enternumbers.java

《A first book of java》by Gary J.Bronson 北大出版社

import javax.swing.*;
public class EnterNumbers
{
  public static void main(String[] args)
  {
    String s1, outMessage;
    
    final int MAXNUMS = 4;
    int count;
    double num;
    outMessage = "This program will ask you to enter "
             + MAXNUMS + " numbers.";
    JOptionPane.showMessageDialog(null, outMessage, "Program 5.5", 
                    JOptionPane.INFORMATION_MESSAGE);
    count = 1;
    while (count <= MAXNUMS)
    {
      s1 = JOptionPane.showInputDialog("Enter number " + count + ":");
      num = Double.parseDouble(s1);
      JOptionPane.showMessageDialog(null, "The number entered is " + num, 
                                    "Program 5-5", 
                                    JOptionPane.INFORMATION_MESSAGE);
      count++;
    }
    System.exit(0);  
  }
}