Reverse string Builder without using library function in java.

 import java.util.*;

public class code

{

    public static void main(String[] args) {

    Scanner sc=new Scanner(System.in);

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

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

      int n=sb.length();

      for(int i=0; i<n/2; i++){

        char temp=sb.charAt(i);

        sb.setCharAt(i,sb.charAt(n-1-i));

        sb.setCharAt(n-1-i,temp);

      }

      System.out.println("reverse string Builder is=");

      System.out.println(sb);

      }

}

output->

enter a string Builder= ved reverse string Builder is= dev