displaycolor.java

Java 程序设计教程（第五版）EXAMPLESchap9源码

//********************************************************************
//  DisplayColor.java       Author: Lewis/Loftus
//
//  Demonstrates the use of a color chooser.
//********************************************************************

import javax.swing.*;
import java.awt.*;

public class DisplayColor
{
   //-----------------------------------------------------------------
   //  Presents a frame with a colored panel, then allows the user
   //  to change the color multiple times using a color chooser.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      JFrame frame = new JFrame ("Display Color");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

      JPanel colorPanel = new JPanel();
      colorPanel.setBackground (Color.white);
      colorPanel.setPreferredSize (new Dimension (300, 100));

      frame.getContentPane().add (colorPanel);
      frame.pack();
      frame.setVisible(true);

      Color shade = Color.white;
      int again;

      do 
      {
         shade = JColorChooser.showDialog (frame, "Pick a Color!",
                                           shade);

         colorPanel.setBackground (shade);

         again = JOptionPane.showConfirmDialog (null,
            "Display another color?");
      }
      while (again == JOptionPane.YES_OPTION);
   }
}