notepad.java

这个程序是模仿记事本的一个小小记事本

import java.awt.Event;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;

public class Notepad extends JFrame {

	/**
	 *
	 */
	public Notepad() {

		super("NotePad");

		final JTextArea text = new JTextArea();
		final JPanel panel = new JPanel();
		panel.setLayout(new GridLayout(1, 1));
		panel.add(new JScrollPane(text));
		getContentPane().add(panel);

		/**
		 * create fileMenu
		 */
		JMenu fileMenu = new JMenu("File");
		fileMenu.setMnemonic('F');

		// create the newitem
		JMenuItem newitem = new JMenuItem("New");
		newitem.setMnemonic('N');
		newitem.setAccelerator(KeyStroke.getKeyStroke('N',
				java.awt.Event.CTRL_MASK, true));
		fileMenu.add(newitem);
		newitem.addActionListener(

		new ActionListener() {

			public void actionPerformed(ActionEvent event) {

				text.setText(" ");

			}

		}

		);

		// create openitem
		JMenuItem openitem = new JMenuItem("Open...");
		openitem.setMnemonic('O');
		openitem.setAccelerator(KeyStroke.getKeyStroke('O',
				java.awt.Event.CTRL_MASK, true));
		fileMenu.add(openitem);// no listener

		// create saveitem
		JMenuItem saveitem = new JMenuItem("Save");
		saveitem.setMnemonic('S');
		saveitem.setAccelerator(KeyStroke.getKeyStroke('S',
				java.awt.Event.CTRL_MASK, true));
		fileMenu.add(saveitem);// no listener

		// create separator
		fileMenu.addSeparator();

		// create exititem
		JMenuItem exititem = new JMenuItem("Exit");
		exititem.setMnemonic('x');
		fileMenu.add(exititem);
		exititem.addActionListener(

		new ActionListener() {

			public void actionPerformed(ActionEvent event) {
				System.exit(0);
			}

		}

		);

		/**
		 * create editMenu
		 */
		JMenu editMenu = new JMenu("Edit");
		editMenu.setMnemonic('E');

		// create cut
		JMenuItem cutItem = new JMenuItem("Cut");
		cutItem.setMnemonic('C');
		cutItem.setAccelerator(KeyStroke.getKeyStroke('X',
				java.awt.Event.CTRL_MASK, true));
		editMenu.add(cutItem);
		cutItem.addActionListener(

		new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				text.cut();

			}

		});

		// create paste
		JMenuItem pasteItem = new JMenuItem("Paste");
		pasteItem.setMnemonic('P');
		pasteItem.setAccelerator(KeyStroke.getKeyStroke('V',
				java.awt.Event.CTRL_MASK, true));
		editMenu.add(pasteItem);
		pasteItem.addActionListener(

		new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				text.paste();

			}

		});

		// create copy
		JMenuItem copyItem = new JMenuItem("Copy");
		copyItem.setMnemonic('o');
		copyItem.setAccelerator(KeyStroke.getKeyStroke('C',
				java.awt.Event.CTRL_MASK, true));
		editMenu.add(copyItem);
		pasteItem.addActionListener(

		new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				text.copy();

			}

		});

		/**
		 * create help
		 */
		JMenu helpMenu = new JMenu("Help");
		helpMenu.setMnemonic('H');

		// create aboutItem
		JMenuItem aboutItem = new JMenuItem("About");
		aboutItem.setMnemonic('A');
		aboutItem.setAccelerator(KeyStroke.getKeyStroke('A', Event.CTRL_MASK,
				true));
		helpMenu.add(aboutItem);
		aboutItem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {

				JOptionPane.showMessageDialog(Notepad.this, "Made by ZhengYan",
						"About", JOptionPane.PLAIN_MESSAGE);

			}

		});

		JMenuBar bar = new JMenuBar();
		setJMenuBar(bar);
		bar.add(fileMenu);
		bar.add(editMenu);
		bar.add(helpMenu);

		setSize(600, 400);
		setVisible(true);
	}

	public static void main(String[] args) {

		Notepad application = new Notepad();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}