Any shortcut to initialize all array elements to zero?

Monday, May 7, 2012

In C/C++ I used to do




int arr[10] = {0};

to initialize all my array elements to 0.

Is there a similar shortcut in Java?

I want to avoid using the loop, is it possible?




int arr[] = new int[10];

for(int i=0;i<arr.length;i++)

    arr[i] = 0;

UserMay 7, 2012 at 6:48 PM
A default value of 0 for arrays of integral types is guaranteed by the language spec:

Each class variable, instance
variable, or array component is
initialized with a default value when
it is created (§15.9, §15.10) [...] For type int, the default value is zero, that is, 0.

If you want to initialize an array to a different value, you can use java.util.Arrays.fill() (which will of course use a loop internally).
ReplyDelete
Replies
UserMay 7, 2012 at 6:48 PM
In java all elements are initialised to 0 by default. You can save the loop.
ReplyDelete
Replies
UserMay 7, 2012 at 6:48 PM
You can save the loop, initialization is already made to 0. Even for a local variable.

But please correct the place where you place the brackets, for readability (recognized best-practice):

int[] arr = new int[10];
ReplyDelete
Replies