Need some help in a timer

**Norm** · April 27th, 2014, 04:22 PM

I can't tell without seeing it.
Post the code and the full text of the error message.

**Kerooker** · April 27th, 2014, 04:31 PM

package cupTimer;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.GregorianCalendar;
import javax.swing.* ;
 
public class myTimer {
 
	public static void main(String[] args) throws InterruptedException {
		int delay = 1000; //milliseconds
		  ActionListener taskPerformer = new ActionListener() {
		      public void actionPerformed(ActionEvent evt) {
	long tempoEmMs = System.currentTimeMillis() ; 
	GregorianCalendar today = new GregorianCalendar(); 
	GregorianCalendar cup = new GregorianCalendar(2014,5,12,0,0);
	long thisTimeInMs = cup.getTimeInMillis();
	long daysLeft = ((thisTimeInMs - tempoEmMs) / 86400000);
	int hoursLeft = (24 - today.get(GregorianCalendar.HOUR_OF_DAY));
	int minutesLeft = (60 - today.get(GregorianCalendar.MINUTE));
	int secondsLeft = (60 - today.get(GregorianCalendar.SECOND));
	String teste = ("Missing:" + daysLeft + " Days " + hoursLeft + " Hours " + minutesLeft + " Minutes " + secondsLeft + " Seconds");
 
 
	          System.out.println(teste);
 
	      }
	  };
	  new Timer(delay, taskPerformer).start();
	  JLabel label = new JLabel("Image and Text",
								JLabel.CENTER);
 
	JFrame frame = new JFrame("Teste");
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.getContentPane().add(label);
	label.setText(teste); 
	frame.pack();
	frame.setVisible(true);
	}
 
}

Line 36 - teste cannot be resolved to a variable.

**Norm** · April 27th, 2014, 04:33 PM

The variable: teste is out of scope where the error happens. It's defined inside a method and is not defined where the code tries to use it. Move the setText statement into the method where teste is defined.

**Kerooker** · April 27th, 2014, 05:24 PM

I can't, in that way label won't be resolved to a variable. (it's defined in other method...)

@@Edit

I tried putting all the JPane inside the main method, but that won't work either (no error code, just not working.)

**Norm** · April 27th, 2014, 05:39 PM

Post the code and the full text of the error messages.

**Kerooker** · April 27th, 2014, 05:47 PM

package cupTimer;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.GregorianCalendar;
import javax.swing.* ;
 
public class myTimer {
 
	public static void main(String[] args) throws InterruptedException {
		int delay = 1000; //milliseconds
		  ActionListener taskPerformer = new ActionListener() {
		      public void actionPerformed(ActionEvent evt) {
	long tempoEmMs = System.currentTimeMillis() ; 
	GregorianCalendar today = new GregorianCalendar(); 
	GregorianCalendar cup = new GregorianCalendar(2014,5,12,0,0);
	long thisTimeInMs = cup.getTimeInMillis();
	long daysLeft = ((thisTimeInMs - tempoEmMs) / 86400000);
	int hoursLeft = (24 - today.get(GregorianCalendar.HOUR_OF_DAY));
	int minutesLeft = (60 - today.get(GregorianCalendar.MINUTE));
	int secondsLeft = (60 - today.get(GregorianCalendar.SECOND));
	String teste = ("Missing:" + daysLeft + " Days " + hoursLeft + " Hours " + minutesLeft + " Minutes " + secondsLeft + " Seconds");
System.out.println(teste);
 
	      }
	  };
	  new Timer(delay, taskPerformer).start();
	  JLabel label = new JLabel("Text", JLabel.CENTER);
	  label.setText(teste); 
 
	JFrame frame = new JFrame("Teste");
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.getContentPane().add(label);
	frame.pack();
	frame.setVisible(true);
	}
 
}

label.setText(teste); - Teste cannot be resolved to a variable

I didn't find a way to call the text in another method...

**Norm** · April 27th, 2014, 05:54 PM

label.setText(teste); - Teste cannot be resolved to a variable

The spelling is wrong. The variable is named: teste, not Teste

**Kerooker** · April 27th, 2014, 06:13 PM

No, the two calls are with the same name. The variable is named 'teste', and I tried to call 'teste', just copied the wrong name from the error, sorry.

**Norm** · April 27th, 2014, 06:35 PM

The setText() call must be in the same scope with where teste is defined.

**Kerooker** · April 27th, 2014, 06:39 PM

I tried doing it:

package cupTimer;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.GregorianCalendar;
import javax.swing.* ;
 
public class myTimer {
 
	public static void main(String[] args) throws InterruptedException {
		int delay = 1000; //milliseconds
		  ActionListener taskPerformer = new ActionListener() {
		      public void actionPerformed(ActionEvent evt) {
	long tempoEmMs = System.currentTimeMillis() ; 
	GregorianCalendar today = new GregorianCalendar(); 
	GregorianCalendar cup = new GregorianCalendar(2014,5,12,0,0);
	long thisTimeInMs = cup.getTimeInMillis();
	long daysLeft = ((thisTimeInMs - tempoEmMs) / 86400000);
	int hoursLeft = (24 - today.get(GregorianCalendar.HOUR_OF_DAY));
	int minutesLeft = (60 - today.get(GregorianCalendar.MINUTE));
	int secondsLeft = (60 - today.get(GregorianCalendar.SECOND));
	String teste = ("Missing:" + daysLeft + " Days " + hoursLeft + " Hours " + minutesLeft + " Minutes " + secondsLeft + " Seconds");
System.out.println(teste);
	label.setText(teste); 
 
	      }
	  };
	  new Timer(delay, taskPerformer).start();
	  JLabel label = new JLabel("Text", JLabel.CENTER);
 
 
	JFrame frame = new JFrame("Teste");
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.getContentPane().add(label);
	frame.pack();
	frame.setVisible(true);
	}
 
}

But then, "label cannot be resolved".

