Printing reverse of any String without using any predefined function?

Question

How to print the reverse of the String java is object orientated language without using any predefined function like reverse()?

Answer 1

private void rev() {
    String st="hello";
    String b="";

    for(int i=st.length()-1;i>=0;i--){
        b=b+st.charAt(i);
    }

    System.out.println("reverse:::"+b);
}