window 窗口编辑

 package com.chuangkohua;

 import java.awt.FileDialog;
 import java.awt.FlowLayout;
 import java.awt.Frame;
 import java.awt.Menu;
 import java.awt.MenuBar;
 import java.awt.MenuItem;
 import java.awt.TextArea;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;

 public class Menus {

     public static void main(String[] args) {
         // TODO Auto-generated method stub
         Demo3 demo3 = new Demo3();
         demo3.init();

     }

 }

 class Demo3{
     private Frame frame;
     private TextArea area;
     private MenuBar bar;
     private Menu menu,submenu,submenu2;
     private MenuItem item,saveitem,item2,item3,item4,item41,item5,subitem;
     private FileDialog dialog,dialog2;

     public void init(){
         frame = new Frame("我的电脑");
         frame.setBounds(, , , );
         frame.setLayout(new FlowLayout());
         area = new TextArea();
         bar = new MenuBar();
         menu = new Menu("文件");
         submenu = new Menu("子菜单");
         subitem = new MenuItem("子条目");
         item = new MenuItem("关闭");
         item2 = new MenuItem("打开");
         saveitem = new MenuItem("保存");
         //利用关闭选项关闭对话框
         item.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 // TODO Auto-generated method stub
                 System.exit();
             }
         });

         Menu menu1 = new Menu("编辑");
         item3 = new MenuItem("复制");
         submenu2 = new Menu("粘贴");
         item4 = new MenuItem("仅粘贴文字");
         item41 = new MenuItem("粘贴格式文字");

         Menu menu2 = new Menu("查看");
         item5 = new MenuItem("放大");

         dialog = new FileDialog(frame, "保存", FileDialog.SAVE);
         saveitem.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 // TODO Auto-generated method stub
                 dialog.setVisible(true);
             }
         });

         dialog2 = new FileDialog(frame, "打开", FileDialog.LOAD);
           item2.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 // TODO Auto-generated method stub
                 dialog2.setVisible(true);
                 String dirpath = dialog2.getDirectory();
                 String filename = dialog2.getFile();
                 if(dirpath==null||filename==null){
                     return;
                 }else{
                     area.setText("");;
                     File file = new File(dirpath, filename);
                     try {
                         BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
                         String str =null;
                         while((str = bufferedReader.readLine())!=null){
                             area.append(str+"\r\n");
                         }
                         bufferedReader.close();
                     } catch (FileNotFoundException e1) {
                         // TODO Auto-generated catch block
                         e1.printStackTrace();
                     } catch (IOException e2){
                         e2.printStackTrace();
                     }

                 }
             }
         });
         //文件菜单
         submenu.add(subitem);
         menu.add(submenu);
         menu.add(item2);
         menu.add(item);
         menu.add(saveitem);
         //编辑菜单
         submenu2.add(item4);
         submenu2.add(item41);
         menu1.add(item3);
         menu1.add(submenu2);
         //查看菜单
         menu2.add(item5);

         bar.add(menu);
         bar.add(menu1);
         bar.add(menu2);

         frame.setMenuBar(bar);
         frame.add(area);
         frame.setVisible(true);

         frame.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e){
                 System.exit();
             }
         });
     }
 }