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How to get the Object size at runtime ?

Posted on 2009-07-14
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Last Modified: 2012-05-07
We want to find out Object size at runtime
But
Do not want to use Reflection, because it adds performance issue.
Do not want to use the conventional method of calculating an Object by the no. of Primitive data it holds.

Is there any other way, i can get the Object size but that does not add any performance issue.
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Question by:manojatinfy
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5 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 24847528
There's certainly no overhead-free way of doing it. Just check memory usage via Runtime before and after creation
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LVL 23

Expert Comment

by:Ajay-Singh
ID: 24847545
You can't get the size of the object at runtime in java. You
can only guess, which I don't think you are asking.
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LVL 20

Expert Comment

by:a_b
ID: 24847602
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LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 24847692
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Author Comment

by:manojatinfy
ID: 24901941
Dear Objects,
While running the sizeOf program, we are getting following error.
Exception in thread "main" java.lang.IllegalStateException: Instrumentation is null
      at net.sourceforge.sizeof.SizeOf.sizeOf(SizeOf.java:59)
Kindly suggest, if there are any inputs required.
Can you please share the Help text to run this program.
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