using Recursion. Why should we do this? Well, it's a typical pattern on a programming job interview to solve the same problem using both Recursion and Iteration. Since some questions are easy to solve using recursion like linked list problems, binary tree-based problems, tower of Hanoi, or Fibonacci series but their non-recursive solution is comparatively tricky, interviewer test candidates against this shift in the algorithm.

Top 5 Course to learn Internet of Things (IoT) in 2020 - Best of Lot

Hello guys, you might have heard about IoT or Internet of things as its slowly changing the word. But if you are not sure what does IoT means and why you should learn this skill in 2020 then let me give you a brief overview.  The Internet of Things or IoT is any material or machine that has an internet connection other than a general computer that you are using in your daily life or phones and it must have some computational power and some intelligence to be considered as an IoT device such as the cameras and the intelligent refrigerator.

5 Free Oracle and Microsoft SQL Server Online Courses - Best of lot

If you are an application developer, like someone developing a server-side application using Java or .NET or any other programming language which uses a database like Oracle and Microsoft SQL Server or a junior DBA, then you must learn these database technologies to effectively work in your Job. Even though your organization might have DBAs or Database Administrators to help you with the database, more often than not, it's application developers who end up writing SQL scripts to create data, upload data, query data, and writing complex stored procedures and triggers to implement application functionalities. DBAs job mostly does database installation, access control, security, and other database admin stuff.

Top 22 Array Concepts Interview Questions Answers in Java

An array is one of the fundamental data structures and most of the other advanced data structures like list, hash tables are built using arrays.  Good knowledge of fundamental data structures like the array, linked list, a binary tree is not just essential for writing better code but also doing well on Programming Job interviews. Array-based questions are quite popular in Java interviews. There are two types of questions you will find, first which are based upon array implementation in Java and second which are based upon how to use an array data structure to solve some coding problems. The first type of question is quite popular in the telephonic round of Java interview and second is usually asked on written tests and face-to-face interviews.

Top 10 JavaScript Frameworks and Libraries for full stack developers - Best of Lot

There is no doubt that JavaScript is now the #1 programming language in the world and also the king of web development. If you want to become a web developer who can quickly create websites like you see on the internet, then a good knowledge of JavaScript and various, popular JavaScript web development frameworks is essential for you. These framework has completely changed the way people developed web application a decade ago. After node.js, it's even possible to create a complete web application from front-to-back using just one programming language, JavaScript. That's why it has become the preferred programming language of all Full-stack Web Developers.

Top 5 Courses to learn DevOps in 2020 - Best of Lot

Hello guys, you may know that DevOps is one of the most in-demand skills for both big and small organizations. Consequently, DevOps Engineer is also one of the highest-paid technical jobs for people who don't want to go on general jobs like people management or project management. If you are looking for a raise or want to take your career to the next level, learning DevOps and tools like Docker, Kubernetes, Jeninks, and Maven can be a good option.

10 Books Java Developers Should Read in 2020

Hello guys, If you are Java developer and wondering what to read in 2020, then you have come to the right place. In this article, I am going to share 10 books on Java, Spring, and related technology a Java developer can read. I have included books for both experienced Java developer who is more inclined to learn about architecture stuff,  developing for Cloud, MicroService, Java 9 to Java 13 features, and Spring 5 features and thinking of learning Kotlin to improve their productivity. Still, I have not forgotten to junior and less experienced Java developers or some who are thinking of starting their journey into Java world in 2020.

Top 5 Free Docker Courses for Java and DevOps Engineers - Best of Lot

If you are an application developer working in Java or C# or any other language and want to become a DevOps engineer or someone who wants to learn Docker, then you have come to the right place. In this article, I am going to share some of the free Docker courses you can use to take online to learn Docker by yourself. These courses are great for both beginners and intermediate developers who have basic ideas about Docker. If you don't know what a Docker is and how it works, then let me give you a brief introduction. Before starting, just look at the Docker's logo, which is a whale carrying containers, does that strike something? Well, if you add this image with the name Docker, you might think about shipping companies, which move boxes from one part of the world to another.

3 Ways to change Embedded Tomcat Server Port in Spring Boot Application

If you know Spring Boot really simplifies the Java web development by embedding essential libraries as well as a tomcat server to run Java web application. By default, this tomcat server listens on port 4588, and for any reason, if you want to change, then Spring boot provides several configuration options to achieve that. For example, I wanted tomcat to listen on port 8080 because port 80 is forwarded to 8080 in our Linux machine, and we wanted our clients to provide our client with a clean URL without a port.

