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

public class MyStack {
   private int maxSize;
   private char[] stackArray;
   private int top;
   public MyStack(int s) {
      maxSize = s;
      stackArray = new char[maxSize];
      top = -1;
   }
   public void push(char j) {
      stackArray[++top] = j;
   }
   public char pop() {
      return stackArray[top--];
   }
   public char peek() {
      return stackArray[top];
   }
   public boolean isEmpty() {
      return (top == -1);
   }
   public boolean isFull() {
      return (top == maxSize - 1);
   }
   public static void main(String[] args) {
      MyStack theStack = new MyStack(10);
      String s="abcd";
      for(int i=0;i