checkboxframe.java

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package component;

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

public class CheckBoxFrame extends JFrame implements ItemListener {
  JPanel contentPane;
  JCheckBox jCheckBox1 = new JCheckBox();
  JCheckBox jCheckBox2 = new JCheckBox();
  JCheckBox jCheckBox3 = new JCheckBox();

  public CheckBoxFrame() {
    try {
      //窗口关闭时清空内存
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  
  public static void main(String[] args) {
    CheckBoxFrame frame = new CheckBoxFrame();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    //居中对齐
    frame.setLocation((screenSize.width - frameSize.width) / 2,
        (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }

  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(null);
    this.setSize(new Dimension(400, 300));
    this.setTitle("复选框示例");
    //创建图片图标
    ImageIcon icon1 = new ImageIcon(".\\image\\03.gif");
    ImageIcon icon2 = new ImageIcon(".\\image\\04.gif");
    jCheckBox1.setText("复选框1");
    jCheckBox1.setBounds(new Rectangle(113, 67, 149, 31));
    jCheckBox1.addItemListener(this);
    jCheckBox2.setText("复选框2");
    jCheckBox2.setBounds(new Rectangle(113, 120, 149, 31));
    jCheckBox2.addItemListener(this);
    jCheckBox3.setText("复选框3");
    jCheckBox3.setBounds(new Rectangle(113, 172, 149, 31));
    jCheckBox3.addItemListener(this);
    //设置复选框的图标
    jCheckBox1.setIcon(icon1);
    //设置复选框的被选择的图标
    jCheckBox1.setSelectedIcon(icon2);
    contentPane.add(jCheckBox1, null);
    contentPane.add(jCheckBox2, null);
    contentPane.add(jCheckBox3, null);
  }
  public void itemStateChanged(ItemEvent e) {
    //取得复选框
    JCheckBox tempCheckBox = (JCheckBox)e.getSource();
    if(tempCheckBox.isSelected()){
      JOptionPane.showMessageDialog(null, tempCheckBox.getText() + "被选择.");
    }else{
      JOptionPane.showMessageDialog(null, tempCheckBox.getText() + "取消选择.");
    }
  }
}