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import java.awt.Button;

import java.awt.Dialog;

import java.awt.FileDialog;

import java.awt.FlowLayout;

import java.awt.Frame;

import java.awt.Label;

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.BufferedWriter;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

public class Demo3 {

private Frame frame;

private MenuBar bar;

private Menu m;

private MenuItem m_save;

private MenuItem m_open;

private MenuItem m_close;

private TextArea ta;

private FileDialog fd;

private Dialog dialog;

private FileDialog fd_save;

private MenuItem m_baocun;

private File file_f;

public Demo3(){

Init();

}

public void Init(){

frame =new Frame("my

window");

frame.setBounds(400, 70, 500,

600);

bar=new MenuBar();

m=new Menu("文件");

m_open=new

MenuItem("打开");

m_close=new

MenuItem("退出");

m_baocun=new

MenuItem("保存");

m_save=new

MenuItem("另存为");

ta=new TextArea();

bar.add(m);

m.add(m_open);

m.add(m_baocun);

m.add(m_save);

m.add(m_close);

frame.add(ta);

myEvent();

frame.setMenuBar(bar);

frame.setVisible(true);

}

public void myEvent(){

//保存事件

m_baocun.addActionListener(new

ActionListener() {

@Override

public void

actionPerformed(ActionEvent e) {

//

TODO Auto-generated method stub

if(ta.getText().equals("")){

dialog=new

Dialog(frame, "错误");

dialog.setLayout(new

FlowLayout());

Button

button=new Button("确定");

dialog.setBounds(520,

280, 250, 100);

Label

lab = new Label("下面的文本框中没有要输入的值!!!");

dialog.add(lab);

dialog.add(button);

dialog.setVisible(true);

dialog.addWindowListener(new

WindowAdapter() {

public

void windowClosing(WindowEvent e){

dialog.setVisible(false);

}

});

button.addActionListener(new

ActionListener() {

@Override

public

void actionPerformed(ActionEvent e) {

//

TODO Auto-generated method stub

dialog.setVisible(false);

}

});

}else

if(file_f==null){

fd_save=new

FileDialog(frame, "另存为", FileDialog.SAVE);

fd_save.setVisible(true);

String

filePath=fd_save.getDirectory();

String

file=fd_save.getFile();

file_f=new

File(filePath, file);

try

{

BufferedWriter

bw=new BufferedWriter(new FileWriter(file_f));

bw.write(ta.getText());

bw.flush();

bw.close();

}

catch (IOException e1) {