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Index › Programming Questions & Help › Syntax Questions › Instantiation of a Java Class Library
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Instantiation of a Java Class Library (Read 692 times)
knutl
Instantiation of a Java Class Library
Mar 6th, 2010, 4:19am  
I work with the SimpleARToolKit and thats just fine.

But now as I get more experienced I would like to use some functions from the underlying JARToolKit.
But I fail already at the very beginning: I cannot instantiate the JARToolKit.

Documentations says:
public static JARToolKit create()
                        throws java.lang.InstantiationException

Here is what I tried:

import net.sourceforge.jartoolkit.core.*;
JARToolKit jk;
try {
  jk=JARToolKit.create();
}
catch (InstantiationException e){
 println("some problem");
}

jk.utilTimerReset(); //this is a very simple JARToolKit function
//Processing tells me in this line: The local variable jk may not been initialized.

I assume, thats a very basic problem but I its quite hard for me to find the answer.
Thnx for any help.
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koogy
Re: Instantiation of a Java Class Library
Reply #1 - Mar 6th, 2010, 5:51am  
> //Processing tells me in this line: The local variable jk may not been initialized.

JARToolKit jk = null;

and put a null check around the jk.utilTimerReset(); (or move the whole of your code into the try block so it'll catch any other exceptions in the code. oh, and use println(e) and e.printStackTrace() in the catch - you're just silencing the exception otherwise and it contains useful information that you're just ignoring.)
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knutl
Re: Instantiation of a Java Class Library
Reply #2 - Mar 6th, 2010, 6:11am  
Ok great. It just works.
I will now try to understand WHY.
Thnx for the advices also. I will do my best:)
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