Top 5 Courses to learn Python for Web Development in 2020 - Best of Lot

Hello guys, Web development is one of the most important skills for software engineers in today's highly connected digital world. If you look around most of the billion-dollar businesses like Google, Amazon, Facebook are all web applications and they are the most successful companies around. There is a huge demand for web developers, particularly with Python and JavaScript skills and in this article, you will learn about the best online courses to become a Web developer using Python Programming language, one of the most popular and versatile languages for coding.

10 Best Data Science and Machine Learning Certifications and Courses for Beginners and Experienced Developers

If you work in the technology field today like you are a programmer or software engineer, then I am sure you have heard about terms like Data Science, Machine Learning, Deep Learning, Artificial Intelligence, etc. They are the latest technologies that are impacting every single sector, just like IT does it when it comes the first time. It doesn't matter if you are working for a bank or insurance sector, airspace, or defense, all fields were impacted by IT, and in the near future, they will be impacted by machine learning and artificial intelligence. That's why it's important to learn Data Science and Machine learning in 2020 and if you are looking for some good resources like courses and certification then you have come to the right place.

Difference between @SpringBootApplication vs @EnableAutoConfiguration annotations in Spring Boot

Even though both @SpringBootApplication and @EnableAutoConfiguration can be used to enable the auto-configuration feature of Spring Boot, there is a subtle difference between them. The @SpringBootApplication does much more than what @EnableAutoConfiguration does. It's actually a combination of three annotations: @Configuration, which is used in Java-based configuration on Spring framework, @ComponentScan to enable component scanning of components you write like @Controller classes, and @EnableAutoConfgiuration itself, which is used to allow for auto-configuration in Spring Boot application.

How to Print all leaf Nodes of a Binary tree in Java - Coding Interview Questions

This is another interesting coding problem which is based on a binary tree and mostly asked beginner programmers. If you have some experience in solving binary tree-based problems then it's rather easy to solve because, like many other binary tree algorithms, you can use recursion to print all leaf nodes of a binary tree in Java. Since the tree is a recursive data structure, you can apply the same algorithm to both the left and right subtree. In order to solve this problem, the first thing you should know is what is a leaf node because if you don't know that then you won't be able to solve the problem. Well, a leaf node is the one who's left and right child nodes are null.

Top 5 courses to learn advanced CSS - Flexbox, Grid, and Sass in 2020 - Best of Lot

Hello guys, along with HTML and JavaScript, CSS is one of the core technologies of the World Wide Web (WWW) and critical skills for anyone who wants to start their career in web design and web development. No website in the modern world is complete without CSS and it is safe to say, no one can become a complete web developer without CSS. CSS stands for Cascading Style Sheets. It is used to define the presentation of a web page. It allows you to create attractive and beautiful web pages. This might sound a little blunt but you cannot become a web developer or full-stack web developer if you do not understand CSS. It's one of the most important skills for a front end developer but also useful for full-stack and backend developers.

Counting Sort in Java - Example

Hello guys, the Counting sort algorithm, like Radix sort and Bucket sort, is an integer-based algorithm (i.e. the values of the input array are assumed to be integers), non-comparison, and linear sorting algorithm. Hence counting sort is among the fastest sorting algorithms around, in theory. It is also one of the few linear sorting algorithms or O(n) sorting algorithm. It's quite common in Java interviews nowadays to ask, whether do you know any O(n) sorting algorithm or not. If you face this question in the future, you can mention Radix sort, Bucket sort, or Counting sort algorithms.

Top 5 Free Apache Spark Course for Java, Scala, and Python Programmers to learn Online

Hello guys, if you are thinking of learning Apache Spark to start your Big Data journey and looking for some excellent free resources, e.g., books, tutorials, and courses, then you have come to the right place. In this article, I am going to share some of the best, free online Apache Spark courses for Java, Scala, and Python developers. If you don't know what is Apache Spark? And Why it's so crucial in the Big Data world, then let me give you a brief overview first. Apache Spark is another cluster computing framework like Hadoop, which is used to analyze a vast data set. Still, it's much faster as compared to Hadoop, which makes it ideal for today's high computing needs, like processing a massive amount of data.

