SWING组件学习4：复选按钮

import javax.swing.*;

public class JCheckBoxTest extends JFrame{
 JCheckBox c1;
 JCheckBox c2 = new JCheckBox("南京");
 JCheckBox c3 = new JCheckBox("深圳");
 ImageIcon img = new ImageIcon("G://eclipse-work//jswing//imgs//test1.jpg");
 JCheckBoxTest(){
  super("请选择喜欢的城市");
  this.setSize(100,300);
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  //构造函数中的选中
  c1 = new JCheckBox("南京",false);
  //默认选中
  //c1.setSelected(true);
  JPanel p = new JPanel();
  p.add(c1);
  p.add(c2);
  p.add(c3);
  this.setContentPane(p);
 }
 
 public static void main(String[] args) {
  JCheckBoxTest c = new JCheckBoxTest();
  c.show();
 }
}