Clock (Java Applet)

import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
/**
* Program Jam analog
*
* @author Dwinanda Bagoes Ansori
* @version 15 December 2020
*/
public class Clock extends Applet implements Runnable {
    private volatile Thread timer;
    private int lastxs, lastys, lastxm, lastym, lastxh, lastyh;
    private SimpleDateFormat formatter;
    private String lastdate;
    private Font clockFaceFont;
    private Date currentDate;
    private Color handColor;
    private Color numberColor;
    private int xcenter = 80, ycenter = 55;

    public void init()
    {
        int x,y;
        lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
        formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy",
        Locale.getDefault());
        currentDate = new Date();
        lastdate = formatter.format(currentDate);
        clockFaceFont = new Font("Serif", Font.PLAIN, 14);
        handColor = Color.green;
        numberColor = Color.black;

        try
        {
            setBackground(new Color(Integer.parseInt(getParameter("bgcolor"), 16)));
        }
        catch (NullPointerException e) { }
        catch (NumberFormatException e) { }
        try
        {
            handColor = new Color(Integer.parseInt(getParameter("fgcolor1"), 16));
        }
        catch (NullPointerException e) { }
        catch (NumberFormatException e) { }
        try
        {
            numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"), 16));
        }
        catch (NullPointerException e) { }
        catch (NumberFormatException e) { }
        resize(300,300); // Set clock window size
    }
    public void update(Graphics g)
    {
        int xh, yh, xm, ym, xs, ys;
        int s = 0, m = 10, h = 10;
        String today;

        currentDate = new Date();

        formatter.applyPattern("s");
        try
        {
            s = Integer.parseInt(formatter.format(currentDate));
        }
        catch (NumberFormatException n)
        {
            s = 0;
        }
        formatter.applyPattern("m");
        try
        {
            m = Integer.parseInt(formatter.format(currentDate));
        }
        catch (NumberFormatException n)
        {
            m = 10;
        }
        formatter.applyPattern("h");
        try
        {
            h = Integer.parseInt(formatter.format(currentDate));
        }
        catch (NumberFormatException n)
        {
            h = 10;
        }

        // Set position of the ends of the hands
        xs = (int) (Math.cos(s * Math.PI / 30 - Math.PI / 2) * 45 + xcenter);
        ys = (int) (Math.sin(s * Math.PI / 30 - Math.PI / 2) * 45 + ycenter);
        xm = (int) (Math.cos(m * Math.PI / 30 - Math.PI / 2) * 40 + xcenter);
        ym = (int) (Math.sin(m * Math.PI / 30 - Math.PI / 2) * 40 + ycenter);
        xh = (int) (Math.cos((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30 + xcenter);
        yh = (int) (Math.sin((h*30 + m / 2) * Math.PI / 180 - Math.PI / 2) * 30 + ycenter);

        // Get the date to print at the bottom
        formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
        today = formatter.format(currentDate);

        g.setFont(clockFaceFont);
        // Erase if necessary
        g.setColor(getBackground());
        if (xs != lastxs || ys != lastys)
        {
            g.drawLine(xcenter, ycenter, lastxs, lastys);
            g.drawString(lastdate, 5, 125);
        }
        if (xm != lastxm || ym != lastym)
        {
            g.drawLine(xcenter, ycenter-1, lastxm, lastym);
            g.drawLine(xcenter-1, ycenter, lastxm, lastym);
        }
        if (xh != lastxh || yh != lastyh)
        {
            g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
            g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
        }

        // Draw date and hands
        g.setColor(numberColor);
        g.drawString(today, 5, 125);
        g.drawLine(xcenter, ycenter, xs, ys);
        g.setColor(handColor);
        g.drawLine(xcenter, ycenter-1, xm, ym);
        g.drawLine(xcenter-1, ycenter, xm, ym);
        g.drawLine(xcenter, ycenter-1, xh, yh);
        g.drawLine(xcenter-1, ycenter, xh, yh);
        lastxs = xs; lastys = ys;
        lastxm = xm; lastym = ym;
        lastxh = xh; lastyh = yh;
        lastdate = today;
        currentDate = null;
    }
    // Paint is the main part of the program
    public void paint(Graphics g)
    {
        g.setFont(clockFaceFont);
        // Draw the circle and numbers
        g.setColor(handColor);
        g.drawArc(xcenter-50, ycenter-50, 100, 100, 0, 360);
        g.setColor(numberColor);
        g.drawString("9", xcenter-45, ycenter+3);
        g.drawString("3", xcenter+40, ycenter+3);
        g.drawString("12", xcenter-5, ycenter-37);
        g.drawString("6", xcenter-3, ycenter+45);

        // Draw date and hands
        g.setColor(numberColor);
        g.drawString(lastdate, 5, 125);
        g.drawLine(xcenter, ycenter, lastxs, lastys);
        g.setColor(handColor);
        g.drawLine(xcenter, ycenter-1, lastxm, lastym);
        g.drawLine(xcenter-1, ycenter, lastxm, lastym);
        g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
        g.drawLine(xcenter-1, ycenter, lastxh, lastyh);
    }
    public void start()
    {
        timer = new Thread(this);
        timer.start();
    }
    public void stop()
    {
        timer = null;
    }
    public void run()
    {
        Thread me = Thread.currentThread();
        while (timer == me)
        {
            try
            {
                Thread.currentThread().sleep(100);
            }
            catch (InterruptedException e)
            {
            }
            repaint();
        }
    }
    public String getAppletInfo()
    {
        return "Title: Jam \n" + "Author: Dwinanda Bagoes Ansori, 2020 \n" + "menampilkan jam analog";
    }
    public String[][] getParameterInfo()
    {
        String[][] info =
        {
            {"bgcolor", "hexadecimal RGB number", "Warna background adalah warna dari default browser."},
            {"fgcolor1", "hexadecimal RGB number", "Warna jarum pada jam adalah hijau."},
            {"fgcolor2", "hexadecimal RGB number", "Warna jarum detik dan angka pada jam adalah hitam."}
        };
        return info;
    }
}