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

//顯示多種風格的窗口

public class LookAndFeelDemo extends JFrame {

   public LookAndFeelDemo(){
     super("多種風格的窗口");  //調用父類構造函數

     Container container=getContentPane();  //得到容器

	 JMenu menuTheme=new JMenu("窗口風格");  //初始化菜單
     JMenuItem itemNative=new JMenuItem("系統平臺風格");  //初始化菜單項
     JMenuItem itemMotif=new JMenuItem("Motif風格");
     JMenuItem itemMetal=new JMenuItem("跨平臺風格");
     menuTheme.add(itemNative);  //增加菜單項
     menuTheme.add(itemMotif);
     menuTheme.add(itemMetal);
     itemNative.addActionListener(new ActionListener(){  //菜單項事件處理
     	public void actionPerformed(ActionEvent event){
     		changeLookAndFeel("Native");  //調用方法,改變窗口風格
        }
     });
     itemMotif.addActionListener(new ActionListener(){
     	public void actionPerformed(ActionEvent event){
     		changeLookAndFeel("Motif");
        }
     });
     itemMetal.addActionListener(new ActionListener(){
     	public void actionPerformed(ActionEvent event){
     		changeLookAndFeel("Metal");
        }
     });

     JMenuBar menuBar=new JMenuBar();  //初始化菜單欄
     menuBar.add(menuTheme);  //增加菜單到菜單欄
     setJMenuBar(menuBar);  //設置菜單

     JPanel panel=new JPanel();  //初始化一個JPanel
     panel.setBorder(BorderFactory.createTitledBorder("組件樣式"));  //設置邊界
     panel.add(new JTextField("文本框：Look and feel測試 "));  //增加組件到panel上
     panel.add(new JCheckBox("粗體"));
     panel.add(new JCheckBox("斜體"));
     panel.add(new JCheckBox("下劃線"));
     panel.add(new JButton("確定"));
     panel.add(new JButton("退出"));
     container.add(panel);  //增加panel到容器上

     setSize(220,200);  //設置窗口尺寸
     setVisible(true);  //設置窗口可見
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  //關閉窗口時退出程序
   }

   //改變窗口樣式
   public void changeLookAndFeel(String type){
      try{
		 if (type.equals("Native")) {  //判斷來自于哪個菜單項
		 	UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());  //設置界面樣式
		 }
		 else if (type.equals("Motif")) {
			UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
		 }
		 else if (type.equals("Metal")) {UIManager.setLookAndFeel(
			UIManager.getCrossPlatformLookAndFeelClassName());
		 }
		 javax.swing.SwingUtilities.updateComponentTreeUI(this);  //更新界面
	 }
	 catch(Exception ex){  //捕捉錯誤
       ex.printStackTrace();  //輸出錯誤
     }
   }

   public static void main(String[] args){
      new LookAndFeelDemo();
   }
}