Java Concurrency

**aknessy** · November 17th, 2013, 12:20 PM

Hello Guys! I want to display a JFrame during execution of a timer, so far i've tried but failed. The following code is what i have done so far, dont know if am doing the right thing:

 
/**
 * 
 */
package logRemainder;
 
import javax.swing.JOptionPane;
 
import java.awt.Toolkit;
import java.util.Date;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
 
import gui.CreateLogRemainder;
/**
 * @author aknessy
 *
 */
public class RemainderBeep{
	private Timer timer;
	private Toolkit toolkit;
	private int time;
	private static int numOfBeeps = 10;
 
		public void Beep(){
			timer = new Timer();
			toolkit = Toolkit.getDefaultToolkit();
			Calendar calendar = Calendar.getInstance();
			String getCloseTime = JOptionPane.showInputDialog(null, "<html><body><font color='green'>"
					+ "Please Enter Today's Closing Time: </font><br>"
					+ "<font color='red'><p align='center'> 1 - 24HRS!</p></font>");
 
			time = Integer.parseInt(getCloseTime);
 
			calendar.set(Calendar.HOUR_OF_DAY, time);
			calendar.set(Calendar.MINUTE, 20);
			calendar.set(Calendar.SECOND, 0);
			Date time = calendar.getTime();
 
			timer.schedule(new RemainderTask(), time, 1*2000);
 
		}
 
		class RemainderTask extends TimerTask{
			public void run(){
 
				if(numOfBeeps > 0){
					toolkit.beep();
 
					 Thread td = new Thread(){
						 public void run(){
							 new gui.CreateLogRemainder();
						 }
					 };
					 	td.start();
 
			numOfBeeps--;	
			}else{
				toolkit.beep();
				timer.cancel();
			}
		}
	}
 
		public static void main (String[] args){
			new RemainderBeep().Beep();
		}
}

I tried executing the programming without creating a new thread, but it didn't work! I have tried the same program with the Swing's Timer class and without a thread, the new Frame is displayed but the Toolkit does not beep.

**GregBrannon** · November 17th, 2013, 01:08 PM

I don't see a JFrame and it's disappointing that the code you posted doesn't have a single comment. What's it supposed to do?

**aknessy** · November 17th, 2013, 02:59 PM

That's true @GregBrannon., I apologize for the error! There's a Call to CreateLogRemainder Class within the run() method of the Thread, it contains the JFrame that I want to display while the Timer is active and while the Toolkit is beeping! That's basically what I want to achieve!

**GregBrannon** · November 17th, 2013, 04:28 PM

Oh. That's fairly important info to include.

Correct me if I'm wrong: You want to display a JFrame for either a total amount of time set by the user or starting at a certain time and ending at a specified later time, beeping every 2 seconds while the JFrame is displayed. Is that right? If not, please restate.

**aknessy** · November 17th, 2013, 08:04 PM

Exactly! I want the JFrame to start at the exact same time as the Timer and ending at the same time.

**aknessy** · November 22nd, 2013, 10:19 AM

@GregBrannon whats up Elite? Been expecting your reply since your last post! can see you are in a relax mood.

**GregBrannon** · November 22nd, 2013, 10:28 AM

I work. Weekends allow more time to consider the possiblities and respond; weekdays are limited to simpler, shorter problems. In this case, you haven't given us much to work with.

Try writing a simple program that opens a JFrame when the timer starts and closes it when it ends. I'd probably use a JDialog instead of a JFrame to control modality, but since I don't have a complete picture of what you're doing, the other GUI elements involved, etc., so I'm not sure what's best. It doesn't seem too complicated, but I haven't worked it through.

**aknessy** · November 22nd, 2013, 12:31 PM

Okay.. No problems! I just nid to figure it out, thanks though!

**GregBrannon** · November 22nd, 2013, 12:45 PM

Here's a simple demo of what I was thinking you could do. Let me know if you have any questions.

Edit: Modified to actually show a JDialog to ensure that the javax.swing.Timer exists long enough to complete the demonstration.

import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
import javax.swing.JDialog;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
 
// class TimerDemo demonstrates how a javax.swing.Timer could be
// used to perform any action after a set amount of time
public class TimerDemo implements ActionListener
{
    Timer demoTimer;
    JDialog dialog;
 
    // a constructor that could be used to set the parameters
    // of the timer, especially the duration of the desired action
    public TimerDemo()
    {
        // define the timer with an initial delay and time between
        // events of 5,000 ms 
        demoTimer = new Timer( 5000, this );
 
        // create a JDialog to show while the timer is running
        dialog = new JDialog();
        dialog.setModalityType( Dialog.ModalityType.MODELESS );
        dialog.setSize( new Dimension( 400, 400 ) );
        dialog.setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE );
        dialog.setLocationRelativeTo( null );
        dialog.setVisible( true );
 