What is the use of ContextLoaderListener in Spring MVC Framework?

The ContextLoaderListner is one of the essential components of the Spring MVC framework, probably the most important after the DispatcherServlet itself. It is used to create the root context and responsible for loading beans, which are shared by multiple DispatcherServlet like beans related to the service layer and data access layer. In general, When you develop Spring MVC based web application and also using Spring in the services layer, you need to provide two application-contexts. The first one is configured using ContextLoaderListener, and the other is set using DispatcherServlet. The DispatcherServlet is responsible for loading web component-specific beans like controllers, view resolvers, and handler mappings while, as I said before, ContextLoaderListener is accountable for loading middle-tier and data-tier beans which forms the back end of Spring applications.

Top 5 courses to learn MEAN stack in 2020 - Best of Lot

Hello guys, the MEAN stack is undoubtfully the most popular software stack in full-stack web development. The demand for full-stack developers has increased tremendously in recent years. MEAN stack comprises a few of the most popular technologies that are widely used. More and more people, especially newcomers want to learn the MEAN stack from scratch. Google is filled with MEAN stack courses and not all of them are worth going for. I have been sharing useful courses to learn modern tech stack like in earlier articles we have seen the best courses to learn MERN stack and  In this article, I will list the top 5 MEAN stack courses that explain every concept nicely and properly.

How to test REST API from Command Line using cURL command in Linux

The curl or cURL command of Linux is a compelling and versatile command which allows you to send sophisticated HTTP request right from your Linux command line window. You can use the cURL command to test your RESTful Web Services by sending GET and POST requests, doing authentication, saving a cookie in the file, etc. The curl command is, in fact, the go-to tool for many Java and Spring developers working in web applications and consuming data from the secured RESTful Web Services. Still, you can also use it to test your simple REST Web APIs without security. I have used it many times to check if our Web service is up or not, or is there any error while accessing those services.

Top 5 Free Courses to Learn Eclipse and JUnit for Java Developers - Best of Lot

Both Eclipse and JUnit are two of the essential tools for Java Developers. Eclipse is a Java IDE, Integrated Development environment which allows you to code, run, and debug Java program from a single window. At the same time, JUnit is a unit testing library which will enable you to test your Java code automatically. You can write JUnit tests, and then you can run them automatically using Maven or Gradle plugin at build time. You can further automate your build using Jenkins, which means your Unit test will run continuously and automatically, reporting any break at the earlier possible opportunity.

Top 10 Algorithm books Every Programmer Should Read

Algorithms are language agnostic, and any programmer worth their salt should be able to convert them to code in their programming language of choice. Unfortunately, I have come across several programmers who are REALLY good on programming languages like Java or Python like knows minor details of API and language intricacies but have very poor knowledge of fundamentals Algorithms and Data Structure. Just ask them to implement any popular sorting algorithms like quicksort or merge sort, and they will fall apart. If you expect them to know more advanced and sophisticated algorithms like String processing algorithms, graph algorithms, tree traversal, or greedy algorithms, be ready to check on Interviews; otherwise, you might end up with some surprises.

Top 5 Data Science and Machine Learning degrees you can earn Online - Best of Lot

Hello guys, I have been sharing some online degree programs you can take online from last a couple of weeks as more and more people are looking for online technical degree programs. Earlier, I have shared Top 5 Computer Science degree you can earn online, and today, I will share the top 5 Data Science and Machine learning degrees you can earn online from the world's reputed universities.  Data Science is the way or the process of extracting insights and useful information from your data to understand different things and turn that data into a story in the shape of graphs and a dashboard that anyone can understand and by using many different programming languages like Python and R. But imagine if you can earn an online degree in this topic, that's what we are covering in this article.

10 Essential JVM Options for a Java Production System

Hello guys, this is a brief guide of appropriate JVM options, which you will often see in production Java systems. As a Java developer, you should know what these JVM options mean, their importance, and how they affect your application. You will find that most of the JVM options are related to heap memory, garbage collection and to log some details, like heap dump, necessary for troubleshooting heap related issues like a memory leak or excessive memory consumption. It's Ok if you don't know these Java virtual machine options yet, but you should be familiar with them, and that's the objective of this article. Btw, how do you find the JVM options your application is using? Well, you can see the startup scripts through which your application is started.

