我的记事本（简单功能实现）

[java]代码库

package NoteBook;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.text.SimpleDateFormat;
import javax.swing.*;

public class SampleNoteBook extends JFrame implements ActionListener, Runnable {
	private JMenuBar mb;
	private JMenu file, edit, form, help, timeShow, size, color;
	private JMenuItem newFile, open, save, save1, exit;
	private JMenuItem copy, paste, cut, time;
	private JMenuItem about;
	private JMenuItem size1, size2, size3, size4;
	private JMenuItem color1, color2, color3;
	private FileDialog openDialog, saveDialog, save1Dialog;
	private TextArea ta;
	private File file1;

	public void setupTime() {

		Thread thread1 = new Thread(this);

		thread1.start();
	}

	public void run() {
		while (true) {
			SimpleDateFormat sdf = new SimpleDateFormat("HH : mm : ss");
			timeShow.setText("当前时间:  " + sdf.format(new Date()));
			timeShow.setForeground(Color.RED);
		}
	}

	public SampleNoteBook() {
		Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
		int width = d.width;
		int height = d.height;
		this.setLocation((width - 700) / 2, (height - 500) / 2);
		this.setSize(700, 500);
		this.setTitle("简易记事本");
		this.setResizable(false);
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);

		// 将Frame标题栏的图标修改成你自己的图标了
		Toolkit tk = Toolkit.getDefaultToolkit();
		Image image = tk
				.createImage("D:\\Eclipse\\workspace\\NoteBook\\images\\36.gif"); /*
																				 * image
																				 * .
																				 * gif是你的图标
																				 */
		this.setIconImage(image);

		mb = new JMenuBar();
		file = new JMenu("文件");
		edit = new JMenu("编辑");
		form = new JMenu("格式");
		help = new JMenu("帮助");
		timeShow = new JMenu();
		size = new JMenu("字体大小");
		color = new JMenu("字体颜色");
		newFile = new JMenuItem("新建");
		open = new JMenuItem("打开");
		save = new JMenuItem("保存");
		save1 = new JMenuItem("另存为");
		exit = new JMenuItem("退出");
		copy = new JMenuItem("复制");
		paste = new JMenuItem("粘贴");
		cut = new JMenuItem("剪切");
		time = new JMenuItem("当前时间");
		ta = new TextArea();
		ta.setEditable(false);

		about = new JMenuItem("关于");

		size1 = new JMenuItem("10");
		size2 = new JMenuItem("15");
		size3 = new JMenuItem("20");
		size4 = new JMenuItem("25");
		color1 = new JMenuItem("红色");
		color2 = new JMenuItem("绿色");
		color3 = new JMenuItem("蓝色");
		color1.setForeground(Color.RED);
		color2.setForeground(Color.GREEN);
		color3.setForeground(Color.BLUE);
		/*
		 * size1.setFont(new Font("宋体",Font.BOLD,10)); size2.setFont(new
		 * Font("宋体",Font.BOLD,15)); size3.setFont(new Font("宋体",Font.BOLD,20));
		 * size4.setFont(new Font("宋体",Font.BOLD,25));
		 */

		openDialog = new FileDialog(this, "打开", FileDialog.LOAD);
		saveDialog = new FileDialog(this, "保存", FileDialog.SAVE);
		save1Dialog = new FileDialog(this, "另存为", FileDialog.SAVE);

		mb.add(file);
		file.add(newFile);
		file.add(open);
		file.addSeparator();
		file.add(save);
		file.add(save1);
		file.addSeparator();
		file.add(exit);

		mb.add(edit);
		edit.add(copy);
		edit.add(paste);
		edit.add(cut);
		edit.addSeparator();
		edit.add(time);

		mb.add(form);
		form.add(size);
		form.add(color);

		size.add(size1);
		size.add(size2);
		size.add(size3);
		size.add(size4);
		color.add(color1);
		color.add(color2);
		color.add(color3);

		mb.add(help);
		help.add(about);

		mb.add(timeShow);

		this.add(ta);
		this.setJMenuBar(mb);

		this.setVisible(true);
		setupTime(); // 开启时间多线程

		exit.addActionListener(this);
		about.addActionListener(this);
		open.addActionListener(this);
		save.addActionListener(this);
		save1.addActionListener(this);
		color1.addActionListener(this);
		color2.addActionListener(this);
		color3.addActionListener(this);

		// size1.addActionListener(this);
		// size2.addActionListener(this);
		// size3.addActionListener(this);
		// size4.addActionListener(this);
		newFile.addActionListener(this);
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == exit) {

			int num = JOptionPane.showConfirmDialog(null, "       你确定要退出？",
					"退出", JOptionPane.YES_NO_CANCEL_OPTION);
			if (num == JOptionPane.YES_OPTION)
				System.exit(0);
		}

		else if (e.getSource() == newFile) {
			ta.setEditable(true);
		}

		else if (e.getSource() == size1)
			ta.setFont(new Font("宋体", Font.BOLD, 10));

		else if (e.getSource() == size2)
			ta.setFont(new Font("宋体", Font.BOLD, 15));

		else if (e.getSource() == size3)
			ta.setFont(new Font("宋体", Font.BOLD, 20));

		else if (e.getSource() == size4)
			ta.setFont(new Font("宋体", Font.BOLD, 25));

		else if (e.getSource() == color1)
			ta.setForeground(Color.RED);

		else if (e.getSource() == color2)
			ta.setForeground(Color.GREEN);

		else if (e.getSource() == color3)
			ta.setForeground(Color.BLUE);

		else if (e.getSource() == about)
			JOptionPane.showMessageDialog(null, "     --汉代风云-作品\n  版权所有，侵权必究",
					"版权信息", JOptionPane.INFORMATION_MESSAGE);

		else if (e.getSource() == open) {
			openDialog.setVisible(true);
			String dirPath = openDialog.getDirectory();
			String fileName = openDialog.getFile();
			if (dirPath == null || fileName == null)
				return;
			ta.setText("");
			file1 = new File(dirPath, fileName);

			try {
				BufferedReader bufr = new BufferedReader(new FileReader(file1));
				String line = null;
				while ((line = bufr.readLine()) != null) {
					ta.append(line + "\r\n");
				}
				bufr.close();
			} catch (FileNotFoundException e1) {

				e1.printStackTrace();
			} catch (IOException e1) {

				e1.printStackTrace();
			}

		}

		else if (e.getSource() == save1) {

			save1Dialog.setVisible(true);

			String dirPath = save1Dialog.getDirectory();
			String fileName = save1Dialog.getFile();
			if (dirPath == null || fileName == null)
				return;
			file1 = new File(dirPath, fileName);

			try {
				BufferedWriter bufw = new BufferedWriter(new FileWriter(file1));
				String text = ta.getText();
				bufw.write(text);
				bufw.close();

			} catch (IOException e1) {

				e1.printStackTrace();
			}

		}

		else if (e.getSource() == save) {

			if (file1 == null) {
				saveDialog.setVisible(true);

				String dirPath = saveDialog.getDirectory();
				String fileName = saveDialog.getFile();
				if (dirPath == null || fileName == null)
					return;
				file1 = new File(dirPath, fileName);
			}

			try {
				BufferedWriter bufw = new BufferedWriter(new FileWriter(file1));
				String text = ta.getText();
				bufw.write(text);
				bufw.close();

			} catch (IOException e1) {

				e1.printStackTrace();
			}

		}
	}

	public static void main(String[] args) {
		new SampleNoteBook();
	}

}

[代码运行效果截图]

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