package tmp;
import java.awt.*;
import java.awt.event.*;

class TestMenuBar extends Frame{
    
    MenuBar mb = new MenuBar();
    
    Menu fileM = new Menu("File");
    Menu editM = new Menu("Edit");
    Menu toolsM = new Menu("Tools");
    Menu helpM = new Menu("help");
    
    MenuItem file1 = new MenuItem("New");
    MenuItem file2 = new MenuItem("Open");
    MenuItem file3 = new MenuItem("Save");
    
    Menu file4 = new Menu("Print");
    MenuItem file41 = new MenuItem("preview");
    MenuItem file42 = new MenuItem("setting");
    
    CheckboxMenuItem cm = new CheckboxMenuItem("Quit",true);
    
    Menu one = new Menu("one");
    Menu two = new Menu("Two");
    Menu three = new Menu("Three");
    MenuItem four = new MenuItem("Four");
    
    public TestMenuBar(){
        mb.add(fileM);
        mb.add(editM);
        mb.add(toolsM);
        mb.add(helpM);
        
        file4.add(file41);
        file4.add(file42);
        AL A = new AL();
        file41.addActionListener(A);
        file42.addActionListener(A);
        four.addActionListener(A);
        
        three.add(four);
        two.add(three);
        one.add(two);
        
        fileM.add(file1);
        fileM.add(file2);
        fileM.add(file3);
        fileM.add(file4);
        fileM.addSeparator();
        fileM.add(cm);
        fileM.add(one);
        
        
        this.setMenuBar(mb);
        
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                dispose();
                System.exit(0);
            }
        });
    }
    public static void main(String arga[]){
        TestMenuBar tmb = new TestMenuBar();
        tmb.setSize(500,350);
        tmb.setVisible(true);
    }
}

class AL implements ActionListener{
    public void actionPerformed(ActionEvent e){
        if (e.getActionCommand().equals("preview")){
            System.out.println("Preview");
        }  else if (e.getActionCommand().equals("setting")){
            System.out.println("Setting");
        }  else if (e.getActionCommand().equals("four")){  // 这里将four改成Four也不行 ？
            System.out.println("Four");
        }
    }
}