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Reverse String in JAVA

Posted Under: JAVA, Snippets on May 4, 2020
Code snippet to reverse a String in JAVA. There are many ways to achieve this by using a for loop, by using a built in function provided by the JAVA or by using recursion.

Reverse string using for loop

import java.util.*;

public class ReverseString {
    public static void main(String[] args){
        Scanner input = new Scanner (System.in);
        String str = input.next();
        String reverse = "";
        
        for(int i=str.length()-1;; i>=0; i--){
        	reverse += str.charAt(i);
        }
        
        System.out.println(reverse);        
    }
}


Reverse string using Recursion

public class ReverseString  {

    public static void main(String[] args) {
        String str = "Reverse String";
        String reversed = reverseString(str);
        System.out.println("Reversed string: " + reversed);
    }
	
    public static String reverseString(String str)
    {
        if (str.isEmpty())
            return str;
        //Recursion function call
        return reverseString(str.substring(1)) + str.charAt(0);
    }

}


Reverse String using Native Method

public class ReverseString  {
    public static void main(String[] args) {
        String str = "Reverse String";
        String reversed = new StringBuffer(str).reverse().toString();
        System.out.println("Reversed string: " + reversed);
    }
}
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