Java Interview Questions for 2 to 5 Years Experience

In this post, we are going to cover the most frequently asked Java interview questions for a 2 to 5 years experienced Java developer. It contains interview questions not only from common Java topics like arrays, strings, threads, and OOPs but also from Java 8, NIO, Spring Boot, Design Patterns, etc. 

This list contains interview questions suitable for both beginners in Java programming and experienced developers with years of experience.

Java 8 Interview Questions

In this post, we are going to cover some of the most common Java 8 interview questions, along with simple explanations and examples.

Java 8 introduced a lot of new features that changed the way we write code. Understanding these features is important not only for interviews but also for improving your coding skills.

Why String is Immutable in Java with Example

In this post, we are going to learn why the String class is immutable in Java and what that means for developers. We will also look at a simple example to understand this concept better. The question of why String is immutable often gets asked in Java interviews, so knowing about the immutability of strings in detail is important for both Job seekers and experienced Java developers. Let's dive in to understand why Strings in Java are immutable.

Arrays in Java with Coding Examples

In this post, we are going to learn about what is arrays in Java, Syntax for array in Java, How they work, and how it helps us to store multiple elements. We will also go through some simple coding examples to help you understand the concept better.

What is an Array in Java?

An array in Java is a data structure that allows us to store multiple values in a single variable. So Instead of declaring separate variables for each value, we can just create an array to store them all together in a fixed-size list. But in array, we can store only similar type of elements that simply means If we have created an integer array then we are allowed to store only integer type of elements in it and If we try to store other than integer type elements like double or String then we will get an compile time error saying incompatible types.

Strings in Java with Coding Examples

Strings are very important in Java or any other programming language because they are used to store and manipulate text data. We cannot even imagine an application or website without having text on it. In almost every application, we need to work with text data, whether it is accepting input from the user or displaying a message to the user. It is also important to know about Strings and how it works internally if you are preparing for Java interviews. So knowing about Strings in Java is very important for both students and job seekers.

In this tutorial, we will learn what is a String in Java with its different types like String, StringBuffer, and StringBuilder. 

Abstraction in Java with Bank ATM Example

In the previous post we learned what is polymorphism in Java. In this post, we are going to learn about another important concept of OOPs in Java which is Abstraction.

Abstraction in Java simply means hiding certain details from the user and showing only essential information to the user.

• Here is a real-life example of abstraction: Through the ATM machine, banks only show essential information to people, such as withdrawing money and checking account balances, by hiding the internal implementation or mechanism.
• Another real-life example of abstraction is 

Polymorphism in Java with Examples

In the previous post, we learned about what is encapsulation in Java with its examples. In this post, we will learn about polymorphism in Java and how it works. So, without wasting any time, let's get into the discussion.

The term "polymorphism" means having many forms. In simple terms, it refers to the ability of something to exist in different forms or have different behaviors. It allows us to perform a single action in different or multiple ways. 

Here is a real-life example of Polymorphism:

Encapsulation in Java with Examples

In the previous post, we learned what is inheritance in Java with its different types and their examples. In this tutorial, we are going to learn what is encapsulation in Java with its examples.

Encapsulation in Java means binding data and code together into a single unit.

In simple words, Encapsulation is like putting things inside a box and controlling who can access them. In Java, we use classes to create these boxes. Each box (class) has some data (variables) and actions (methods) that can be performed on that data.

Inheritance in Java with Examples

In this tutorial, we are going to learn about what is inheritance in Java with its different types and how to implement each type with coding examples. Learning inheritance in Java is crucial because it is a very important concept of object-oriented programming(OOP). Interviewers often ask interview questions on the inheritance concept in Java to test your knowledge and ability to apply inheritance to solve real-world problems to develop efficient systems.    

Top 15+ OOP's Interview Questions and Answers

In this post, we will learn which interview questions on OOPs (Object-Oriented Programming) are mostly asked in interviews. In OOPs, the questions are usually focused on OOPs concepts like inheritance, abstraction, encapsulation, and polymorphism. There are many questions in object-oriented programming because it is a very important concept and style of programming. That's why interviewers ask most questions on it.

