Java - Including array declaration inside function call?

Question

I am trying to declare an int array in the call of a method, is this possible in Java?

I am relatively new to Java but have some python knowledge. I was trying to find an equivalent of (in python3):

foo([1,2,3,4])  #python

Declaring the array first works ofc:

int[] data = {1,2,3,4,5};
printArray(reverseArray(data));

But I was wondering if something such as:

printArray(reverseArray(int[] {1,2,3,4,5}));

Was possible.

I am working under Netbeans and my above attempted solution is reported as a 'not a statement' error. Also, would:

int[] data = new int[] {1,2,3,4,5}

be more correct than simply:

int[] data = {1,2,3,4,5};

?

Jacob G. · Accepted Answer · 2019-01-09 16:39:02Z

4

You only need to add the new keyword so that it creates a new object:

printArray(reverseArray(new int[] {1,2,3,4,5}));

If you define your reverseArray method to take int... instead of int[], then you can also use the following, which I'd argue is more readable:

printArray(reverseArray(1, 2, 3, 4, 5));

answered Jan 9, 2019 at 16:39

Jacob G.

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2 Comments

Is there also any efficiency difference in using int... and letting the compiler handle the array creation or is that purely syntactic sugar?

I’m pretty sure it’s just sugar, but even if it provided some efficiency benefit, I’d prefer it regardless because of the readability improvement.

Sandeepa · Accepted Answer · 2019-01-09 16:40:22Z

0

Just add the new keyword as below,

printArray(reverseArray(new int[] {1,2,3,4,5}));

answered Jan 9, 2019 at 16:40

Sandeepa

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