testingshort.java

java的书上例子

//例12_16    创建菜单的快捷方式
import java.awt.*;
import java.awt.event.*;
public class TestingShort {
   private Frame f;
   private MenuBar mb;
   private Menu m1,m2,mhelp;
   private MenuItem mi11,mi12,mi13,mi21,mih;
   CheckboxMenuItem mi22; 
    
public TestingShort(){
    f=new Frame("Testing Frame");
    mb=new MenuBar();
    m1=new Menu("文件");
    m2=new Menu("编辑");
    mhelp=new Menu("帮助");
MenuShortcut s11=new MenuShortcut('N'), //ctrl+’n’和ctrl+’N’都会响应
             s12=new MenuShortcut('O'),
                 s13=new MenuShortcut('S'),
                 s21=new MenuShortcut('F'),
                 s22=new MenuShortcut('H');
    mi11=new MenuItem("新建",s11);
    mi12=new MenuItem("打开",s12);
    mi13=new MenuItem("保存",s13);
    mi21=new MenuItem("查找",s21);
    mih =new MenuItem("帮助文件",s22);
    mi22=new CheckboxMenuItem("工具");  //复选框菜单项
    m1.add(mi11);
    m1.add(mi12);
    m1.add(mi13);
    m1.addSeparator();  //菜单项之间加上分隔线
    m2.add(mi21);
    m2.add(mi22);
    m1.add(m2);
    f.setMenuBar(mb);
    mb.add(m1);
    mhelp.add(mih);       
    mb.setHelpMenu(mhelp);  //设置帮助菜单
    MyListener ml=new  MyListener(); //生成监听器实例对象
    mi11.addActionListener(ml);  // 注册监听器
    mi12.addActionListener(ml);
    mi13.addActionListener(ml);
    mi21.addActionListener(ml);
mi22.addActionListener(ml);
mih.addActionListener(ml);    
    f.setSize(200,200);
    f.setVisible(true);
}
public static void main(String args[])
{ TestingShort tm=new TestingShort();
}
class MyListener implements ActionListener{   
     public void actionPerformed(ActionEvent e){
     MenuItem i=(MenuItem)e.getSource();
     System.out.println(i.getLabel());
     System.out.println(i.getShortcut());
}
}
}