Java-java的swing程序设计，为窗体添加多个复选框组件

Question

本人在练习 java 的 swing 程序设计，想为窗体添加多个复选框组件，目标是达到下面图片的效果

我的源代码是这样的：

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;

public class CheckBoxTest extends JFrame {

private static final long serialVersionUID = -5028523145642314067L;

public static void main(String[] args) {
    new CheckBoxTest();
}

public CheckBoxTest() {
    Container c = getContentPane();
    JPanel panel1 = new JPanel();
    JPanel panel2 = new JPanel();
    final JTextArea jt = new JTextArea(20, 50);
    c.setLayout(new BorderLayout());
    c.add(panel1, BorderLayout.NORTH);
    JScrollPane scrollPane = new JScrollPane(jt);
    panel1.add(scrollPane);
    c.add(panel2, BorderLayout.SOUTH);
    for (int i = 0; i < 3; i++) {
        final JButton jb = new JButton("button" + i);
        jb.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                // TODO 自动生成的方法存根
                if (jb.isSelected())
                    jt.append("复选框 i 被选中 n");
            }
        });
        panel2.add(jb);
    }
    setSize(200, 200);
    setVisible(true);
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}

Answer 1

没调试你的代码, 但是这里应该是有问题的:

JButton jb;
jb.isSelected()

没理解错的话, JButton是没有状态的, 你试试JToggleButton.
http://docs.oracle.com/javase/7/docs/api/javax/swing/JToggleButton.html