java编程—— 多种窗口风格

 //LookAndFeelDemo.java

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

//显示多种风格的窗口

public class LookAndFeelDemo extends JFrame {

public LookAndFeelDemo(){
super("多种风格的窗口"); //调用父类构造函数

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

JMenu menuTheme=new JMenu("窗口风格"); //初始化菜单
JMenuItem itemNative=new JMenuItem("系统平台风格"); //初始化菜单项
JMenuItem itemMotif=new JMenuItem("Motif风格");
JMenuItem itemMetal=new JMenuItem("跨平台风格");
menuTheme.add(itemNative); //增加菜单项
menuTheme.add(itemMotif);
menuTheme.add(itemMetal);
itemNative.addActionListener(new ActionListener(){ //菜单项事件处理
public void actionPerformed(ActionEvent event){
changeLookAndFeel("Native"); //调用方法,改变窗口风格
}
});
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(); //初始化菜单栏
menuBar.add(menuTheme); //增加菜单到菜单栏
setJMenuBar(menuBar); //设置菜单

JPanel panel=new JPanel(); //初始化一个JPanel
panel.setBorder(BorderFactory.createTitledBorder("组件样式")); //设置边界
panel.add(new JTextField("文本框：Look and feel测试 ")); //增加组件到panel上
panel.add(new JCheckBox("粗体"));
panel.add(new JCheckBox("斜体"));
panel.add(new JCheckBox("下划线"));
panel.add(new JButton("确定"));
panel.add(new JButton("退出"));
container.add(panel); //增加panel到容器上

setSize(220,200); //设置窗口尺寸
setVisible(true); //设置窗口可见
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序
}

//改变窗口样式
public void changeLookAndFeel(String type){
try{
if (type.equals("Native")) { //判断来自于哪个菜单项
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //设置界面样式
}
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){ //捕捉错误
ex.printStackTrace(); //输出错误
}
}

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