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   源码介绍

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实现windows自带记事本中绝大部分功能

import java.awt.MenuItem;
import java.awt.event.KeyEvent;

import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.basic.BasicLookAndFeel;
import javax.swing.plaf.metal.MetalLookAndFeel;
import javax.swing.plaf.multi.MultiLookAndFeel;
import javax.swing.plaf.synth.SynthLookAndFeel;

public class MainFrame extends JFrame {

	public MyTextArea textArea;
	private JMenuBar menuBar1;
	private JMenu menuA, menuB, menuC;  //文件菜单，编辑菜单，格式菜单
    
	//文件菜单各选项名称
	private String itemA[] = { "新建（N）", "打开（O）", "保存（S）", "另存为（A）", "退出（X）" };
	private char itemAk[] = { 'N', 'O', 'S', 'A', 'X' };   //各选项对应的快捷键
	public JMenuItem menuItemA[] = new JMenuItem[itemA.length];

	//编辑菜单各选项名称
	private String itemB[] = { "撤销（U）", "恢复（R）", "剪贴（T）", "复制（C）", "粘贴（P）",
			"删除（L）", "全选（A）", "时间/日期（D）" };
	private char itemBk[] = { 'U', 'R', 'T', 'C', 'P', 'L', 'A', 'D' };
	public JMenuItem menuItemB[] = new JMenuItem[itemB.length];

	//格式菜单各选项名称
	private String itemC[] = { "自动换行（W）", "字体（F）","颜色（C）" };
	private char itemCk[] = { 'W', 'F','C' };
	public JMenuItem menuItemC[] = new JMenuItem[itemC.length];

	//构造函数
	public MainFrame() {
		addComponent();
		this.setTitle("无标题 -记事本");
		this.setSize(900, 600);
		this.setDefaultCloseOperation(3);
		this.setLocationRelativeTo(null);
		this.setVisible(true);
	}

	//添加组件
	public void addComponent() {
		textArea = new MyTextArea(this);
		this.getContentPane().add(new JScrollPane(textArea));

		menuBar1 = new JMenuBar();
		this.setJMenuBar(menuBar1);

		// 菜单一（文件）
		menuA = new JMenu("文件（F）");
		menuA.setMnemonic('F'); // 设置快捷键
		for (int i = 0; i < menuItemA.length; i  ) {   //实例化各菜单项
			menuItemA[i] = new JMenuItem(itemA[i], itemAk[i]);
			menuItemA[i].setMnemonic(itemAk[i]);
			menuA.add(menuItemA[i]); // 给菜单一添加选项
			if (i == 3)
				menuA.addSeparator();
		}
		menuBar1.add(menuA);

		// 菜单二（编辑）
		menuB = new JMenu("编辑（E）");
		menuB.setMnemonic('E');
		for (int i = 0; i < menuItemB.length; i  ) { //实例化各菜单项
			menuItemB[i] = new JMenuItem(itemB[i]);
			menuItemB[i].setMnemonic(itemBk[i]);
			menuB.add(menuItemB[i]); // 添加菜单二选项
			if (i == 1 || i == 4)
				menuB.addSeparator();
		}
		menuBar1.add(menuB);

		// 菜单三（格式）
		menuC = new JMenu("格式（O）");
		menuC.setMnemonic('O');
		for (int i = 0; i < menuItemC.length; i  ) { //实例化各菜单项
			if (i == 0) { // 自动换行设为checkBox菜单项
				menuItemC[i] = new JCheckBoxMenuItem(itemC[i]);
				menuItemC[i].setMnemonic(itemCk[i]);
				menuC.add(menuItemC[i]);
			} else {
				menuItemC[i] = new JMenuItem(itemC[i]);
				menuItemC[i].setMnemonic(itemCk[i]);
				menuC.add(menuItemC[i]);
			}
		}
		menuBar1.add(menuC);
		
		//为菜单选项添加加速器
		menuItemA[0].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,KeyEvent.CTRL_MASK));
		menuItemA[1].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,KeyEvent.CTRL_MASK));
		menuItemA[2].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,KeyEvent.CTRL_MASK));
		
		menuItemB[0].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z,KeyEvent.CTRL_MASK));
		menuItemB[1].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Y,KeyEvent.CTRL_MASK));
		menuItemB[2].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,KeyEvent.CTRL_MASK));
		menuItemB[3].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,KeyEvent.CTRL_MASK));
		menuItemB[4].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,KeyEvent.CTRL_MASK));
		menuItemB[5].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE,0));
		// 为菜单项添加监听器
		FileItemListener menuItemListener = new FileItemListener(this);
		for (int i = 0; i < menuItemA.length; i  ) {
			menuItemA[i].addActionListener(menuItemListener); 
		}

		for (int i = 0; i < menuItemB.length; i  ) {
			menuItemB[i].addActionListener(textArea);
		}
		menuB.addMenuListener(textArea);

		for (int i = 0; i < menuItemC.length; i  ) {
			menuItemC[i].addActionListener(textArea);
		}
	}

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

	}

}