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(300, 100, 500, 600);
        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(0);
            }
        });
        
        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+"
");
                        }
                        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(0);
            }
        });
    }
}