java技能百炼001 Test

package CH1;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class exercise001 extends JApplet {
 // 定义变量
 private JColorChooser chooser = new JColorChooser();
 private JButton button = new JButton("Show Color Chooser");
 private JDialog dialog;
 // 初始化程序
 public void init() {
  // 制作界面容器
  Container contentPane = getContentPane();
  contentPane.setLayout(new FlowLayout());
  contentPane.add(button, BorderLayout.CENTER);
  // 选择框
  chooser.setPreviewPanel(new PreviewPanel());
  // 时间监听
  button.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    if (dialog == null)
     dialog = JColorChooser.createDialog(exercise001.this,
       "Pick A Color", false, chooser, null, null);
    dialog.setVisible(true);
   }
  });
 }
 // 制作预览面板
 class PreviewPanel extends JPanel {
  public PreviewPanel() {
   setPreferredSize(new Dimension(0, 100));
   setBorder(BorderFactory.createRaisedBevelBorder());
  }
  public void paintComponent(Graphics g) {
   Dimension size = getSize();
   g.setColor(getForeground());
   g.fillRect(0, 0, size.width, size.height);
  }
 }
}