evenodd.java

Java 程序设计教程（第五版）EXAMPLESchap05源码

//********************************************************************
//  EvenOdd.java       Author: Lewis/Loftus
//
//  Demonstrates the use of the JOptionPane class.
//********************************************************************

import javax.swing.JOptionPane;

public class EvenOdd
{
   //-----------------------------------------------------------------
   //  Determines if the value input by the user is even or odd.
   //  Uses multiple dialog boxes for user interaction.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      String numStr, result;
      int num, again;

      do 
      {
         numStr = JOptionPane.showInputDialog ("Enter an integer: ");

         num = Integer.parseInt(numStr);

         result = "That number is " + ((num%2 == 0) ? "even" : "odd");

         JOptionPane.showMessageDialog (null, result);

         again = JOptionPane.showConfirmDialog (null, "Do Another?");
      }
      while (again == JOptionPane.YES_OPTION);
   }
}