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Reverse a string in Java

Java program to reverse a string that a user inputs. The charAt method is used to get individual characters from the string, and we append them in reverse order. Unfortunately, there is no built-in method in the "String" class for string reversal, but it's quite easy to create one.

Java program to reverse a string

import java.util.*;

class ReverseString
{
  public static void main(String args[])
  {
    String original, reverse = "";
    Scanner in = new Scanner(System.in);

    System.out.println("Enter a string to reverse");
    original = in.nextLine();

    int length = original.length();

    for (int i = length - 1 ; i >= 0 ; i--)
      reverse = reverse + original.charAt(i);

    System.out.println("Reverse of the string: " + reverse);
  }
}

Download Reverse string program class file.

Output of program:
Reverse string Java program output

Reverse a string in Java using StringBuffer class

class InvertString
{
  public static void main(String args[])
  {
     StringBuffer a = new StringBuffer("Java programming is fun");
     System.out.println(a.reverse());
  }
}

StringBuffer class contains a method reverse that can be used to reverse or invert an object of its class.