How to Reverse a String in Java

Reversing a string is a common operation that can be done in multiple ways. Java provides both built-in methods and manual approaches to reverse a string. We can reverse a string using StringBuffer, StringBuilder, iteration, etc. The following are the approaches for reversing a string

• Using StringBuffer class to reverse a strings

• Using toCharArray() and a for loop

Using StringBuffer class to reverse a strings

StringBuffer class is used to create strings that can be changed. Unlike the String class, which is unchangeable, StringBuffer lets you modify the string without making a new object each time.

Example

The following example shows how to reverse a String after taking it from the command line argument. The program buffers the input String using the StringBuffer(String string) method, reverses the buffer, and then converts the buffer into a String with the help of the toString() method

public class StringReverseExample{
   public static void main(String[] args) {
      String string = "abcdef";
      String reverse = new StringBuffer(string).reverse().toString();
      System.out.println("\nString before reverse: "+string);
      System.out.println("String after reverse: "+reverse);
   }
}

Output

String before reverse:abcdef
String after reverse:fedcba

Using toCharArray() and a for loop

The toCharArray() method is used to convert a string into an array of characters. This allows you to access and manipulate each character individually.

Example

The following is an example of reversing a string by using toCharArray() method

import java.io.*;
import java.util.*;
public class HelloWorld {
   public static void main(String[] args) {
      String input = "tutorialspoint";
      char[] try1 = input.toCharArray();
      for (int i = try1.length-1;i >= 0; i--) System.out.print(try1[i]);
   }
}

Output

tniopslairotut