import java.awt.Dimension;import javax.swing.JColorChooser;import java.awt.Color;import javax.swing.JFrame;import javax.swing.JPanel;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import javax.swing.JButton;import java.awt.FlowLayout; public class JColorChooserDemo implements ActionListener{ public static void main(String[] args) {  JFrame frame = new JFrame ("JColorChooserDemo");  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);  MyPanel panel = new MyPanel();  frame.getContentPane ().add (panel);  frame.pack();  frame.show(); }   public void actionPerformed(ActionEvent e) { }} class MyPanel extends JPanel implements ActionListener{ private JButton button, rgb, red, green, blue; private Color color = new Color (0, 0, 0); public MyPanel() {  button = new JButton ("Get Color");  rgb = new JButton ("RGB: ");  red = new JButton ("Red: ");  green = new JButton ("Green: ");  blue = new JButton ("Blue: ");  button.addActionListener (this);    setPreferredSize (new Dimension (550,250));  setLayout (new FlowLayout (FlowLayout.CENTER, 5,5));  setBackground (color);  add (button);  add (rgb);  add (red);  add (green);  add (blue); }  public void actionPerformed(ActionEvent e) {  color = JColorChooser.showDialog(this, "Choose Color", color);  setBackground (color);  button.setText ("Get again");  rgb.setText ("RGB: " + color.getRGB());  red.setText ("Red: " + color.getRed());  green.setText ("Green: " + color.getGreen());  blue.setText ("Blue: " + color.getBlue()); }}

评论