JCheckBox演示操作

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
/**
 * Title:演示JCheckBox使用
 * Description:通过勾选不同的复选框来显示不同的图片
 * @author fan
 *
 */
public class MyCheckDemo extends JFrame implements ItemListener{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * 定义四个复选框
	 */
	JCheckBox chinCheck, glassesCheck, hairCheck, teetchCheck;
	/**
	 * 定义一个JLabel用来进行图片的显示
	 */
	JLabel pictureLabel;
	/**
	 * 定义一个StringBuffer来标记需要进行显示的图片，利用setChar(int, char)来进行
	 */
	StringBuffer choices = new StringBuffer("cght");
	/**
	 * 构造方法
	 */
	public MyCheckDemo(){
		lunchFrame();
	}
	/**
	 * 进行界面的构造
	 */
	public void lunchFrame(){
		this.setLayout(new BorderLayout());
		JPanel check_Panel = new JPanel();
		chinCheck = new JCheckBox("下巴(c)");
		glassesCheck = new JCheckBox("眼镜(g)");
		hairCheck = new JCheckBox("头发(h)");
		teetchCheck = new JCheckBox("牙齿(t)");
		
		chinCheck.setSelected(true);
		glassesCheck.setSelected(true);
		hairCheck.setSelected(true);
		teetchCheck.setSelected(true);
		
		chinCheck.addItemListener(this);
		glassesCheck.addItemListener(this);
		hairCheck.addItemListener(this);
		teetchCheck.addItemListener(this);
		
		check_Panel.setLayout(new GridLayout(0, 1));
		check_Panel.add(chinCheck);
		check_Panel.add(glassesCheck);
		check_Panel.add(hairCheck);
		check_Panel.add(teetchCheck);
		
		JPanel pic_Panel = new JPanel();
		pictureLabel = new JLabel();
		pictureLabel.setFont(pictureLabel.getFont().deriveFont(Font.ITALIC));
		this.updatePicture();
		pic_Panel.add(pictureLabel);
		
		this.getContentPane().add(check_Panel, BorderLayout.LINE_START);
		this.getContentPane().add(pic_Panel, BorderLayout.CENTER);
		
		
		this.setTitle("CheckDemo");
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.pack();
		this.setCenterLocation();
	}
	/** 
	 * 方法说明：将窗体定义到屏幕中间
	 */
	private 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：生产图标
	 * @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;
		}
	}
	/**
	 * 进行图片的更新
	 */
	public void updatePicture(){
		//
		ImageIcon icon = createImageIcon("base2011/images/geek/geek-"
				+choices.toString()+".gif");
		if(icon == null){
			pictureLabel.setText("没有发现图片");
		}else{
			pictureLabel.setIcon(icon);
			pictureLabel.setToolTipText(choices.toString());
		}
		
	}
	
	/**
	 * 事件处理
	 */
	@Override
	public void itemStateChanged(ItemEvent e) {
		// TODO Auto-generated method stub
		int index = 0;
		char c = '-';
		//选择事件发生
		Object source = e.getSource();
		if(source == chinCheck){
			index = 0;
			c = 'c';
		}else if(source == glassesCheck){
			index = 1;
			c = 'g';
		}else if(source == hairCheck){
			index = 2;
			c = 'h';
		}else if(source == teetchCheck){
			index = 3;
			c = 't';
		}
		//取消选择事件
		if(e.getStateChange() == ItemEvent.DESELECTED){
			c = '-';
		}
		//该标识的名字
		choices.setCharAt(index, c);
		//更新图片
		updatePicture();
	}
	/**
	 * 主方法
	 */
	public static void main(String[] args){
		new MyCheckDemo();
	}
	
	
	
}