Programming Forums > Application Development > Java

Dark Flare Knight · Apr 2nd, 2006, 2:27 PM

i was bored and i thought i'd try to make a custom event listener. yesterday i didn't know anything about making a cutom event listener (found it too complicated). today i tried and got the following code:

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//
// TEST.java
//
import javax.swing.event.*;
import java.awt.event.*;
import javax.swing.*;

class TEST implements TimeListener
{
    public void timeChanged (TimeEvent e)
    {
        System.out.println ("Time Event Fired");
    }


    public TEST ()
    {
        addTimeListener (this);
    }


    static public void main (String[] args)
    {
        new TEST ();
    }


   EventListenerList listenerList = new EventListenerList ();

    public void addTimeListener (TimeListener l)
    {
        listenerList.add (TimeListener.class, l);
        Action al = new AbstractAction ()
        {
            public void actionPerformed (ActionEvent e)
            {
                fireTimeEvent (new TimeEvent (this));
            }
        }
        ;
        int delay = 1000;
        new Timer (delay, al).start ();
    }


    public void removeTimeListener (TimeListener l)
    {
        listenerList.remove (TimeListener.class, l);
    }


    void fireTimeEvent (TimeEvent e)
    {
        Object[] listeners = listenerList.getListenerList ();

        for (int i = 0 ; i < listeners.length ; i += 2)
        {
            if (listeners [i] == TimeListener.class)
            {
                ((TimeListener) listeners [i + 1]).timeChanged (e);
            }
        }
    }
}

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//
// TimeEvent.java
//
import java.util.*;
public class TimeEvent extends EventObject
{
    public TimeEvent (Object source)
    {
        super (source);
    }
}

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//
// TimeListener.java
//
import java.util.*;

public interface TimeListener extends EventListener
{
    public void timeChanged (TimeEvent e);
}

i'm not sure if time listener is the best name, but last year, i wanted to make an event that would wait for around 5 seconds and fire itself automatically. so that's why i called this time listener.

could someone give me comments on this.

thanks

groovicus · Apr 2nd, 2006, 10:34 PM

Not that I know anything, but an event that fires after x seconds would simply be a timer. A time listener, to me, would fire an action when a certain time is observed, the same way an event listener fires whenever a given event occurs.

Which one were you going for?

titaniumdecoy · Apr 3rd, 2006, 12:06 AM

I think threads would be your best bet for this sort of thing.

Apr 2nd, 2006, 2:27 PM	#1
Dark Flare Knight Hobbyist Programmer Join Date: Mar 2005 Location: Canada Posts: 113 Rep Power: 4	Time Listener i was bored and i thought i'd try to make a custom event listener. yesterday i didn't know anything about making a cutom event listener (found it too complicated). today i tried and got the following code: (Toggle Plain Text) // // TEST.java // import javax.swing.event.; import java.awt.event.; import javax.swing.; class TEST implements TimeListener { public void timeChanged (TimeEvent e) { System.out.println ("Time Event Fired"); } public TEST () { addTimeListener (this); } static public void main (String[] args) { new TEST (); } EventListenerList listenerList = new EventListenerList (); public void addTimeListener (TimeListener l) { listenerList.add (TimeListener.class, l); Action al = new AbstractAction () { public void actionPerformed (ActionEvent e) { fireTimeEvent (new TimeEvent (this)); } } ; int delay = 1000; new Timer (delay, al).start (); } public void removeTimeListener (TimeListener l) { listenerList.remove (TimeListener.class, l); } void fireTimeEvent (TimeEvent e) { Object[] listeners = listenerList.getListenerList (); for (int i = 0 ; i < listeners.length ; i += 2) { if (listeners [i] == TimeListener.class) { ((TimeListener) listeners [i + 1]).timeChanged (e); } } } } // // TEST.java // import javax.swing.event.; import java.awt.event.; import javax.swing.; class TEST implements TimeListener { public void timeChanged (TimeEvent e) { System.out.println ("Time Event Fired"); } public TEST () { addTimeListener (this); } static public void main (String[] args) { new TEST (); } EventListenerList listenerList = new EventListenerList (); public void addTimeListener (TimeListener l) { listenerList.add (TimeListener.class, l); Action al = new AbstractAction () { public void actionPerformed (ActionEvent e) { fireTimeEvent (new TimeEvent (this)); } } ; int delay = 1000; new Timer (delay, al).start (); } public void removeTimeListener (TimeListener l) { listenerList.remove (TimeListener.class, l); } void fireTimeEvent (TimeEvent e) { Object[] listeners = listenerList.getListenerList (); for (int i = 0 ; i < listeners.length ; i += 2) { if (listeners [i] == TimeListener.class) { ((TimeListener) listeners [i + 1]).timeChanged (e); } } } } (Toggle Plain Text) // // TimeEvent.java // import java.util.; public class TimeEvent extends EventObject { public TimeEvent (Object source) { super (source); } } // // TimeEvent.java // import java.util.; public class TimeEvent extends EventObject { public TimeEvent (Object source) { super (source); } } (Toggle Plain Text) // // TimeListener.java // import java.util.; public interface TimeListener extends EventListener { public void timeChanged (TimeEvent e); } // // TimeListener.java // import java.util.; public interface TimeListener extends EventListener { public void timeChanged (TimeEvent e); } i'm not sure if time listener is the best name, but last year, i wanted to make an event that would wait for around 5 seconds and fire itself automatically. so that's why i called this time listener. could someone give me comments on this. thanks

Apr 2nd, 2006, 10:34 PM	#2
groovicus Programmer Join Date: Nov 2004 Posts: 84 Rep Power: 5	Not that I know anything, but an event that fires after x seconds would simply be a timer. A time listener, to me, would fire an action when a certain time is observed, the same way an event listener fires whenever a given event occurs. Which one were you going for? __________________ HijackThis Team-SFDC

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Apr 3rd, 2006, 12:06 AM	#3
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 930 Rep Power: 4	I think threads would be your best bet for this sort of thing.

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Programming Forums > Application Development > Java

Time Listener