java - Array allocation -

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• use of array of 0 length 3 answers

i confused mean ::

int[] array = new int[0]; 

how many bytes allocated here? or nothing allocated in memory? going underneath?

this zero-length array.

how many bytes allocated platform specific, still have array here, short one. in general, array in java needs

fixed overhead + length * componentsize  

bytes (and there maybe padding).

also note since arrays cannot resized in java, , zero-length array cannot have elements updated, makes immutable , don't need more 1 instance of them in whole program, can use static singleton arrayutils.empty_int_array, saving "fixed overhead".