        // simulate opening the JDialog here (start the desired action)
        System.out.println( "Opening the JDialog . . ." );
 
        // start the timer that will delay 5 seconds and then fire
        // the event that triggers the action listener
        demoTimer.start();
 
    } // end constructor
 
    // a standard main() method to launch the swing app on the EDT
    public static void main( String[] args )
    {
        SwingUtilities.invokeLater( new Runnable()
        {
            @Override
            public void run()
            {
                new TimerDemo();
            }
        } );
 
    } // end method main()
 
    // method actionPerformed() is run when the action listener event
    // is triggered by the timer to simulate closing the JDialog or 
    // ending the desired event after the desired amount of time
    @Override
    public void actionPerformed( ActionEvent ae )
    {
        // simulate closing the JDialog (end the desired action)
        System.out.println( "The JDialog is closing" );
 
        // then stop the timer so the action doesn't repeat
        demoTimer.stop();
 
        // close the dialog
        dialog.dispose();
 
    } // end method actionPerformed()
 
} // end class TimerDemo

**aknessy** · November 22nd, 2013, 01:14 PM

Thanks man! Your response alone is really a psychological boost! Thanks again!!

**GregBrannon** · November 22nd, 2013, 01:23 PM

Your response alone is really a psychological boost!

I don't get that too often, unless you're standing on a ledge somewhere, contemplating stepping off.

If not (and I hope not), glad that I boosted you.

**aknessy** · November 22nd, 2013, 01:38 PM

Working for weeks to complete a project out weighs that... It's infact
"Stepping off the edge"! Thanks really, now I can go figure everything! Except I run into another "cyclope"!

**GregBrannon** · November 22nd, 2013, 04:38 PM

Except I run into another "cyclope"!

Not sure what that means. When you can explain it and need more help, ask. Post your latest code when you do.

Edit: I updated my demo code. I realized that without a Swing component visible, the behavior or lifespan of the javax.swing.Timer is unpredictable.

**aknessy** · November 24th, 2013, 07:18 AM

Hi @GregBrannon Its been awhile! You requested I post the latest code; fortunately i've solved "The Problem". It turned out that the designer (JiGloo) i was working with had a serious beef with me! So here it is:

 
/**
 * 
 */
package logRemainder;
 
import javax.swing.JOptionPane;
 
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
import gui.CreateLogRemainder;
 
/**
 * @author aknessy
 *
 */
public class RemainderBeep{
	private Timer timer;
	private Toolkit toolkit;
	private int time;
	private static int numOfBeeps = 10;
	private javax.swing.Timer swingTimer; 
	private CreateLogRemainder fm = new CreateLogRemainder();
 
		public void Beep(){
			timer = new Timer();
			toolkit = Toolkit.getDefaultToolkit();
			Calendar calendar = Calendar.getInstance();
 
			/**
			 * Get The Time...
			 */
 
			String getCloseTime = JOptionPane.showInputDialog(null, "<html><body><font color='green'>"                                                                                                                                                                                                                                                                                                      
					+ "Please Enter Today's Closing Time: </font><br>"
					+ "<font color='red'><p align='center'> 1 - 24HRS!</p></font>");
			time = Integer.parseInt(getCloseTime);
 
			/** 
			 * Use The collected time with a Calendar Instance
			 */
 
			calendar.set(Calendar.HOUR_OF_DAY, time);
			calendar.set(Calendar.MINUTE, 0);
			calendar.set(Calendar.SECOND, 0);
			Date time = calendar.getTime();
 
			timer.schedule(new RemainderTask(), time, 1*2000);
 
			/**
			 * A Swing Timer To Display
			 * The MessagePanel
			 */
 
			swingTimer = new javax.swing.Timer(1000, new swingTimerListener());
			swingTimer.setDelay(40);
			swingTimer.setCoalesce(true);
			swingTimer.setRepeats(false);
			swingTimer.start();
 
		}
 
		/**
		 * This Remainder Class counts down to zero,
		 * and sets a Toolkit object to beep during
		 * this count-down.
		 * 
		 *  If the count-down is equal to zero,
		 *  stop the java.util.Timer, stop the swing timer
		 *  and dispose the MessagePanel.
		 */
 
		class RemainderTask extends TimerTask{
			public void run(){
 
				if(numOfBeeps > 0){
					toolkit.beep();
 
			numOfBeeps--;	
			}else{
				toolkit.beep();
				timer.cancel();
				swingTimer.stop();
				fm.dispose();
			}
		}
	}
 
		public static void main (String[] args){
			new RemainderBeep().Beep();
		}
 
		class swingTimerListener implements ActionListener{
			public void actionPerformed(ActionEvent ae){
				fm.TestFadeLabel();
			}
		}
}

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