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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//右键弹出菜单
public class JPopMenuDemo extends JFrame {
JRadioButtonMenuItem items[]; //菜单项
Color[] colors={Color.blue,Color.pink,Color.yellow,Color.red,Color.orange}; //颜色数组
JPopupMenu popupMenu; //弹出菜单
public JPopMenuDemo()
{
super( "右键弹出菜单" ); //调用父类构造函数
ChangeColorAction action = new ChangeColorAction(); //菜单项事件处理
String[] str = {"Blue","Pink","Yellow","Red","Orange"}; //菜单项名称
ButtonGroup colorGroup=new ButtonGroup(); //实例化按钮组
popupMenu=new JPopupMenu(); //实例化弹出菜单
items=new JRadioButtonMenuItem[5]; //初始化数组
for (int i=0;i<items.length;i++) {
items[i]=new JRadioButtonMenuItem(str[i]); //实例化菜单项
popupMenu.add(items[i]); //增加菜单项到菜单上
colorGroup.add(items[i]); //增加菜单项到按钮组
items[i].addActionListener(action); //菜单项事件处理
}
addMouseListener(new MouseAdapter(){ //窗口的鼠标事件处理
public void mousePressed( MouseEvent event ) { //点击鼠标
triggerEvent(event); //调用triggerEvent方法处理事件
}
public void mouseReleased( MouseEvent event ) { //释放鼠标
triggerEvent(event);
}
private void triggerEvent(MouseEvent event) { //处理事件
if (event.isPopupTrigger()) //如果是弹出菜单事件(根据平台不同可能不同)
popupMenu.show(event.getComponent(),event.getX(),event.getY()); //显示菜单
}
});
getContentPane().setBackground(Color.white); //窗口的默认背景色为白色
setSize(230,160); //设置窗口大小
setVisible(true); //设置窗口为可视
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); //关闭窗口时退出程序
}
class ChangeColorAction implements ActionListener { //菜单项事件处理
public void actionPerformed(ActionEvent event) {
for (int i=0;i<items.length;i++)
if (event.getSource()==items[i]) { //判断事件来自于哪个菜单项
getContentPane().setBackground(colors[i]); //设置窗口背景
repaint(); //重绘窗口
return;
}
}
}
public static void main( String args[]) {
new JPopMenuDemo();
}
}