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close java class

Posted on 2004-03-26
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Last Modified: 2010-03-31
i want to know how to close a java class?

e.g.
MyClass newClass = new MyClass();

how to close the above class?

When the class will be close if java cannot close it?

thanks
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Question by:Kennywen
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13 Comments
 
LVL 16

Expert Comment

by:krakatoa
ID: 10685410
public class Main {
    public static void main(String[] args) {

new Main();
         
    }
}


This is the simplest class you can have almost. It will just be loaded and end.

If its a thread,. it will end when run() is finished.
0
 

Author Comment

by:Kennywen
ID: 10685438
that mean i will end by itself?? is there any way for us to end the new operator?
0
 
LVL 16

Expert Comment

by:krakatoa
ID: 10685457
Not quite sure I follow what you mean by end the new operator. Objects in Java - and that means just about everything, cease to exist when they are not referenced by anythin else, so when they go out of  scope, they die.
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LVL 37

Accepted Solution

by:
zzynx earned 75 total points
ID: 10685489
I guess you mean how to be sure the created instance of a class is removed from memory.

Well, that's the work of Java's garbage collector (GC)
Whenever an object is no longer referenced, it's a *candidate* to be removed from memory.
This doesn't mean it is removed. But that up to the GC to decide.

The only thing *you* have to take care of (to avoid memory leaks) is:
make sure that all references to an object you don't need no longer are gone.
0
 
LVL 16

Expert Comment

by:krakatoa
ID: 10685549
In languages such as C++ there aer *de*structors, which are the opposite of constructors. In Java, you dont need that, because when an object is no longer pointed to (referenced) by any other object, then it is removed from memory by the garbage collector - System.gc() - automatically.
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LVL 30

Assisted Solution

by:Mayank S
Mayank S earned 75 total points
ID: 10685609
>> MyClass newClass = new MyClass();
>> how to close the above class?

You can set: newClass = null ;

- the MyClass object allocated by the new operator now becomes a candidate for garbage-collection (as long as there are no more references to it). The JVM will soon garbage-collect it (you cannot force it).
0
 
LVL 37

Expert Comment

by:zzynx
ID: 10685620
Now, *you* are "repeating" *me*. Aren't you? ;)
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10685631
Just added the extra line of code ;-)
0
 
LVL 37

Expert Comment

by:zzynx
ID: 10685664
>> Just added the extra line of code ;-)

mayankeagle, in fact I was talking to krakatoa :)
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10685714
Oh.... I thought the "candidate for garbage-collection ". Anyways ;-)
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10720795
Why a B :-(
0
 
LVL 37

Expert Comment

by:zzynx
ID: 10721396
Yeah, I also wonder...
Sometimes people think that the grades relate for the difficulty of the question.
But that isn't the case. If the answer is good an to the point it deserves an A.

Anyway, thanks for accepting.
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10721433
Yeah, it also makes no difference to the questioner as they only spend as many question-points as they allocated to the question. Some closing help here:

http://www.experts-exchange.com/help/closing.jsp
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