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If I use a statement in my code like
int[] a = new int[42];
Will it initialize the array to anything in particular? (e.g. 0) I seem to remember this is documented somewhere but I am not sure what to search for.
724
To provide initial object references or primitive values other than the default, you have to address each element in the array. In the following code, we declare and create an array of Rectangle objects, and then create the Rectangle objects for each element: 1. Rectangle hotSpots[] = new Rectangle[10]; 2.
In Java, all array elements are automatically initialized to the default value.
An array may be partially initialized, by providing fewer data items than the size of the array. The remaining array elements will be automatically initialized to zero. If an array is to be completely initialized, the dimension of the array is not required.
Can array of primitive data type be instantiated? Yes.
At 15.10 Array Creation Expressions the JLS says
[...] a single-dimensional array is created of the specified length, and each component of the array is initialized to its default value
and at 4.12.5 Initial Values of Variables it says:
For type
int, the default value is zero, that is,0.
144
When created, arrays are automatically initialized with the default value of their type - in your case that would be 0. The default is false for boolean and null for all reference types.
28
The array would be initialized with 42 0s
For other data types it would be initialized with the default value ie.
new boolean[42]; // would have 42 falses
new double[42]; // would have 42 0.0 ( or 0.0D )
new float[42]; // 42 0.0fs
new long[42]; // 42 0Ls
And so on.
For objects in general it would be null:
String [] sa = new String[42]; // 42 nulls
Date [] da = new Date[42]; // 42 nulls
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