**Norm** · April 27th, 2014, 06:42 PM

"label cannot be resolved".

Post the full text showing the statement where the error happened and line number.

**Kerooker** · April 27th, 2014, 06:47 PM

label cannot be resolved - line 24

**Norm** · April 27th, 2014, 06:50 PM

What statement is on line 24?

**Kerooker** · April 27th, 2014, 06:53 PM

label.setText(teste);

**Norm** · April 27th, 2014, 06:59 PM

label needs to be defined BEFORE it is used. Move its definition ahead of where it is used.

**Kerooker** · April 27th, 2014, 07:10 PM

It's not possible, or else I would need to cal the label after the main method ended, and it's not possible to declare the Jframe before the timer...

I need a way to use a variable from the main mathod in the JFrame method.

**Norm** · April 27th, 2014, 07:11 PM

it's not possible to declare the Jframe before the timer.

Please explain and post the error messages

**Kerooker** · April 27th, 2014, 07:19 PM

I tried this

package cupTimer;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.GregorianCalendar;
import javax.swing.* ;
 
public class myTimer {
 
	public static void main(String[] args) throws InterruptedException {
		int delay = 1000; //milliseconds
		  ActionListener taskPerformer = new ActionListener() {
		      public void actionPerformed(ActionEvent evt) {
	long tempoEmMs = System.currentTimeMillis() ; 
	GregorianCalendar today = new GregorianCalendar(); 
	GregorianCalendar cup = new GregorianCalendar(2014,5,12,0,0);
	long thisTimeInMs = cup.getTimeInMillis();
	long daysLeft = ((thisTimeInMs - tempoEmMs) / 86400000);
	int hoursLeft = (24 - today.get(GregorianCalendar.HOUR_OF_DAY));
	int minutesLeft = (60 - today.get(GregorianCalendar.MINUTE));
	int secondsLeft = (60 - today.get(GregorianCalendar.SECOND));
	String teste = ("Missing:" + daysLeft + " Days " + hoursLeft + " Hours " + minutesLeft + " Minutes " + secondsLeft + " Seconds");
	System.out.println(teste);
	JLabel label = new JLabel (teste, JLabel.CENTER);
 
	JFrame frame = new JFrame("Teste");
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.getContentPane().add(label);
	frame.pack();
	frame.setVisible(true);
	      }
	  };
	  new Timer(delay, taskPerformer).start();
 
	}
 
}

But it didn't work, without any errors, it just terminate the program without anything in the console.

I tried putting the JFrame inside the main method.

**Norm** · April 27th, 2014, 07:24 PM

it didn't work, without any errors,

Post the full text of the error messages if you need help with them.

The actionPerformed() method is called once a second. Do you want a new frame created once a second?

**Kerooker** · April 27th, 2014, 07:26 PM

No error message, just not working.

I want the frame to be updated every second with the new information, so it can be counted down second to second.

**Norm** · April 27th, 2014, 07:40 PM

I want the frame to be updated every second

Updating an existing frame is different from creating a new frame every second.

You are now back to the problem discussed in post#24 - Thread sleep

**Kerooker** · April 27th, 2014, 07:43 PM

But if I leave the frame out of the timer method, I cannot call the values in the main method, as they're in different methods

Should I put the frame before the rest?

**Norm** · April 27th, 2014, 07:44 PM

yes

**Kerooker** · April 27th, 2014, 07:50 PM

package cupTimer;
 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.GregorianCalendar;
import javax.swing.* ;
 
public class myTimer {
	public static void main(String[] args) throws InterruptedException {
		    JLabel label = new JLabel("Text", JLabel.CENTER);
			JFrame frame = new JFrame("Teste");
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.getContentPane().add(label);
			frame.pack();
			frame.setVisible(true);
		int delay = 1000; //milliseconds
		  ActionListener taskPerformer = new ActionListener() {
		      public void actionPerformed(ActionEvent evt) {
	long tempoEmMs = System.currentTimeMillis() ; 
	GregorianCalendar today = new GregorianCalendar(); 
	GregorianCalendar cup = new GregorianCalendar(2014,5,12,0,0);
	long thisTimeInMs = cup.getTimeInMillis();
	long daysLeft = ((thisTimeInMs - tempoEmMs) / 86400000);
	int hoursLeft = (24 - today.get(GregorianCalendar.HOUR_OF_DAY));
	int minutesLeft = (60 - today.get(GregorianCalendar.MINUTE));
	int secondsLeft = (60 - today.get(GregorianCalendar.SECOND));
	String teste = ("Missing:" + daysLeft + " Days " + hoursLeft + " Hours " + minutesLeft + " Minutes " + secondsLeft + " Seconds");
	System.out.println(teste);
	label.setText(teste);
 
	      }
	  };
	  new Timer(delay, taskPerformer).start();
 
	}
 
}

Error at label.setText(teste);
Cannot refer to a non-final variable label inside an inner class defined in a different method

**Norm** · April 27th, 2014, 07:53 PM

Cannot refer to a non-final variable

Make it final

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