JButton演示操作

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

/**
 * Title:JButton操作
 * Description:演示按钮的事件响应和按钮的实效
 * @author fan
 *
 */
public class MyButtonDemo extends JFrame implements ActionListener{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * 定义三个按钮
	 */
	private JButton b1, b2, b3;
	/**
	 * 定义ImageIcon对象用于图标对象
	 */
	private ImageIcon rightImage, middleImage, leftImage;
	
	/**
	 * 定义一个面板
	 */
	private JPanel contentPane =new JPanel();
	/**
	 * 方法说明：构造方法
	 */
	public MyButtonDemo(){
		leftImage = createImageIcon("base2011/images/left.gif");
		middleImage = createImageIcon("base2011/images/middle.gif");
		rightImage = createImageIcon("base2011/images/right.gif");
		//构建窗体
		this.lunchFrame("ButtonDemo");
	}
	/**
	 * 构建窗体
	 */
	private void lunchFrame(String title){
		b1 = new JButton("失效中间按钮", leftImage);
		b1.setVerticalTextPosition(AbstractButton.CENTER);
		b1.setHorizontalTextPosition(AbstractButton.LEADING);
		b1.setMnemonic(KeyEvent.VK_D);
		b1.setActionCommand("Disable");
		b1.setToolTipText("点击此按钮时中间按钮失效");
		b1.addActionListener(this);
		
		b2 = new JButton("中间按钮", middleImage);
		b2.setVerticalTextPosition(AbstractButton.BOTTOM);
		b2.setHorizontalTextPosition(AbstractButton.LEADING);
		b2.setMnemonic(KeyEvent.VK_M);
		b2.setToolTipText("点击此按钮无任何事件发生");
		
		b3 = new JButton("激活中间按钮", rightImage);
		b3.setHorizontalTextPosition(AbstractButton.LEADING);
		b3.setVerticalTextPosition(AbstractButton.CENTER);
		b3.setMnemonic(KeyEvent.VK_E);
		b3.setToolTipText("点击此按钮使中间按钮激活");
		b3.setActionCommand("Enable");
		b3.setEnabled(false);
		b3.addActionListener(this);
		
		contentPane.add(b1);
		contentPane.add(b2);
		contentPane.add(b3);
		contentPane.setOpaque(false);//绘制边界内所有元素
		this.setContentPane(contentPane);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
		this.setTitle(title);
		this.pack();
		//将窗体定义到屏幕中间位置
		this.setCenterLocation();
		JFrame.setDefaultLookAndFeelDecorated(false);
	}
	/**
	 * 方法说明：创建图标对象
	 * @param path 图片的存放路径
	 * @return ImageIcon
	 */
	protected static ImageIcon createImageIcon(String path){
		ImageIcon image = null;
		try{
			java.net.URL imgURL = MyButtonDemo.class.getClassLoader().getResource(path);
			if(imgURL != null){
				image = new ImageIcon(imgURL);
			}else{
				System.err.println("could not find file: "+path);
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		if(image != null){
			return image;
		}else{
			return null;
		}
	}
	/**
	 * 方法说明：将窗体定位到屏幕中间
	 */
	public void setCenterLocation(){
		Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
		int w = this.getSize().width;
		int h = this.getSize().height;
		System.out.println("宽度: "+w+" ,高度:"+h);
		int x = (dim.width - w)/2;
		int y = (dim.height - h)/2;
		this.setLocation(x, y);
	}
	/**
	 * 方法说明：事件处理
	 */
	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		if("Disable".equals(e.getActionCommand())){
			b1.setEnabled(false);
			b2.setEnabled(false);
			b3.setEnabled(true);
		}else{
			b1.setEnabled(true);
			b2.setEnabled(true);
			b3.setEnabled(false);
		}
	}
	/**
	 * 方法说明：主方法
	 * @param args
	 */
	public static void main(String[] args){
		new MyButtonDemo();
	}
}