Reverse string in java.

package program;

import java.util.Scanner;

public class code{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("enter string=");

StringBuilder sb = new StringBuilder(sc.nextLine());

int n = sb.length();

int i=0,j=n-1;

while(i<j){

    char t = sb.charAt(i);

    sb.setCharAt(i,sb.charAt(j));

    sb.setCharAt(j,t);

    i++;

    j--;

}

System.out.println("Reverse string is="+sb);

}  

}