The source code looks like:

import java.applet.*;
import java.awt.*;

public class CheckBoxDemo extends Applet {

	public void init() {
		resize(100, 150);
		setLayout(new FlowLayout(FlowLayout.LEFT));
		add(new Checkbox("Computer", null, true));
		add(new Checkbox("Monitor", null, true));
		add(new Checkbox("Printer"));
		add(new Checkbox("Modem"));
		add(new Checkbox("Keyboard", null, true));
		
	}

}