Java实现简单记事本

新建Java源代码格式文件，直接上代码：

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
 
//简单的文本编辑器
 
public class Editor extends JFrame {
    public JTextPane textPane = new JTextPane(); //文本窗格d，编辑窗口
    public JFileChooser filechooser = new JFileChooser(); //文件选择器
 
    public Editor()
    {
        super("记事本");
        
        Action[] actions=            //菜单项的各种功能
            {
                    new NewAction(),
                    new OpenAction(),
                    new SaveAction(),
                    new CutAction(),
                    new CopyAction(),
                    new PasteAction(),
                    new AboutAction(),
                    new ExitAction(),
                    new HelpAction()
            };
        setJMenuBar(createJMenuBar(actions));        //根据actions创建菜单栏
        Container container=getContentPane();        
        container.add(textPane, BorderLayout.CENTER);
        
        setSize(800, 600);
        setVisible(true);
    //    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
 
    private JMenuBar createJMenuBar(Action[] actions)    //创建菜单栏的函数
    {
        JMenuBar menubar=new JMenuBar();
        JMenu menuFile=new JMenu("文件(F)");
        JMenu menuEdit=new JMenu("编辑(E)");
        JMenu menuAbout=new JMenu("帮助(H)");
        menuFile.add(new JMenuItem(actions[0]));
        menuFile.add(new JMenuItem(actions[1]));
        menuFile.add(new JMenuItem(actions[2]));
        menuFile.add(new JMenuItem(actions[7]));
        menuEdit.add(new JMenuItem(actions[3]));
        menuEdit.add(new JMenuItem(actions[4]));
        menuEdit.add(new JMenuItem(actions[5]));
        menuAbout.add(new JMenuItem(actions[6]));
        menuAbout.add(new JMenuItem(actions[8]));
        menubar.add(menuFile);
        menubar.add(menuEdit);
        menubar.add(menuAbout);
        return menubar;
    }
 
    class NewAction extends AbstractAction        //新建
    {
        public NewAction()
        {
            super("新建(N)     Ctrl+N");
        }
        public void actionPerformed(ActionEvent e)
        {
            textPane.setDocument(new DefaultStyledDocument());
        }
    }
 
    class OpenAction extends AbstractAction        //打开
    {
        public OpenAction()
        {
            super("打开(O)     Ctrl+O");
        }
        public void actionPerformed(ActionEvent e)
        {
            int i=filechooser.showOpenDialog(Editor.this);            //显示打开文件对话框
            if(i==JFileChooser.APPROVE_OPTION)            //点击对话框打开选项
            {
                File f=filechooser.getSelectedFile();    //得到选择的文件
                try
                {
                    InputStream is=new FileInputStream(f);
                    textPane.read(is, "d");
                }
                catch(Exception ex)
                {
                    ex.printStackTrace();
                }
            }
        }
    }
 
    class SaveAction extends AbstractAction        //保存
    {
        public SaveAction()
        {
            super("保存(S)     Ctrl+S");
        }
        public void actionPerformed(ActionEvent e)
        {
            int i=filechooser.showSaveDialog(Editor.this);
            if(i==JFileChooser.APPROVE_OPTION)
            {
                File f=filechooser.getSelectedFile();
                try
                {
                    FileOutputStream out=new FileOutputStream(f);
                    out.write(textPane.getText().getBytes());
                }
                catch(Exception ex)
                {
                    ex.printStackTrace();
                }
            }
        }
    }
 
    class ExitAction extends AbstractAction        //退出
    {
        public ExitAction()
        {
            super("退出(X)");
        }
        public void actionPerformed(ActionEvent e)
        {
            dispose();
        }
    }
 
    class CutAction extends AbstractAction        //剪切
    {
        public CutAction()
        {
            super("剪切(T)     Ctrl+X");
        }
        public void actionPerformed(ActionEvent e)
        {
            textPane.cut();
        }
    }
    
    class CopyAction extends AbstractAction        //复制
    {
        public CopyAction()
        {
            super("复制(C)     Ctrl+C");
        }
        public void actionPerformed(ActionEvent e)
        {
            textPane.copy();
        }
    }
 
    class PasteAction extends AbstractAction        //粘贴
    {
        public PasteAction()
        {
            super("粘贴(P)     Ctrl+V");
        }
        public void actionPerformed(ActionEvent e)
        {
            textPane.paste();
        }
    }
 
    class AboutAction extends AbstractAction
    {
        public AboutAction()
        {
            super("关于记事本(A)");
        }
        public void actionPerformed(ActionEvent e)
        {
            JOptionPane.showMessageDialog(Editor.this,"实现了记事本的一些基本功能","关于",JOptionPane.PLAIN_MESSAGE);
        }
    }
    
    class HelpAction extends AbstractAction
    {
        public HelpAction()
        {
            super("联系开发者");
        }
        public void actionPerformed(ActionEvent e)
        {
            JOptionPane.showMessageDialog(Editor.this,"meteor_disappears@foxmail.com","开发者:王子辰",JOptionPane.PLAIN_MESSAGE);
        }
    }
    
    public static void main(String[] args)
    {
        new Editor();
    }
}

保存完后 javac --> java 即可直接使用。