Digit Pane Java

/**
  * Class untuk menampilkan timer
  */
 import java.awt.*;
 import javax.swing.*;
 public class DigitPane extends JPanel {
   private int second;
   public Dimension getPreferredSize(){
     FontMetrics fm = getFontMetrics(getFont());
     return new Dimension(fm.stringWidth("00"), fm.getHeight());
   }
   // function untuk mengubah nilai timer dan mengupdate tampilan
   public void setValue(int newVal){
     if (second != newVal) {
       second = newVal;
       repaint();
     }
   }
   public int getValue(){
     return second;
   }
   // function u/ menampilkan integer sebagai string
   private String pad(int value){
     return String.format("%02d", value);
   }
   protected void paintComponent(Graphics g){
     super.paintComponent(g);
     g.setFont(new Font("LCD", Font.PLAIN, 24));
     FontMetrics fm = getFontMetrics(g.getFont());
     String text = pad(getValue());
     int x = (getWidth() - fm.stringWidth(text)) / 2;
     int y = ((getHeight()- fm.getHeight()) / 2) + fm.getAscent();
     g.drawString(text, x, y);
   }
 }