Write a Program To Reverse a String In Java

Write a Program To Reverse a String In Java | Reversing a string means reversing the position of characters in the given string. For example:- If the string is “Know” then after reversing, it will become “wonK”. We can perform this operation manually or Java has also provided some built-in or pre-defined method to reverse the string. 

The StringBuilder and StringBuffer class contain a reverse() method to reverse the string. We can use them to solve the problem.

Method prototype in StringBuilder class:- public StringBuilder reverse()

To call the reverse() method of the StringBuilder class on the String type value, we need to convert String into StringBuilder. While creating a StringBuilder object we can pass the string value and it will create a StringBuilder object. On a StringBuilder object, we can call the reverse() method to reverse the string, and after that using toString() we can convert the StringBuilder object to a String object.

public class Main {
   public static void main(String args[]) {
      String string =  "Hello World";

      // convert string to StringBuilder
      StringBuilder sb = new StringBuilder(string);

      // call reverse() function
      sb.reverse();
      
      // store result to String by
      // converting StringBuilder to String
      String reverse = sb.toString();
      
      // display strings
      System.out.println("Original String: " + string);
      System.out.println("Reversed String: " + reverse);
   }
}

Output:-

Original String: Hello World
Reversed String: dlroW olleH

Also see:- Different ways to Reverse a String In Java

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