4 Books to learn Java Programming from Scratch in 2020 - Best of lot

I receive half a dozen emails every day asking about which is the best to learn Java from scratch? Which book should I read in 2020 to learn Java? Or Which is the best Java for beginners? When I receive such an email, before giving my recommendation, I ask two questions, first do you have any programming experience? like, Are you coming from C, C++, or Python background? Or you are a fresher with no experience in programming, just a couple of classes on data structure and algorithm and operating system in college.

10 Tools Java Developers Should Learn in 2020 - (UPDATED)

We are just a week or two away to 2020, and many programmers have already started making a good process to their goals for 2020, which is very good, but if you are someone, who is still not sure what to learn in 2020, then you have come to the right place. In the past, I have shared 10 things Java developers to learn in 2020, and last week, I published the top 5 Java Frameworks to learn, but there is one topic that kept coming from my readers.  The question which I have received this week a couple of times form my fellow Java developers and readers is which tools Java programmers should learn in 2020? Or what are some excellent Java tools used in application development? And finally, what should I learn in 2020?

Top 5 Free Courses and Tutorials to Learn C# (C-Sharp) in 2020 - Best of Lot

Many people underestimate the power of C# and never think highly of it when they talk about programming languages. Still, the truth is that C# is one of the popular programming languages of today's world, just behind JavaScript, SQL, and Java on StackOverFlow's Developer Survey for the last a couple of years. There are a lot of jobs and opportunities available for experienced C# developers. It's one of the critical languages for developers working with Microsoft technologies like Windows and SQL Server. It is also one of the most popular programming languages for developing desktop GUI, surpassing Java Swing entirely in the last couple of years. I have seen many big investment banks switched from Swing to C# for their GUI development work.

21 Websites to Learn Coding Skill for FREE

Hello there, if you are someone who is learning programming and coding by yourself and looking for some awesome resources, then you have come to the right place. In this article, I am going to share 21 websites you can use to learn the code for free from the comfort of your office and home.

1. plurasight.com

One of the best websites to learn any technology or IT courses, like programming language like Java, web development framework, like. Spring Framework, Hibernate, etc. It's also now acquired CodeSchool, which earlier allows you to learn web technologies by doing it. I use this website to learn a lot of cool stuff in no time.

Top 21 Java HashMap Interview Questions and Answers

The java.util.HashMap is one of the workhorses of JDK. Along with ArrayList, it is one of the most used classes from Java's collection framework. There is hardly a real-world Java project, where I haven't seen the use of HashMap. It is an implementation of hash table data structure, and it's not a surprise that HashMap is so useful, as someone has rightly said, "if you could have just one data structure, make it a hash table". The hash table data structure allows you to search for a value in O(1) time if you have key. In Java, several implementations of hash table data structure exist like Hashtable, ConcurrentHashMap, LinkedHashMap, etc. but HashMap is your general-purpose map.

Top 5 Advanced Java Courses to Learn Performance, Concurrency, and Memory Management for Experienced Programmers

Hello guys, if you have been doing Java development for few years then you know that Performance is the key for any Java application. As a senior Java developer, one should know how to improve the performance of Java application and understand memory management and garbage collection which often causes the performance in Java application. These are some advanced skills which take some effort to develop. It doesn't come by default even if you are programming in Java for years as most of the people don't touch these topics. Many of them are afraid or take the performance tuning work and always look up to the most senior or brilliant developers in their team.

How to prepare Oracle Certified Master Java EE Enterprise Architect (1z0-807, 1Z0-865, 1Z0-866) - OCMJEA6 Exam

The OCMJEA 6 certification is one of the most difficult, time-consuming, and tiresome Java certifications. Still, it was also the one that made me learn and grow professionally. This certification consists of 5 phases:

Phase 1: Compulsory Course

At this point, the candidate is required to take at least one official Oracle course from Java at any partner company. You can complete this course during certification - before, during, or after.

If you already have experience in Java and architecture, leave to take the course at the end. If not, use the classes to gain knowledge for the test by doing them before. There is a complete grid of Java courses for the candidate to acquire the necessary know-how for this certification.

Top 5 Spring Security Online Training Courses for Java Developers

Security is one of the most important aspects of a modern web application, be it a Java web application, .NET, or writing using any other web technology. In the Java world, Spring Security rule the security space. It's one of the rare frameworks which provided many security features, e.g. authentication, authorization, session management, remember me, and several other useful features out-of-the-box. Since there was no competition for Spring security and it does its job very well, it soon becomes the de-facto standard for implementing security in both Java web applications, REST APIs, and core Java applications. The rise of the Spring framework certainly helps it to cement its place as well.

