PBO A - Membuat Jam

Pada kesempatan ini saya mendapatkan tugas membuat jam dengan bahasa Java. berikut saya lampirkan source codenya:

berikut saya lampirkan pula source codenya:

1. clock

 import javax.swing.*;  
 import java.awt.*;  
 import java.awt.event.*;  
 import java.util.Calendar;  
 public class clock extends JFrame{  
      private static final long serialVersionUID = 1L;  
      JTextField timeF;  
      JPanel panel;  
      public clock() {  
           super("Java Clock by Shawn Timothy Mulya Putra");  
           setSize(225,200);  
           setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
           setVisible(true);  
           setResizable(true);  
           setLocationRelativeTo(null);  
           panel = new JPanel ();  
           panel.setLayout(new FlowLayout());  
           timeF = new JTextField(10);  
           timeF.setEditable(false);  
           timeF.setFont(new Font("Arial",Font.PLAIN,48));  
           panel.add(timeF);  
           add(panel);  
           Timer t = new Timer(1000,new Listener());  
           t.start();  
      }  
      class Listener implements ActionListener{  
        public void actionPerformed(ActionEvent e) {  
          Calendar rightNow = Calendar.getInstance();  
          int hour = rightNow.get(Calendar.HOUR_OF_DAY);  
          int min = rightNow.get(Calendar.MINUTE);  
          int sec = rightNow.get(Calendar.SECOND);  
          timeF.setText(hour+":"+min+":"+sec);  
          }  
        }  
 }  

2. excecutor

 public class Executor {  
      public static void main(String[]args) {  
           new Executor();  
      }  
      public Executor() {  
           new clock();  
      }  
 }