Check1.java

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

/**
JCheckBox demo with ActionListener.
*/
public class Check1 extends JFrame
{
    public static void main(String[] argv)
    {
        Check1 t = new Check1();
        t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        t.show();
    }

    public Check1()
    {
        Toolkit kit = Toolkit.getDefaultToolkit();
        Dimension ss = kit.getScreenSize();
        setSize(ss.width/2,ss.height/6);
        setLocation(ss.width/4,ss.height/4);
        setTitle("CISC370-011 -- JCheckBox demo");

        Container cp = getContentPane();
        JPanel p = new JPanel();
        cp.add(p);

        JLabel label = new JLabel("Pick your favorite dwarfs:");
        cp.add(label,BorderLayout.NORTH);

        String[] labels = {
            "Happy",
            "Sleepy",
            "Dopey",
            "Grumpy",
            "Sneezy",
            "Doc",
            "Bashful",
            };
        for (int i=0; i<labels.length; i++) {
            JCheckBox box = new JCheckBox(labels[i]);
            p.add(box);
            box.setSelected(i%2 == 0);
            box.addActionListener(new Checker(labels[i],box));
            }
    }
}


/**
An ActionListener to watch for changes in a JCheckBox.
*/
class Checker implements ActionListener
{
    public Checker(String name,JCheckBox box)
    {
        this.name = name;
        this.box = box;
    }

    public void actionPerformed(ActionEvent e)
    {
        System.out.println(name + " -> " + box.isSelected());
    }

    private String name;
    private JCheckBox box;
}