public class MyStringTest {                                  //Class name MyStringTest
   
    public static void main(String args[]){

        String s = new String("TEST STRING");      //initializes String instance with a String literal
        String reverseString = new String();            //temp variable to hold reverse string;

        for(int i = s.length()-1; i>-1; i--){                     //using loop structure and length() of string class.
            reverseString += s.charAt(i);                      //using charAt()
        }

        System.out.println(reverseString);
    }

}