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POHow to create listener for Calendar in thread
 

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    <p>I've tried to find the solution for two days and still don't know what to do. </p> <p>Here's the situation: I have runnable class where variable of Calendar type doing some increment over time through infinite loop (there's a simplified model in a <em>source 1</em>). Next I have a GUI, where I'm starting new thread (<em>source 2</em>).</p> <p>When a variable 'time' changed, I want to to some math and change some labels on my GUI.</p> <p>As I understand, I should create PropertyChangeListener and this is a place, where I have a problem: I really don't understand how to do it. I've done following things: updated my TimeLoop class to <em>Source 3</em>. I've created listener listed on <em>Source 4</em> (also simplified). And here comes the question: how and where I should initialize listener? Or where am I wrong? Thanks for your answers.</p> <p>P.S. The only Idea I had was (Source 5) and that of course can't work.</p> <hr> <p><strong>Source 1 (example of my runnable class):</strong></p> <pre><code>public class TimeLoop implements Runnable { private Calendar time = Calendar.getInstance(); @Override public void run() { try { time.set(1997, 11, 27, 00, 00, 00); while (true) { time.add(time.HOUR, 1); Thread.sleep(1000); } } catch (InterruptedException ex) { System.out.println("Interrupted error"); } } } </code></pre> <p><strong>Source 2 (source from my GUI class):</strong></p> <pre><code>public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new GUI().setVisible(true); } }); Thread trTime = new Thread(new TimeLoop()); trTime.setName("TimeLoop"); trTime.start(); } </code></pre> <p><strong>Source 3 (Edited runnable class):</strong></p> <pre><code>public class TimeLoop implements Runnable { private Calendar time = Calendar.getInstance(); private PropertyChangeSupport support = new PropertyChangeSupport(this); public void updateTime() { Calendar oldValue = time; time.add(time.HOUR, 1); Calendar newValue = time; support.firePropertyChange("time", oldValue, newValue); } public void addListener(PropertyChangeListener listener) { support.addPropertyChangeListener(listener); } @Override public void run() { try { while (true) { time.set(1997, 11, 27, 00, 00, 00); updateTime(); Thread.sleep(1000); } } catch (InterruptedException ex) { System.out.println("Interrupted error"); } } } </code></pre> <p><strong>Source 4 (Listener):</strong></p> <pre><code>public class TimeListener implements PropertyChangeListener { @Override public void propertyChange(PropertyChangeEvent pce) { System.out.println(pce.getPropertyName() + " has new value); } } </code></pre> <p><strong>Source 5 (Wrong code):</strong></p> <pre><code>public static void main(String args[]) { Thread trTime = new Thread(new TimeLoop()); trTime.setName("TimeLoop"); trTime.start(); TimeLoop tLoop = new TimeLoop(); TimeListener tTistener = new TimeListener(); tLoop.addListener(tTistener); } </code></pre>
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