记事本代码

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import java.io.BufferedReader;

public class TextMenu extends Frame implements ActionListener {

MenuBar mb;

Menu m1,m2,m3,m4,m5,m6;

MenuItem mi11,mi12,mi13,mi14,mi15;

MenuItem mi21,mi22;

MenuItem mi31,mi32;

MenuItem mi41,mi42;

FileDialog fd,fd1;

TextArea ta;

String file="";

public TextMenu(){

super("记事本");

mb=new MenuBar();

m1=new Menu("文件(F)");

m3=new Menu("编辑(E)");

m4=new Menu("格式(O)");

m5=new Menu("查看(V)");

m6=new Menu("帮助(H)");

m2=new Menu("一级");

mi11=new MenuItem("新建(N)",new MenuShortcut(KeyEvent.VK_N));

mi12=new MenuItem("打开(O)",new MenuShortcut(KeyEvent.VK_O));

mi14=new MenuItem("保存(S)",new MenuShortcut(KeyEvent.VK_S));

mi15=new MenuItem("另存为");

mi13=new MenuItem("退出(X)",new MenuShortcut(KeyEvent.VK_X));

mi21=new MenuItem("子菜单1");

mi22=new MenuItem("子菜单2");

mi41=new MenuItem("字体");

mi42=new MenuItem("背景");

fd=new FileDialog(this,"打开(O)",FileDialog.LOAD);

fd1=new FileDialog(this,"保存(S)",FileDialog.SAVE);

mi12.addActionListener(this);

mi14.addActionListener(this);

mi15.addActionListener(this);

ta=new TextArea();

add(ta,BorderLayout.CENTER);

setMenuBar(mb);

mb.add(m1);

mb.add(m3);

mb.add(m4);

mb.add(m5);

mb.add(m6);

m1.add(mi11);

m1.add(mi12);

m1.add(mi14);

m1.add(mi15);

m1.add(m2);

m1.addSeparator();

m1.add(mi13);

m2.add(mi21);

m2.add(mi22);

m4.add(mi41);

m4.add(mi42);

mi13.addActionListener(this);

this.addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

setBounds(200,200,400,300);

setVisible(true);

public static void main(String[] args) {

new TextMenu();

public void actionPerformed(ActionEvent e) {

String str=e.getActionCommand();

if(str.equals("退出(X)")){

}else if(str.equals("打开(O)")){

fd.setVisible(true);

String d=fd.getDirectory();

String f=fd.getFile();

if(d!=null&&f!=null){

file=d+f;

loadFile();

}else if(str.equals("保存(S)")){

if(file==null||file.equals("")){

saveFileAs();

}else{

saveFile();

}else if(str.equals("另存为")){

public void loadFile(){

ta.setText("");

this.setTitle("记事本--"+file);

try{

BufferedReader br=new BufferedReader(new FileReader(file));

String s=br.readLine();

while(s!=null){

ta.append(s+"\n");

s=br.readLine();

br.close();

}catch(IOException e){

e.printStackTrace();

public void saveFile(){

String content=ta.getText();

PrintWriter pw=new PrintWriter(new FileWriter(file));

pw.println(content);

pw.close();

public void saveFileAs(){

fd1.setVisible(true);

String d=fd1.getDirectory();

String f=fd1.getFile();

if((d!=null)&&(f!=null)){

setTitle("记事本--"+file);