Top 25 Java Date, Time, and Calendar Interview Questions Answers

The Date and Time API is a very important one for day to day Java development work but many interviewers don't ask enough questions on this topic. Most of the questions are based on either Java Collection framework like  HashMap, ConcurrentHashMap, or ArrayList or on multi-threading concepts like volatile, synchronized, and atomic variables. This is not good and I think many interviewers have realized that a good understanding of date and time API is also important for a good Java developer. That's the main reason for an increasing number of date, time, and calendar-based Java interview questions in recent times, particularly in the last couple of years.

Top 5 Free Angular Courses for Beginners to Learn Online - Best of Lot

Google's Angular is one of the most popular JavaScript frameworks for creating web apps. It helps you in creating complex web applications in less time. It's maintained by Google, so you can also rest assured that this powerhouse of a framework is built with speed and purpose and here for the long run. The Angular Framework is also the most popular framework in the world for developing single-page applications.  The framework was first launched as Angular JS, which allowed building a web application using the Model View Controller concept, and it was hugely popular, but it was later re-written completely, which is now known as simply Angular or Angular 2.

Top 20 System and Software Design Interview Questions for Java Programmers

System design questions are an important part of programming job interviews and if you want to do well, you must prepare this topic. In the past, when I shared my list of programming interview questions, I have shared a couple of System design questions but my readers kept asking me for more questions, as it is a hard topic to master and more and more practice is needed. I had my own list of questions that I have collected from various interviews with friends and colleagues but I needed more questions for this article and my own preparation then I stumbled upon the Grokking System Design Interview course. It's an excellent resource because it not only gives you a lot of System design question but also provide all the knowledge and tools you need to solve those questions.

Top 6 Free Courses to Learn BlockChain Technology in 2020 - Best of Lot

Hello guys, how are you doing? I hope you all are having a great time and working towards your goal this year. I have been sharing a lot of courses and tutorials in this blog about what to learn in 2019, starting from tools to frameworks, from libraries to programming languages, but one of the most critical technology, you can learn in 2019 is the Blockchain technology. It's one of most talked about technology at the moment and considered to be the next big thing after the invention of the internet as they provide a way to attain digital trust on the Internet.

Top 10 Open Source Frameworks and Libraries Java Web Developers Can Learn

Java programming language and platform has been fortunate in terms of frameworks, standards, and libraries, I guess which is one of the important reason for its huge success. Apart from standard frameworks like Swing for desktop GUI application, JavaFX, Servlets and JSP, EJB, and JSF, there are a lot more open-source frameworks and libraries available for Java programmers. These Open source framework, not only helps and speed up development but also enforce to use best practices required to build enterprise Java application and desktop application.

Top 5 Books to become Scrum Master in 2020- Best o fLot

Are you a senior Java developer who wants to become a Scrum Master to advance in your career? Well, at this time, a person needs to wear many hats for job security. You not only have to perform your duty as a Software developer, I mean coding, but also need to support your application as Level 2 or Level 3 Support. You also need to wear project management or product development hat, which involves talking to stakeholders and clients. If this is not enough, you may need to play the role of Scrum master in your daily Scrum meeting and drive your Spring review and Sprint planning meeting. To do all these, you must understand Agile methodologies and how the process works.

Top 5 Books to learn SQL and Database design in 2020 - Best of Lot

The SQL (Structured Query Language) is one of the most essential skills of a programmer. I would rate this skill similar to UNIX if you are a professional programmer because it doesn't matter whether you are Java, C++, or a .NET developer, you are bound to write SQL queries. Since a database is an integral part of any modern Java or Web application, the Interviewer always preferred candidates with excellent SQL skills. Now, the big question comes, how a programmer can learn SQL? Does just knowing how to query a table is enough? If you remember, insert, update, delete, and select, then are you a competent SQL programmer?

