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Core Java

Core Java Interview Questions with Detailed Answers

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Here in this section we will see Core Java Interview Questions and answers which will be valuable for any type of interview in Java Programming Language. I am sure that you will find some unique questions that you may rarely see in other sources. Moreover, you will find clear explanations of the answers to each question. When you go through the answers you will find that while answering the questions related new terms are also explained. If you need any other question to be added here, don't hesitate to put your notes in the comment section. Why are the Java primitive data types not objects? Why is Java not a pure Object-Oriented programming Language? Objects always consume more memory than primitives. If

Record vs. Lombok

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Every Java developer attempts to reduce the boilerplate code whenever it is possible. Undoubtedly, the new JDK versions and even modern frameworks like Spring, Spring Boot have already contributed much to make it possible. In this matter, Records in Java 16 and Lombok library are also known to reduce boilerplate code. Java 16 Records are a native language feature introduced in Java 16. Lombok is a third-party library that provides annotations to eliminate repetitive common tasks. In this detailed comparison 'Record vs. Lombok', we will explore the definition, syntax, usage, advantages, disadvantages, and practical examples of Java 16 Records and Lombok, and compare them based on various parameters. Let's start with what is Record and what is Lombok. Record vs. Lombok: Purpose, Usage,

Java Testing Frameworks

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A Comprehensive Guide to Java Testing Frameworks Testing in Java applications is an essential part of the software development process It plays a vital role in reliability, code quality, and the complete success of the application. There are various testing frameworks that make testing easier for developers & testers. These frameworks provide systematic conditions that allow developers to write, organize, and execute tests in a structured manner. Their primary purpose is to validate the correctness, functionality, and performance of the code under diverse conditions. A Comprehensive Guide to Java Testing Frameworks These frameworks facilitate different types of testing methodologies. For example, Unit testing focuses on verifying the smallest parts of an application, such as individual methods or classes. On the other hand, Integration testing

Java 17 Features

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Undoubtedly, the demand of Java 17 features became crucial after the release of Spring Boot 3.0. Needless to say, the use of Java 17 has become mandatory since Spring Boot 3.0. It also means that every Java developer should be aware of the new changes introduced in Java 17. Java 17 comes with several new features and enhancements that aim to improve developer productivity and program efficiency. In this article, we will explore some of the most significant Java 17 features, with code examples to help you understand how to use them effectively. Java 17 is an LTS (Long-term support) release of the Java programming language. As it is an LTS version, it will receive prolonged support and security updates for

Java 8 Coding Interview Questions

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In this article, We will discuss about Java 8 Coding Interview Questions and their Answers. Moreover, we will try to provide multiple approaches to solve a coding problem. Additionally, related concepts to a particular coding problem will also be discussed. Our primary focus of this article is to provide all important Java 8 Coding Interview Questions and their Answers. However, for theoretical questions & answers of Java 8 Interview, kindly visit our other article 'Java 8 Concept Based Interview Questions & Answers. Java 8 Coding Interview Questions In the subsequent sections of this article, we will discuss the important coding questions using Java 8 or higher versions. If you want to go through detailed tutorial on Java 8 Features, you may visit

Java 22 New Features With Examples

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Java Development Kit 22, the next version of Java Standard Edition, is now available as a production release on March 19, 2024. Java 22 comes with 12 significant features including seven preview features and one incubator feature. It is inclined to improve developer productivity and program efficiency. In this article, we will explore some of the most essential developer’s friendly Java 22 new features with examples. Java 22 New Features With Examples Let's start going through Java 22 New Features with examples one by one. Unnamed Variables & Patterns (JEP 456) This was introduced in Java 21 as a preview feature under the name "Unnamed Patterns and Variables", and now it is finalized in Java22 as "Unnamed Variables & Patterns" without any changes. Many a

Method Reference in Java 8 [::]

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Method Reference is a wonderful feature introduced in Java 8.  Apart from taking advantage of functional programming, one of the biggest advantages in using a Lambda expression is to minimize the lines of code. Similarly, Method Reference in Java 8 [::] also minimizes lines of code even more than Lambda. However, we use both of them in the presence of functional interfaces only. Moreover, It is also a concise and simpler form of lambda expression. In this article, we will also learn how to change a Lambda expression into a method reference. Let's start discussing about 'Method Reference in Java 8 [::]' and it's related concepts.​ What is Method Reference(::)? As we have seen in Lambda expression topic that we use lambda expressions

Improvements In Java Collection API

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In this article "Improvements in Java Collection API" we will learn about the origin of classes in different versions of jdk. Also, If any new class or interface introduced, what was the purpose of introducing that? What was the weakness of previous version of it? Why the new class/interface introduced? What all new features introduced in Collection classes/interfaces? and so on. We are going to discuss about these kinds of questions in this article accordingly. In fact, we will learn about Enhancement of java collection classes step by step & also version by version simultaneously. Primarily, we will focus on Java collection features in JDK 1.0, 1.2, 1.4, 1.5, 1.6 and 1.8, 9 10, 11, 21 respectively. Improvements in Java Collection

Singleton Class In Java With Examples: A Comprehensive Guide

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In this article, we will explore the concept of Singleton class in Java, with different implementation techniques, their advantages and disadvantages, and provide various code examples to demonstrate their utilization. In Java programming, the concept of Singleton class comes from the Singleton design pattern which is one of the most commonly used design patterns in Java. It comes under the category of creational design patterns and is used to ensure that a class has only one instance and provides a global point of access to that instance. What is a Singleton class in Java? A class that can have only one instance (object) at any given time during the runtime of an application. It provides a global point of access to this instance,

Static Keyword In Java With Examples and Best Practices

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The understanding of static keyword in java is so important that we as a java programmer cannot imagine a single runnable program without a static keyword. If we want to run a small program, we must use either main() method (which is static) or a static variable/block till JDK 1.6. Even we don't have the static variable/block option to run the program starting JDK 1.7 onward. Therefore, we should know all about the static keyword and keep in mind the significance of 'Static in Java'. We as a Java developer can't leave the static keyword untouched. Hence, we should have a clear understanding of static in java mandatorily. Additionally, the static keyword in java is an important topic in the interview

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