Creating an int array filed with zeros in Java

Question

I want to create a 10 dimensional array that's filled with zeros. If I simply use int[] array = new int[10]; do I have a guarantee that all int's in the array are zeros?

A 10 dimensional array : int[][][][][][][][][][] array; is not the same thing as a 1 dimensional array with 10 elements : new int[10]. — Ishtar
– Ishtar, Commented Mar 22, 2011 at 12:53
In his defense you could represent a 10 dimensional vector with 10 elements. Granted the terminology is off but the spirit of the question is clear. — Andrew White
– Andrew White, Commented Mar 22, 2011 at 12:59

Kerem Baydoğan · Accepted Answer · 2011-03-22 12:57:36Z

56

int always has initial value of 0. so

new int[10]

is enough.

for other values use Arrays utility class.

   int arrayDefaultedToTen[] = new int[100]; 

   Arrays.fill(arrayDefaultedToTen, 10);

this method fills the array (first arg) with 10 (second arg).

answered Mar 22, 2011 at 12:57

Kerem Baydoğan

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Comments

Vance Maverick · Accepted Answer · 2011-03-22 12:47:44Z

3

Yes, but it's only one-dimensional, not ten.

answered Mar 22, 2011 at 12:47

Vance Maverick

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3 Comments

Michael Borgwardt Over a year ago

And a ten-dimensional array of size 10 in all dimensions would require 37GB of memory, if I calculated correctly.

Peter Lawrey Over a year ago

I calculate 10^9 * (8 (reference to) + 16 (array header) + 10*4) which is ~ 60 GB. ;)

Andrew White Over a year ago

Orrrrr... it's a ten-dimensional array that can hold 32 enumerable states :)

Andrew White · Accepted Answer · 2011-03-22 12:48:52Z

2

Doing a new int[10] will be plenty. Refer to the authority for the default values.

answered Mar 22, 2011 at 12:48

Andrew White

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2 Comments

Stephen C Over a year ago

The REAL authority is JLS 15.10.1 (paragraph 5).

Andrew White Over a year ago

I looked but couldn't find a link very quickly and figured Oracle was enough of an authority; thanks for the spec though

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