Top 5 Online Training Courses to Learn Git for Beginners and Experienced Developers

There is no doubt that both Git and Github have become standard source control and code repository for software developers. There was a time when multiple version control rules the world like CVS, SVN, VSS, Mercury, and TFS, but slowly and for better, everything has converged to Git. Now, almost 70 to 80% programmer uses Git for version control and Github repository, both public and private, for storing their source codes.  When it comes to using a source control tool like SVN or CVS, most of the programmers use them using IDE, like from IntelliJIDEA or Eclipse, and they are hardly familiar with the command line. This is particularly true for old source control software like SVN and CVS, but Git & Github has changed that culture a bit.

Top 5 Amazon Web Services or AWS Courses to Learn Online - FREE and Best of Lot

Hello guys, if you are thinking about learning cloud technologies or cloud computing, and looking at the various cloud providers like AWS, GCP, or Azure, then you are going in the right direction. The future lies with Cloud, and it's essential for every developer to learn about cloud computing solutions. When we talk about Cloud, the first thing that comes in mind is AWS, the biggest Cloud Computing platform, and that's why I suggest a lot of developers learn it. If you want to learn Amazon Web Services, popularly known as AWS, and looking for some excellent resources like books, courses, and tutorials, then you have come to the right place.

12 Must Read Advance Java Books for Intermediate Programmers - Part 1

I often receive loads of email about Java books and courses recommendations, something like, I have 2 years of experience in Java and Spring, which Java books should I read to become an expert Java programmer, or I have 5 years of experience in core Java and want to become a Java expert, which books or courses should I refer? These are just some of the examples, but most of the requests are like that. It's interesting that most of the email I receive is not from beginners, I mean those who want to learn Java from scratch, but, from Java developers who have 2 to 3 years of experience. I call them Intermediate Java programmers because they are in the state of their career where they know how to program in Java, but they are not experts yet.

Top 5 Courses to learn MERN Stack in 2020 - (MongoDB, Express.js, React.js, and Node.js)

The popularity of the MERN stack development has grown significantly in recent years. The MERN stack is one of the two popular JavaScript stacks, along with MEAN stack, and used to develop single-page dynamic web applications.

MERN stands for MongoDB, Express.js, React.js, and Node.js.
  • MongoDB: A popular NoSQL database. It stores data in the JSON format.
  • Express.js: A flexible and minimal web framework for Node.js.
  • React.js: A JavaScript library used to create user-interfaces.
  • Node.js: A runtime environment used to execute JavaScript outside the browser.

Solving org.springframework.beans.factory.BeanCreationException: Error creating bean with name X [Java Spring]

If you are using the Spring framework in your Java application and getting this error during startup it means Spring is not able to initialize the bean X and add into its application context, Why? There could be multiple reasons like a typo on the spring bean name. Let's take a closer look at the stack trace to find out the real reason:

BeanInstantiationException: Could not instantiate bean class [X]: No default constructor found; nested exception is java.lang.NoSuchMethodException: X.()

Here X is the class, which is declared as Spring bean. The error clearly says that the default constructor is not present in class X.

Top 5 Courses to learn Django and Python for Web Development - Best of Lot

Hello guys, you may know that Python is a multi-purpose programming language meaning that you can use it in different fields such as GUI application, artificial intelligence, and web application, and much more, just to name a few. Apart from Data Science, Web development is another area where Python really shines because of its awesome tools, libraries, and frameworks. And, when we talk about web applications, one of the best python frameworks that are popular is the Django framework which allows you to create a Python web application very quickly and easily.

java.lang.ClassNotFoundException: org.Springframework.Web.Context.ContextLoaderListener [Solution]

Problem : You are getting java.lang.ClassNotFoundException : org.Springframework.Web.
Context.ContextLoaderListener in your Spring-based Java Web application.
Cause: This error comes when you are using the Spring MVC framework in your Java Web application and configured org.springframework.web.context.ContextLoaderListener as a listener in your deployment descriptor also known as web.xml, but the JAR which contains this class is not available in web application's CLASSPATH.

Top 5 Free Courses to learn Node.js in 2020 - Best of lot

Node JS has completely changed the way JavaScript is used for development. Earlier JavaScript was considered as a client-side language because it runs on a browser and mostly used for client-side validations, animations, and interaction. Node.js takes that to the next level by allowing JavaScript to run on a server-side, which means you can now write JavaScript applications that can execute without a browser. Node JS uses Google Chrome's execution engine and asynchronous processing to do this. All you need to is include node.js script in your application, and you are ready to create server-side applications in JavaScript, which wasn't possible until a few years back.