菜单栏组件的使用

/**
 *
 */
package JavaGUI;
/**
 * @author:Flying Fire
 * @date:2011-6-18
 * @time:上午09:51:14
 */
/**
 * 学习JMenu的使用方法
 *
 */
import java.awt.event.ActionEvent;

import javax.swing.*;

public class JMenuTest extends JFrame implements java.awt.event.ActionListener{

 //显示主界面
 public void showFrame(){
  this.setTitle("JMenu测试用例");
  this.setSize(400,400);
  this.setLayout(new java.awt.FlowLayout());
  //添加菜单栏
  this.setJMenuBar(createMB());
  this.setDefaultCloseOperation(3);
  this.setLocationRelativeTo(null);
  this.setVisible(true);
 }
 //创建JMenuBar对象，并将其返回
 public JMenuBar createMB(){
  JMenuBar menuBar=new JMenuBar();
     JMenu menu1 =new JMenu("文件");
     JMenuItem item1=new JMenuItem ("打开");
     JMenuItem item2=new JMenuItem("保存");
     JMenuItem item3=new JMenuItem("退出");
     menu1.add(item1);
     menu1.add(item2);
     menu1.add(item3);
    
     item1.setActionCommand("open");
     item2.setActionCommand("save");
     item3.setActionCommand("exit");
     item1.addActionListener(this);
     item2.addActionListener(this);
     item3.addActionListener(this);
   
    
     JMenu menu2 =new JMenu("格式");
     JMenuItem item4=new JMenuItem ("字体");
     JMenuItem item5=new JMenuItem("颜色");
     JMenuItem item6=new JMenuItem("大小");
     menu2.add(item4);
     menu2.add(item5);
     menu2.add(item6);
    
     item4.setActionCommand("font");
     item5.setActionCommand("color");
     item6.setActionCommand("size");
     item4.addActionListener(this);
     item5.addActionListener(this);
     item6.addActionListener(this);
     menuBar.add(menu1);
     menuBar.add(menu2);
      return menuBar;
 }
 //创建JPopupMenu对象，并将其返回
 public JPopupMenu createPM(){
  JPopupMenu pm=new JPopupMenu();
     JMenuItem item1=new JMenuItem ("打开");
     JMenuItem item2=new JMenuItem("保存");
     JMenuItem item3=new JMenuItem("退出");
     pm.add(item1);
     pm.add(item2);
     pm.add(item3);
    
     item1.setActionCommand("open");
     item2.setActionCommand("save");
     item3.setActionCommand("exit");
     item1.addActionListener(this);
     item2.addActionListener(this);
     item3.addActionListener(this);
        return pm;
 }
 
 //监听器
 public void actionPerformed(ActionEvent e){
  String command =e.getActionCommand();
  if(command.equals("open")){
   System.out.println("触发了"+command);
  }else if(command.equals("save")){
   System.out.println("触发了"+command);
  }else if(command.equals("exit")){
   System.out.println("触发了"+command); 
  }else if(command.equals("font")){
   System.out.println("触发了"+command);
  }else if(command.equals("color")){
   System.out.println("触发了"+command);
  }else if(command.equals("size")){
   System.out.println("触发了"+command);
  }
  
 }
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  JMenuTest mt=new JMenuTest();
  mt.showFrame();

 }

}