java problems tips
How to view variable occupies memory size
I want to see the variable occupies memory size,
ask the following code have any questions, print out the result is 0?
; final int NMAX = 10;
long mem1 = Runtime.getRuntime (). freeMemory ();
System.out.println ("Free Memeory ; 1: "+ mem1);
/ / allocate the ; triangle array
int   odds = new int [NMAX] ;
; for (int i = 0; i <NMAX; i + +)
odds [i] = new int [i +1];
long mem2 = Runtime.getRuntime (). freeMemory ();
; System.out.println ("Free Memeory 2:" + mem2);
; long uMem = mem1 - mem2;
System.out.println ("Used memory:" + uMem);
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