用AWT實現的，有些功能還沒有實現。
/**
?* AWT的記事本應用程序
?* @author Rabbit
?*/
package com.sinojava.two;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class MenuOne {
?//記事本的組件變量聲明
?private Frame f;
?private MenuBar mb;
?private Menu m1,m2,m3;
?private MenuItem mi1,mi2,mi3,mi4,mi5;
?private CheckboxMenuItem cmi;
?private TextArea ta;
?private FileDialog fd1,fd2;
?private Dialog d;
?private Button b1,b2,b3;
?private String str1,str2,line,result="";
?//MenuOne的構造器，構造記事本
?public MenuOne() {
??//窗體的定義
??f = new Frame("MyMenu");
??fd1 = new FileDialog(f,"Open",FileDialog.LOAD);
??fd2 = new FileDialog(f,"Save",FileDialog.SAVE);
??ta = new TextArea();
??//對話框的實現
??d = new Dialog(f,"是否保存文件？");
??d.setLocation(300, 300);
??b1 = new Button("Yes");
??b2 = new Button("Cancel");
??b3 = new Button("No");
??d.setLayout(new FlowLayout());
??d.add(b1);
??d.add(b3);
??d.add(b2);
??d.setSize(100,100);
??d.pack();
??//菜單的創建和添加
??f.add(ta,BorderLayout.CENTER);
??mb = new MenuBar();
??m1 = new Menu("File");
??m2 = new Menu("Edit");
??m3 = new Menu("Help");
??mb.add(m1);
??mb.add(m2);
??mb.setHelpMenu(m3);
??//子菜單的創建
??f.setMenuBar(mb);
??mi1 = new MenuItem("New");
??mi2 = new MenuItem("Open");
??mi4 = new MenuItem("Save");
??mi5 = new MenuItem("Print");
??mi3 = new MenuItem("Exit");
??cmi = new CheckboxMenuItem("Select");
??//向File內加入子菜單
??m1.add(mi1);
??m1.add(mi2);
??m1.add(mi4);
??m1.addSeparator();
??m1.add(mi5);
??m1.addSeparator();
??m1.add(mi3);
??m1.addSeparator();
??m1.add(cmi);
??
??//退出整個記事本
??f.addWindowListener(new WindowAdapter() {
???public void windowClosing(WindowEvent e) {
????System.exit(0);
???}
??});
??//新建Yes的狀態
??b1.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????fd2.show();
????str2 = fd2.getDirectory()+fd2.getFile();
????String a = ta.getText();
????writeFile(str2,a);
????d.setVisible(false);
????ta.setText(null);
???}
??});
??b3.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????d.setVisible(false);
????ta.setText(null);
???}
??});
??//新建Cancel的狀態
??b2.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????d.setVisible(false);
???}
??});
??//新建一個文本
??mi1.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????String b = ta.getText();
????System.out.println(b);
????if(b.equals(""))
????{
????????????? d.setVisible(false);
????}
????else
????{
???????????????? d.setVisible(true);
????}?
???}
??});
??//打開一個文本
??mi2.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????fd1.show();
????str1 = fd1.getDirectory()+fd1.getFile();
????ta.setText(readFile(str1));
???}
??});
??//保存一個文本
??mi4.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????fd2.show();
????
????str2 = fd2.getDirectory()+fd2.getFile();
????String a = ta.getText();
????writeFile(str2,a);
???}
??});
??//點擊退出
??mi3.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????System.exit(1);
???}
??});
??//選擇性條目
??cmi.addItemListener(new ItemListener() {
???public void itemStateChanged(ItemEvent e) {
????if(e.getStateChange()==ItemEvent.SELECTED) {
?????ta.setText("Select");
????}
????if(e.getStateChange()==ItemEvent.DESELECTED) {
?????ta.setText(null);
????}
???}
??});
??//實現打印在后臺上
??mi5.addActionListener(new ActionListener() {
???public void actionPerformed(ActionEvent e) {
????String c = ta.getText();
????System.out.println(c);
???}
??});
??f.setSize(500,500);
??f.setVisible(true);
?}
?//讀取一個文件
? public String readFile(String s)
??? {
??? ? try
??? ???? {
??? ???? ??? FileReader fr = new FileReader(str1);
??? ???? ??? BufferedReader br = new BufferedReader(fr);
??? ???? ??? while((line=br.readLine())!=null)
??? ???? ??? {
??? ???? ??? ?? result+=line+"\n";
??? ???? ??? }
??? ???? ???
??? ???? ??? fr.close();
??? ???? ??? br.close();
??? ???? }catch(IOException e)
??? ???? {
??? ???? ??? System.out.println("Error:"+e.getMessage());
??? ???? }
??? ???? return result;
??? ?}?
? //寫入一個文件
? public void writeFile(String s,String ss) {
?? try {
???//BufferedWriter bw = new (fw);
??? PrintWriter out
????? = new PrintWriter(new FileWriter(s),true);???
??? out.println(ss+"\n");
??? out.flush();
??? out.close();?
?? }
?? catch(IOException e) {
??? System.out.println("Error:"+e.getMessage());
?? }
? }
}
public class MyMenu {
?public static void main(String[] args) {
??//創建構造函數MenuOne來運行
??MenuOne mo = new MenuOne();
?}
}