Java中JCheckBox的使用

/**
*
*/
package com.duoguo.button;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/**
* @author shyboy([e-mail])
*
*/
@SuppressWarnings("serial")
public class CheckBoxDemo extends JPanel implements ItemListener {

private JCheckBox chinCheckBox;// 下巴复选框

private JCheckBox glassesCheckBox;// 眼睛复选框

private JCheckBox hairCheckBox;// 头发复选框

private JCheckBox toothCheckBox;// 牙齿复选框

private JPanel topPanel;

private JPanel bottomPanel;

private StringBuilder choices;

private JLabel pictureLabel;

/**
* 构造方法
*/
public CheckBoxDemo() {
chinCheckBox = new JCheckBox("下巴");
chinCheckBox.setMnemonic(KeyEvent.VK_1);// 快捷键ALT+1
chinCheckBox.setSelected(true);

glassesCheckBox = new JCheckBox("眼睛");
glassesCheckBox.setMnemonic(KeyEvent.VK_2);// 快捷键ALT+2
glassesCheckBox.setSelected(true);

hairCheckBox = new JCheckBox("头发");
hairCheckBox.setMnemonic(KeyEvent.VK_3);
hairCheckBox.setSelected(true);

toothCheckBox = new JCheckBox("牙齿");
toothCheckBox.setMnemonic(KeyEvent.VK_4);
toothCheckBox.setSelected(true);

chinCheckBox.addItemListener(this);
glassesCheckBox.addItemListener(this);
hairCheckBox.addItemListener(this);
toothCheckBox.addItemListener(this);

topPanel = new JPanel(new GridLayout(1, 4));
topPanel.add(chinCheckBox);
topPanel.add(glassesCheckBox);
topPanel.add(hairCheckBox);
topPanel.add(toothCheckBox);

choices = new StringBuilder("cght");
pictureLabel = new JLabel();
updatePicture();

bottomPanel = new JPanel(new FlowLayout());
bottomPanel.add(pictureLabel);

setLayout(new BorderLayout());
this.add(topPanel, BorderLayout.NORTH);
this.add(bottomPanel, BorderLayout.CENTER);
}

/**
* 更新图片
*/
public void updatePicture() {
ImageIcon imageIcon = createImageIcon("images/geek-"
+ choices.toString() + ".gif");

pictureLabel.setIcon(imageIcon);
pictureLabel.setToolTipText(choices.toString());

if (null == imageIcon) {
pictureLabel.setText("无图片");
} else {
pictureLabel.setText(null);
}
}

/**
* 设置复选框对应的相应图标
*
* @param path
* ：图片路径
* @return ImageIcon
*/
public static ImageIcon createImageIcon(String path) {
if (null != path && !"".equals(path)) {
URL url = CheckBoxDemo.class.getResource(path);

if (null != url) {
return new ImageIcon(url);
} else {
System.err.println("找不到图片的……");
return null;
}
}

return null;
}

/**
* 创建并显示相应的界面
*/
public static void createAndShowGUI() {
JFrame jFrame = new JFrame("Swing中的JCheckBox");
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 当窗口被关闭时应用程序退出

CheckBoxDemo checkBoxDemo = new CheckBoxDemo();
checkBoxDemo.setOpaque(true);

jFrame.setContentPane(checkBoxDemo);
jFrame.pack();
jFrame.setVisible(true);
jFrame.setSize(500, 300);
jFrame.setLocation(300, 200);
}

/*
* (non-Javadoc)
*
* @see
* java.awt.event.ItemListener#itemStateChanged(java.awt.event.ItemEvent)
*/
@Override
public void itemStateChanged(ItemEvent e) {
int index = 0;
char c = '-';

Object source = e.getItemSelectable();
if (source == chinCheckBox) {
index = 0;
c = 'c';
} else if (source == glassesCheckBox) {
index = 1;
c = 'g';
} else if (source == hairCheckBox) {
index = 2;
c = 'h';
} else if (source == toothCheckBox) {
index = 3;
c = 't';
}

if (e.getStateChange() == ItemEvent.DESELECTED) {
c = '-';
}

choices.setCharAt(index, c);
updatePicture();
}

/**
* @param args
*/
public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

@Override
public void run() {

createAndShowGUI();

}
});

}

}