public class MenuDemo2 {
public static void main(String[] args) {
final Frame f = new Frame();
// 设置窗体属性
f.setTitle("多级菜单");
f.setBounds(400, 200, 400, 300);
//记录以前的标题
final String title = f.getTitle();
// 创建菜单栏
MenuBar mb = new MenuBar();
// 创建菜单
Menu m1 = new Menu("文件");
Menu m2 = new Menu("更改标题");
// 创建菜单项
final MenuItem mi1 = new MenuItem("好好学习");
final MenuItem mi2 = new MenuItem("天天向上");
MenuItem mi3 = new MenuItem("恢复标题");
MenuItem mi4 = new MenuItem("记事本");
MenuItem mi5 = new MenuItem("退出系统");
// 谁添加谁
m2.add(mi1);
m2.add(mi2);
m2.add(mi3);
m1.add(m2);
m1.add(mi4);
m1.add(mi5);
mb.add(m1);
f.setMenuBar(mb);
f.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// 退出系统
mi5.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
// 记事本
mi4.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Runtime r = Runtime.getRuntime();
try {
r.exec("notepad");
} catch (IOException e1) {
e1.printStackTrace();
}
}
});
// 好好学习
mi1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// public String getLabel()
f.setTitle(mi1.getLabel());
}
});
//天天向上
mi2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// public String getLabel()
f.setTitle(mi2.getLabel());
}
});