>>359
適当に作ってみた
かっこよくは自分でなんとかしてくれ

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

public class DigitalClock extends JPanel {
int hour, minute, second;
int beepH, beepM, beepS;
boolean alarm = false;

JComponent canvas;
JRadioButton[] rb = new JRadioButton[4];