// DiffSquaresSwing.java: show the difference of two squares 

import javax.swing.JOptionPane;

class DiffSquaresSwing {
  static int inputNumber(String message) {
      int result;
      String input;
      // Get a string from the user
      input = JOptionPane.showInputDialog(null, message);
      // Convert it to an integer
      result = Integer.parseInt(input);
      // Return the result
      return result;
  }

  static int diffSquares(int a, int b) {
      int sum;
      int diff;
      sum = a + b;
      diff = a - b;
      return sum * diff;
  }

  public static void main(String[] args) {
      int x;
      int y;

      x = inputNumber("First number:");
      y = inputNumber("Second number:");

      JOptionPane.showMessageDialog(
             null, "The difference of squares is: " + 
	           diffSquares(x,y),
	     "Result of difference of squares",
	     JOptionPane.PLAIN_MESSAGE);

      System.exit(0);
  }
}