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.

Approach

  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 {

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

Java Coding Challenges:
  1. Check if the given number is Armstrong Number in Java
  2. Check a number is Prime: Java Coding Problem
  3. Create anagram buckets from a given input array of words
  4. How to reverse a number in Java
  5. pangram checker in java
  6. How to check if the given number is palindrome in Java
  7. Java program to check if two strings are anagrams
See all articles in Java Coding Challenges
Top articles in this category:
  1. Top 50 SDET Java Programming Interview Questions & Answers
  2. Top 15 coding problems for SDET Java Interviews
  3. SDET: Rest Assured Interview Questions
  4. SDET: JUnit interview questions for automation engineer
  5. Write a program to reverse the order of words in a string
  6. Calculate factorial of a number in Java using recursion
  7. Java program to check if two strings are anagrams


Find more on this topic:
SDET Interviews image
SDET Interviews

SDET Java Interview pattern and collection of questions covering SDET coding challenges, automation testing concepts, functional, api, integration, performance and security testing, junit5, testng, jmeter, selenium and rest assured

Last updated 1 week ago


Recommended books for interview preparation:

This website uses cookies to ensure you get the best experience on our website. more info