Write a program to reverse a string using recursion in Java

Carvia Tech | May 18, 2019 | 1 min read | 241 views | Java Coding Challenges

In this article, we will write a program to reverse a string entered by a user.


  1. We will remove first character from the input string and append it at the end.

  2. Repeat it till all the characters are removed and input becomes empty.

Java source

Reverse a string using Recusion Java
public class ReverseString {

    public String reverse(String input) {
        if (input.isEmpty()) {  (1)
            System.out.println("String is empty now");
            return input;
        return reverse(input.substring(1)) + input.charAt(0);   (2)
1 Base condition in recursion
2 Tail recursion

JUnit testcase

We can write a simple Junit based testcase to assert the correctness of our given program.

JUnit testcase

import org.junit.Test;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.*;

public class ReverseStringTest {

    public void reverse() {
        ReverseString utils = new ReverseString();
        assertThat(utils.reverse("carvia"), equalTo("aivrac"));

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