Java实现记事本

import java.awt.Color;import java.awt.FileDialog;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.DataOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class MyFrame{public static void main(String []args){final Frame f=new Frame("zhycheng");f.setSize(300, 400);f.setLocation(400, 300);f.setBackground(Color.CYAN);//TextField tf=new TextField(20);//f.add(tf,"North");final TextArea ta=new TextArea();f.add(ta);f.setVisible(true);f.addWindowListener(new WindowAdapter(){@Overridepublic void windowClosing(WindowEvent e) {// TODO Auto-generated method stubsuper.windowClosing(e);System.exit(0);}});MenuBar mb=new MenuBar();Menu m1=new Menu("File");Menu m2=new Menu("Edit");//MenuItem mi1=new MenuItem("New");MenuItem mi2=new MenuItem("Open");mi2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubFileDialog fd=new FileDialog(f,"zhycheng",FileDialog.LOAD);fd.show();String strFile=fd.getDirectory()+fd.getFile();FileInputStream fis=null;if(strFile!=null){try {fis=new FileInputStream(strFile);byte []buf=new byte[10*1024];int len=fis.read(buf);ta.append(new String(buf,0,len));} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}finally{try {fis.close();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}}});MenuItem mi3=new MenuItem("Save");mi3.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubFileDialog fd=new FileDialog(f,"zhycheng",FileDialog.SAVE);fd.show();String path=fd.getDirectory()+fd.getFile()+".txt";FileOutputStream fos=null;DataOutputStream dos=null;try {fos=new FileOutputStream(path);String sa=ta.getText();dos=new DataOutputStream(fos);dos.writeUTF(sa);} catch (Exception e1) {e1.printStackTrace();}finally{try {dos.close();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}}});MenuItem mi4=new MenuItem("Exit");mi4.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stubSystem.exit(0);}});MenuItem mi5=new MenuItem("Copy");MenuItem mi6=new MenuItem("Paste");//m1.add(mi1);m1.add(mi2);m1.add(mi3);m1.add(mi4);m2.add(mi5);m2.add(mi6);mb.add(m1);mb.add(m2);f.setMenuBar(mb);}}

这段代码只是实现了记事本的简单功能，主要有打开文件，保存文件，退出功能。没有必要实现全部功能，因为做PC上的应用软件不是Java的强项。