what is the correct way to initialize java array with a size and default value

Question

In c++, I can do

vector<int> arr(10, 100); // arr with Size 10 and default value 100.

Is there a similar way (one-liner) to initialize java array with a size and default value?

That's not an array, that's a collection. Do you want a Java array or a Java Collection? and if the latter, which one? `ArrayList`? — user207421, Jul 15 '19 at 04:49
If you want to initialize an `ArrayList`: `new ArrayList<>(Collections.nCopies(10, 100))`. — Andy Turner, Jul 15 '19 at 06:35

score 1 · Answer 1 · edited Jul 15 '19 at 05:32

1

There is no built-in function. In Java, arrays are always initialized with 0 or false or null, according to type.

You can import java.util.Arrays; and then do:

int[] arr = new int[10];
Arrays.fill(arr, 100);

edited Jul 15 '19 at 05:32

user207421

answered Jul 15 '19 at 04:51

Dorian Gray

If you fill in this way, It will add 100 as default for all the values. Like this [100, 100, 100, 100, 100, 100, 100, 100, 100,100] – Nishantha Bulumulla Jul 15 '19 at 05:02
`int[] arr = IntStream.generate(() -> 100).limit(10).toArray();` – Elliott Frisch Jul 15 '19 at 05:03
He didn't ask about a built-in function, and there is `int[] array = {1,2,3,4,5,6,7,8,9,10};`. – user207421 Jul 15 '19 at 05:33
I was actually asking a built-in function in c++ style. – derek Jul 15 '19 at 06:42
@Nishantha Bulumulla: yes, that is what `vector arr(10, 100);` does in C. He didn't ask for ascending values. – Dorian Gray Jul 15 '19 at 18:56
@derek No, you didn't ask for that. – Dorian Gray Jul 15 '19 at 18:57

1 Answers1