Frequently Asked Java String Interview Questions and Answers

Master essential Java String interview questions with real explanations, code examples, and interviewer tips. This guide is written for developers preparing for technical interviews or brushing up on core Java skills.

Introduction

The String class in Java is more than just a way to store text — it’s a cornerstone of the language and a favorite subject in interviews. Whether you're a fresher or a working developer, understanding how Java handles strings can help you solve problems efficiently and impress interviewers with depth and clarity.

This guide walks through 20 of the most commonly asked Java String interview questions.

1. What is a String in Java?

In Java, a String is a sequence of characters. But behind the scenes, it's an object of the String class in the java.lang package. Strings are immutable, meaning once you create a String object, you can’t change its contents.

Example:

String name = "Amit";
String city = new String("Delhi");

The first line creates a string literal stored in the string pool, while the second explicitly creates a new object in the heap.

Interview Tip: