PBO 2

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

/**
 * Write a description of class Waktu here.
 * Sebagai tampilan timer
 * @author Thomas Felix
 * @version 19 Oktober 2020
 */

public class Waktu extends JPanel
{
    private int detik;

    public Dimension getPreferredSize()
    {
        FontMetrics fontmet = getFontMetrics(getFont());
        return new Dimension(fontmet.stringWidth("00"), fontmet.getHeight());
    }

    public void setNilai(int newVal)
    {
        if (detik != newVal)
        {
            detik = newVal;
            repaint();
        }
    }

    public int getNilai()
    {
        return detik;
    }

    private String pad(int val)
    {
        return String.format("%02d", val);
    }

    protected void paintComponent(Graphics graph)
    {
        super.paintComponent(graph);
        graph.setFont(new Font("LCD", Font.PLAIN, 15));
        FontMetrics fontmet = getFontMetrics(graph.getFont());

        String text = pad(getNilai());
        int x = (getWidth() - fontmet.stringWidth(text)) / 2;
        int y = ((getHeight() - fontmet.getHeight()) / 2) + fontmet.getAscent();

        graph.drawString(text, x, y);
    }
}