Cara membuat program Java StopWatch

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Proses extends Thread
{
private JLabel tampilan;
private boolean selesai;
private boolean aktif;
private int jam,menit,detik,perSeratusDetik;
public Proses (JLabel tampilan)
{
super();
this.tampilan = tampilan;
this.selesai = false;
this.aktif=false;
this.jam=0;
this.menit=0;
this.detik=0;
this.perSeratusDetik=0;
}
public void run()
{
String tampil=" ";
while (!selesai)
{
if(aktif)
{
tampil=Integer.toString(jam)+":";
tampil+=Integer.toString(menit)+":";
tampil+=Integer.toString(detik)+":";
tampil+=Integer.toString(perSeratusDetik);
tampilan.setText(tampil);
perSeratusDetik++;
if(perSeratusDetik==100);
{
perSeratusDetik=0;
detik++;
if(detik==60)

{
detik = 0;
menit++;
if(menit==60)
{
menit=0;
jam++;
if (jam==24);
{
jam=0;
}
}

}
}
try
{
sleep(10);

}
catch(Exception e){}
}

}

}
public void aktifkan()
{
aktif=true;
}
public void mati()
{
selesai=true;
}
}
class Stopwatch extends JFrame implements ActionListener
{
private JLabel penghitung = new JLabel("0:0:0:0");
private Proses proses = new Proses (penghitung);
private Button mulai = new Button("Mulai");
private Button keluar = new Button("Keluar");
private JPanel panel = new JPanel();
public Stopwatch()
{
super("Stopwatch");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(200,150);
setLocation(200,100);
setResizable(false);
penghitung.setFont(new Font ("verdana",Font.BOLD,25));
penghitung.setForeground(Color.red);
penghitung.setHorizontalAlignment(JLabel.CENTER);
mulai.setFont(new Font ("verdana",Font.PLAIN,20));
mulai.setForeground(Color.blue);
keluar.setFont(new Font ("verdana",Font.PLAIN,20));
keluar.setForeground(Color.blue);
mulai.addActionListener(this);
keluar.addActionListener(this);
panel.setLayout(new GridLayout (1,2));
panel.add(mulai);
panel.add(keluar);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(penghitung,BorderLayout.CENTER);
getContentPane().add(panel,BorderLayout.SOUTH);
show();
proses.start();
}
public void actionPerformed(ActionEvent e)
{
Object obyek = e.getSource();
if(obyek==mulai)
{
if(mulai.getLabel().equals("Mulai"))
{
mulai.setLabel("Berhenti");
proses.aktifkan();
}
else
{
mulai.setLabel("Mulai");
proses.mati();
}
}
else
if(obyek==keluar)
{
System.exit(0);
}
}
public static void main(String[]args)
{
new Stopwatch();
}
}


Tampilan

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