How many heap space takes array object? I mean not a array reference. For example how many heap space will take this array
Integer[] array = new Integer[5];
Or perhaps you know some ways how I can to test memory usage of my application? Any suggestions and advices will be appreciated)
Thanks in advance!
It depends if the array is of primitive type of object types. If it is int[] = new int[5] it will be 5 times int memory size - 5x4=20 bytes.
If it is Object and not primitive like in your case (Integer) then the memory used is the number of the object multiplied by reference memory size ( the pointer size ) - 32 bits or 64 bits depending on the JVM.
I believe you mean:
Integer[] array = new Integer[5];
And integers are 4 bytes when being used... so 4*5= 20 bytes. But there is more to it than just this.. Certain overhead on the array's in such and the fact you are using the Integer class rather than just doing:
int[] array = new int[5];
I would suggest trying to google for a more explained answer or go here: Calculating Java Array Memory Usuage
