Tugas PBO - Jam Digital

Nama: Donny Fitrado
NRP: 05111740000171
Kelas: PBO A

Berikut ini adalah class dan source code yang digunakan untuk membuat jam sederhana.

1. NumberDisplay

  /**   
  * tugas membuat jam   
  *   
  * Donny Fitrado  
  * 05111740000171 - PBO A  
  * 30-9-2018   
  */    
  public class NumberDisplay   
  {   
   private int limit;   
   private int value;   
   public NumberDisplay(int rollOverLimit)   
   {   
    limit = rollOverLimit;   
    value = 0;   
   }   
   public int getValue()   
   {   
    return value;   
   }   
   public void setValue(int replacementValue)   
   {   
    if((replacementValue >= 0) && (replacementValue < limit)) {   
       value = replacementValue;   
    }   
   }   
   public String getDisplayValue()   
   {   
    if(value < 10) {   
     return "0" +value ;   
    }   
    else {   
     return "" +value ;   
    }   
   }   
   public void increment()   
   {   
    value = (value + 1) % limit;   
   }   
  }

2. ClockDisplay

  /**   
  * tugas membuat jam   
  *   
  * Donny Fitrado   
  * 05111740000171 - PBO A  
  * 30-9-2018   
  */    
  public class ClockDisplay   
  {   
   private NumberDisplay hours;   
   private NumberDisplay minutes;   
   private String displayString; //simulates the actual display   
   public ClockDisplay()   
   {   
    hours = new NumberDisplay(24);   
    minutes = new NumberDisplay(60);   
    updateDisplay();   
   }   
   public ClockDisplay(int hour, int minute)   
   {   
    hours = new NumberDisplay(24);   
    minutes = new NumberDisplay(60);   
    setTime(hour, minute);   
   }   
   public void timeTick()   
   {   
    minutes.increment();   
    if(minutes.getValue() == 0) { //it just rolled over   
     hours.increment();   
    }   
    updateDisplay();   
   }   
   public void setTime(int hour, int minute)   
   {   
    hours.setValue(hour);   
    minutes.setValue(minute);   
    updateDisplay();   
   }   
   public String getTime()   
   {   
    return displayString;   
   }   
   private void updateDisplay()   
   {   
    displayString = hours.getDisplayValue() + ":" +   
        minutes.getDisplayValue();   
   }   
  }

3. TestClockDisplay

  /**   
  * tugas membuat jam  
  *   
  * Donny Fitrado  
  * 05111740000171 - PBO A  
  * 30-9-2018   
  */    
  public class TestClockDisplay   
  {   
   public void test()   
   {   
    ClockDisplay clock = new ClockDisplay();   
    clock.setTime(0,0);   
    System.out.println(clock.getTime());   
    clock.setTime(5,30);   
    System.out.println(clock.getTime());   
    clock.setTime(20,00);   
    System.out.println(clock.getTime());   
    clock.setTime(23,59);   
    System.out.println(clock.getTime());   
   }   
  }

Berikut ini adalah tampilannya ketika dijalankan:

Lalu, saya membuat jam yang memiliki tampilan grafis. Berikut ini adalah classnya:

ClockGUI

  /**   
  * tugas bikin jam   
  *   
  * Donny Fitrado  
  * 05111740000171 - PBO A  
  * 30-9-2018   
  */    
  import javax.swing.*;   
  import javax.swing.border.*;   
  import java.awt.*;   
  import java.awt.event.*;   
  public class ClockGUI    
  {    
   private JFrame frame;    
   private JLabel label;    
   private ClockDisplay clock;    
   private boolean clockOn = false;    
   private TimerThread timerThread;    
   public void Clock()    
   {    
   makeFrame();    
   clock = new ClockDisplay();    
   }    
   private void start()    
   {    
   clockOn = true;    
   timerThread = new TimerThread();    
   timerThread.start();    
   }    
   private void stop()    
   {    
   clockOn = false;    
   }    
   private void step()    
   {    
   clock.timeTick();    
   label.setText(clock.getTime());    
   }    
   private void showTentang()    
   {    
   JOptionPane.showMessageDialog (frame, "Jam Digital\n" +    
   "Jam digital dengan Bahasa Java.",    
   "Tentang",   
   JOptionPane.INFORMATION_MESSAGE);    
   }    
   private void quit()    
   {    
   System.exit(0);    
   }    
   private void makeFrame()    
   {    
   frame = new JFrame("Jam");    
   JPanel contentPane = (JPanel)frame.getContentPane();    
   contentPane.setBorder(new EmptyBorder(1,60,1,60));    
   makeMenuBar(frame);    
   contentPane.setLayout(new BorderLayout(12,12));    
   label = new JLabel("00:00", SwingConstants.CENTER);    
   Font displayFont = label.getFont().deriveFont(96.0f);    
   label.setFont(displayFont);    
   contentPane.add(label, BorderLayout.CENTER);    
   JPanel toolbar = new JPanel();    
   toolbar.setLayout(new GridLayout(1,0));    
   JButton startButton = new JButton("Start");    
   startButton.addActionListener(e->start());    
   toolbar.add(startButton);    
   JButton stopButton = new JButton("Stop");    
   stopButton.addActionListener(e->stop());    
   toolbar.add(stopButton);    
   JButton stepButton = new JButton("Step");    
   stepButton.addActionListener(e->step());    
   toolbar.add(stepButton);    
   JPanel flow = new JPanel();    
   flow.add(toolbar);    
   contentPane.add(flow, BorderLayout.SOUTH);    
   frame.pack();    
   Dimension d = Toolkit.getDefaultToolkit().getScreenSize();    
   frame.setLocation(d.width/2 - frame.getWidth()/2, d.height/2 - frame.getHeight()/2);    
   frame.setVisible(true);    
   }    
   private void makeMenuBar(JFrame frame)    
   {    
   final int SHORTCUT_MASK =    
   Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();    
   JMenuBar menubar = new JMenuBar();    
   frame.setJMenuBar(menubar);    
   JMenu menu;    
   JMenuItem item;    
   menu = new JMenu("File");    
   menubar.add(menu);    
   item = new JMenuItem("Tentang Jam...");    
    item.addActionListener(e->showTentang());    
   menu.add(item);    
   menu.addSeparator();    
   item = new JMenuItem("Quit");    
    item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,SHORTCUT_MASK));    
    item.addActionListener(e->quit());    
   menu.add(item);    
   }    
   class TimerThread extends Thread    
   {    
   public void run()    
    {    
    while(clockOn)    
    {    
     step();    
     tunda();    
    }    
    }    
    private void tunda()    
    {    
    try    
    {    
     Thread.sleep(900);    
    }    
    catch(InterruptedException exc)    
    {    
    }    
   }    
   }    
  }

Berikut ini adalah hasilnya:
1. Tampilan