1 import java.io.*;
  2
  3
  4 class stackString
  5 {
  6     private int maxSize;
  7     private char[] stackX;
  8     private int top;
  9
 10     public stackString(int s)
 11     {
 12         maxSize = s;
 13         stackX = new char[maxSize];
 14         top = -1;
 15     }
 16     public void push(char j)
 17     {
 18         stackX[++top] = j;
 19     }
 20     public char pop()
 21     {
 22         return stackX[top--];
 23     }
 24     public char peek()
 25     {
 26         return stackX[top];
 27     }
 28     public boolean isEmpty()
 29     {
 30         return (top == -1);
 31     }
 32     public boolean isFull()
 33     {
 34         return (top == maxSize - 1);
 35     }
 36 }
 37 class Reverser
 38 {
 39     private String input;
 40     private String output;
 41
 42     public Reverser(String in)
 43     {
 44         input = in;
 45     }
 46     public String doRev()
 47     {
 48         int stackSize = input.length();
 49         stackString stackStringRev = new stackString(stackSize);
 50
 51         for(int i = 0; i < stackSize; i++)
 52         {
 53             char charInString = input.charAt(i);
 54             stackStringRev.push(charInString);
 55         }
 56         output = "";
 57         while(!stackStringRev.isEmpty())
 58         {
 59             char ch = stackStringRev.pop();
 60             output = output + ch;
 61         }
 62         return output;
 63
 64     }
 65
 66 }
 67 public class StackApp {
 68
 69     /**
 70      * @param args
 71      */
 72     public static void main(String[] args) throws IOException {
 73         // TODO Auto-generated method stub
 74         String input, output;
 75
 76         while(true)
 77         {
 78             System.out.print("Enter a string: ");
 79             System.out.flush();
 80             input = getString();
 81             if(input.equals(""))
 82                 break;
 83
 84             Reverser testStringRev = new Reverser(input);
 85             output = testStringRev.doRev();
 86             System.out.println("Reversed : " + output);
 87
 88
 89         }
 90
 91     }
 92     public static String getString() throws IOException
 93     {
 94         InputStreamReader isr = new InputStreamReader(System.in);
 95         BufferedReader br = new BufferedReader(isr);
 96         String s = br.readLine();
 97         return s;
 98
 99     }
100
101 }