mymemo1.java

里面写的是 一些J2SE 的日历和 计算机的代码 还有时间钟表的代码 供初学者参考

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class MyMemo1 extends JFrame implements ActionListener{
	 TextArea ta = new TextArea();
	 MyMenuBar mb = new MyMenuBar(this);
	 MyFile mf = new MyFile(this);
	 
	public MyMemo1(String title){
		super(title);
		this.setMenuBar(mb);
		this.add(ta);
		this.setBounds(400,200,300,300);
		this.setVisible(true);
	}
	
	public void actionPerformed(ActionEvent e){
		if(e.getActionCommand()=="新建"){
			ta.setText("");
			
		}
		else if(e.getActionCommand()=="打开"){
			String s = mf.getData();
			ta.setText(s);
		}
		else if(e.getActionCommand()=="保存"){
			String s = ta.getText();
			mf.saveData(s);
		}
		else if(e.getActionCommand()=="退出"){
			this.dispose();
		}
	}
	
	public static void main(String[] args){
		new MyMemo1("记事本");
	}
}

class MyMenuBar extends MenuBar {
	String[] menus = {"文件","编辑","查找","帮助"};
	String[][] menuItems = {{"新建","打开","保存",null,"退出"},
	                     {"剪贴","复制","粘贴","清除",null,"全选"},
	                     {"查找",null,"查找替换"},
	                     {"信息"}}; 
	  
	  //MyMemo1 jf;             
	public MyMenuBar(MyMemo1 jf){
		//this.jf = jf;
		for(int i=0;i<menus.length ;i++){
			this.add(new Menu(menus[i]));
		}
		for(int i=0;i<this.getMenuCount();i++){
			for(int j=0;j<menuItems[i].length;j++){
				if(menuItems[i][j]==null){
					this.getMenu(i).addSeparator();
				}
				else{
				    this.getMenu(i).add(new MenuItem(menuItems[i][j]));
				    this.getMenu(i).getItem(j).addActionListener(jf);
				}
			}
		}
		
		
	}
	

}

class MyFile extends FileDialog{
	public MyFile(MyMemo1 parent){
		super(parent);
	}
	
	public String getPath(){
		return this.getDirectory()+"\\"+this.getFile();
	}
	//打开 获取所选文件的内容，以String 返回
	public String getData(){
		String aline;
		StringBuffer sb = new StringBuffer();
		this.setTitle("打开");
		this.setMode(FileDialog.LOAD);
		this.setVisible(true);
		try{
			BufferedReader br = new BufferedReader(
			               new FileReader(this.getPath()));
			while( (aline = br.readLine()) !=null){
				sb.append(aline+"\n");
			}
			br.close();
		}catch(IOException e){
			e.printStackTrace();
		}
		
		return sb.toString();
	}
	
	//保存 将ta的内容保存到选定的文件中
	public void saveData(String s){
		
		this.setTitle("保存");
		this.setMode(FileDialog.SAVE);
		this.setVisible(true);
		try{
			BufferedWriter bw = new BufferedWriter(
			               new FileWriter(this.getPath()));
			
			bw.write(s);
			bw.close();
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}