The JCheckBox Class

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

public class JChecjBoxDemo {
	public static void main(String[] args) {
		JCheckBox check1 = new JCheckBox("first");
		JCheckBox check2 = new JCheckBox("second");
		
		check1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ev) {
				System.out.println("first checked");
			}
		});
		
		check2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ev) {
				System.out.println("second checked");
			}
		});
		
		JFrame f = new JFrame();
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = f.getContentPane();
		c.setLayout(new FlowLayout());
		c.add(check1);
		c.add(check2);
		f.pack();
		f.setVisible(true);
		
	}
}