test.java

来自「《Java2图形设计卷II：Swing》配套光盘源码」· Java 代码 · 共 59 行

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class Test extends JApplet {
	public void init() {
		JMenuBar mb = new JMenuBar();
		JMenu fileMenu = new JMenu("File");
		JMenuItem newItem = new JMenuItem("New ..."),
					openItem = new JMenuItem("Open ..."),
					saveItem = new JMenuItem("Save"),
					saveAsItem = new JMenuItem("Save As ..."),
					exitItem = new JMenuItem("Exit");
		Listener listener = new Listener(this);

		fileMenu.add(newItem);
		fileMenu.add(openItem);
		fileMenu.add(saveItem);
		fileMenu.add(saveAsItem);
		fileMenu.addSeparator();
		fileMenu.add(exitItem);

		newItem.setActionCommand("Create a New Document");
		openItem.setActionCommand("Open an Existing Document");
		saveItem.setActionCommand("Save Document");
		saveAsItem.setActionCommand("Save Document As ...");
		exitItem.setActionCommand("Exit the applet");

		newItem.addChangeListener(listener);
		openItem.addChangeListener(listener);
		saveItem.addChangeListener(listener);
		saveAsItem.addChangeListener(listener);
		exitItem.addChangeListener(listener);

		mb.add(fileMenu);
		setJMenuBar(mb);

		exitItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
	}
}
class Listener implements ChangeListener {
	private JApplet applet;

	public Listener(JApplet applet) {
		this.applet = applet;
	}
	public void stateChanged(ChangeEvent e) {
		JMenuItem b = (JMenuItem)e.getSource();

		if(b.isArmed())
			applet.showStatus(b.getActionCommand());
	}
}