swingapplication.java

我在学习JAVA的讲义

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

public class SwingApplication
	{
	private static String labelPrefix = "当前界面观感:";
	private int           numClicks = -1;
		JPanel pane ;
	public Component createComponents()
		{
		final JLabel label = new JLabel(labelPrefix + UIManager.getLookAndFeel().toString());
		JButton      button = new JButton("I'm a Swing button!");
		button.setMnemonic(KeyEvent.VK_I);
		 pane = new JPanel();
		pane.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30));
		pane.setLayout(new GridLayout(0, 1));
		button.addActionListener(new ActionListener()
			{
			public void actionPerformed(ActionEvent e)
			{
				numClicks=(numClicks+1)%3;
				try
				{
					switch (numClicks){
					case 0:
						UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
						//UIManager.setLookAndFeel("com.sun.java.swing.plaf.metal.MetalLookAndFeel");
						break;
					case 1:
						UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
						break;
					case 2:
						UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
						break;
					}
				}catch (Exception t){}
				SwingUtilities.updateComponentTreeUI(pane);
				label.setText(labelPrefix + UIManager.getLookAndFeel().toString());
			}
			});
		pane.add(button);
		pane.add(label);
		return pane;
		}

	public static void main(String args [])
		{
		try
			{
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			}
		catch (Exception e)
			{
			}

		JFrame           frame = new JFrame("SwingApplication");
		SwingApplication app = new SwingApplication();
		Component        contents = app.createComponents();
		frame.getContentPane().add(contents, BorderLayout.CENTER);
		frame.addWindowListener(new WindowAdapter()
			{
			public void windowClosing(WindowEvent e)
				{
				System.exit(0);
				}
			});

		frame.pack();
		frame.setVisible(true);
		}
	}