How can I initialize an ArrayList with all zeroes in Java?

Question

It looks like arraylist is not doing its job for presizing:

// presizing 

ArrayList list = new ArrayList(60);
         


        

Answer 1

The 60 you're passing is just the initial capacity for internal storage. It's a hint on how big you think it might be, yet of course it's not limited by that. If you need to preset values you'll have to set them yourself, e.g.:

for (int i = 0; i < 60; i++) {
    list.add(0);
}