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在JDK1.6下写的。
  /** *//**
 * @author 叶俊154560
*
* TODO 多态切换Swing的观感
*
* 程序运行结果：
* 点击不同的按钮，panel变成不同的样式，并加入“窗口适配器”和“窗体状态监听器”
 */
 package PlafTest;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.awt.event.WindowStateListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import SwingTest.GetScreenSize;
public class PlafTest...{
  public static void main(String[] args)...{
MyFrame frame = new MyFrame();
//frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("改变窗体的观感");
frame.setVisible(true);
 }
}
class MyFrame extends JFrame...{
public static int ScreenWidth;
public static int ScreenHeight;
public MyFrame()...{
SetStatus();
MyPanel panel = new MyPanel();
add(panel);
//监听捕捉窗体事件
WindowListener listener = new Terminator(MyFrame.this); //MyFrame.this
addWindowListener(listener);
//监听窗体变化
WindowStateListener stateListener = new StateChange(MyFrame.this); //MyFrame.this
addWindowStateListener(stateListener);
}
public void SetStatus()...{
GetScreenSize getScreenSize = new GetScreenSize();
ScreenWidth = getScreenSize.getScreenWidth();
ScreenHeight = getScreenSize.getScreenHeight();
setSize(ScreenWidth/2, ScreenHeight/2);
setLocation(ScreenWidth/4, ScreenHeight/4);
}
}
class MyPanel extends JPanel...{
public MyPanel()...{
//用getInstalledLookAndFeels获得已经安装在系统上的窗体样式的名字和类名，
//并利用它们创建3个按钮
UIManager.LookAndFeelInfo[] infos = UIManager.getInstalledLookAndFeels();
for(int i=0; i<infos.length; i++)...{
makeButton(infos[i].getName(),infos[i].getClassName());
}
}
void makeButton(String name, String className)...{
JButton myButton = new JButton(name);
add(myButton);
Action myAction = new Action(className,MyPanel.this); //MyPanel.this
myButton.addActionListener(myAction);
}
}
//这里没有作为内部类，而是独立出来处理
class Action implements ActionListener...{
private String plaf;
private JPanel myPanel;
public Action(String className,JPanel myPanel)...{
plaf = className;
this.myPanel = myPanel;
}
//在Action类中实现继承自ActionListener类的抽象方法actionPerformed
public void actionPerformed(ActionEvent event)...{
try...{
UIManager.setLookAndFeel(plaf);
SwingUtilities.updateComponentTreeUI(myPanel);
}
catch(Exception e)...{
e.printStackTrace();
}
}
}
//窗口适配器
class Terminator extends WindowAdapter...{
private MyFrame myFrame;
public Terminator(MyFrame myFrame)...{
this.myFrame = myFrame;
}
public void windowClosing(WindowEvent e)...{
int k = JOptionPane.showConfirmDialog(null, "hello，quit program?","请确定",1);
while(k==0)...{
System.exit(0);
}
}
}
//监听窗体状态改变
class StateChange implements WindowStateListener...{
private MyFrame myFrame;
public StateChange(MyFrame myFrame)...{
this.myFrame = myFrame;
}
public void windowStateChanged(WindowEvent e)...{
int k = e.getNewState();
if ((k==Frame.MAXIMIZED_HORIZ)||(k==Frame.MAXIMIZED_VERT)||
(k==Frame.MAXIMIZED_BOTH)||(k==Frame.ICONIFIED))...{
JOptionPane.showMessageDialog(null, "Sorry，but I will Change it Back!"); //显示一个对话框
myFrame.SetStatus();
}
}
}
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