SQL Interview Questions for Freshers

If you want to become a software developer, backend engineer, data analyst, or even work in the data science and AI field, having SQL knowledge is crucial. It is very important to understand databases and how to manage data using SQL, RDBMS, etc. Collecting and managing data is essential for every company, and no software, website, or company operates without collecting data. Data helps them understand their customers, make complex decisions, and improve their products and services.

In this tutorial, I will share some of the most commonly asked SQL interview questions for both freshers and experienced candidates. So, without wasting any time, let's dive in... 

Collections In Java Interview Questions and Answers

In Java interviews, collections are one of the most commonly asked topics by interviewers. There is no chance of giving an interview without facing questions on collections in Java. Collections play a crucial role in managing and organizing data efficiently. Understanding the concepts and usage of Java collections is a must for any Java developer. 

This article will explore some common interview questions related to Java collections and provide comprehensive answers to help you prepare for your next interview. After going through these collection interview questions, you will acquire a solid grounding in Java Collections.

What Is HashMap In Java and How It Works Internally

While working with Java, understanding data is crucial for writing efficiently, effective. Among these structures, the HashMap stands out as a powerful utility that provides fast data retrieval Whether you're a novice learning the ropes or an experienced developer seeking to refresh your knowledge, diving into the inner workings of HashMap can enrich your programming skills. This article will explore what a HashMap is, how it functions internally, and why it is so widely used in Java applications.

30 Advanced Java Interview Questions and Answers

When preparing for Java interviews, it's crucial to focus on Core Java questions. However, preparing for advanced Java questions is equally important. Advanced Java plays a significant role in web application development, so understanding it is very important and essential. In this article, I will share some of the most frequently asked advanced Java interview questions and their answers.

Java and Spring Boot Interview Questions for 3 Years Experience

For every Java developer, it's essential to be well-prepared with knowledge of common Java interview questions before attending an interview. Each day, countless candidates apply for jobs and face interviews, making it the interviewer's responsibility to select the best talent from the pool of job seekers. and As a job seeker, it's your responsibility to be prepared to answer most of the questions asked by the interviewer.

In this article, I am going to share some of the mostly asked Java and Spring boot interview questions for 3 years of experienced Java developers. 

Mostly Asked Spring Interview Questions

In this article, we are going to delve into some of the most frequently asked Spring interview questions along with their answers. As we know spring framework is a very popular framework for developing Java applications, So while giving Java interviews interviewers ask most of the questions on the spring framework. Here, we are not going to make it complicated; rather, we are going to explain these questions with their answers in a nutshell. So that it will help you to easily prepare for the responses you should provide in your Java-related interviews.

Java Basic Interview Questions for Freshers

In this post, we will explore some of the most frequently asked basic Java interview questions. It contains interview questions from different Java topics like strings, threads, servlets, OOPs etc. These questions are easy to answer and it will also enhance your confidence and help you ace your Java interviews.

Java Program to Perform All Arithmetic Operations

In the world of programming, learning basic tasks like adding, mutiplying, deviding two numbers is a starting point for every beginner. So, in this post, we are going to explore how to perform all arithmetic operations using two numbers in Java, with a step-by-step explanation of the program. But before delving into that, you need to understand what the Arithmetic Operators in Java are.

There are total five arithmetic operators in Java as shown in below image:

Java Program to Check Given Number is Even or Odd

In this post, we are going to see two ways to print whether a given number is even or odd in Java. First one is using if-else statements, and another one without using if-else statements, using the ternary operator in Java. So, let's dive into the discussion of how to check whether a given number is even or odd.

Step by Step logic of the given Program:

1. First Create a Scanner class object to accept input from user.
2. Accept input from user and store that in variable called num.

Collections in Java With Hierarchy

Collections in Java provide a way to store and manipulate groups of objects. Think of collections as containers that allow you to efficiently manage, organize, and manipulate data.

In Java, the Collections Framework is a set of interfaces and classes that provide reusable data structures.

Collection Hierarchy: