[alex3305]

> It's really a tricky balance. Over-allocating collections "just in case" can quite often be very expensive as well

It is sometimes really tricky. When I worked with streaming XML documents that were gigabytes in size, there is a really fine margin you have to work with.

However some general knowledge can be pretty useful. I saw colleagues just do "= new ArrayList<?>(1000);" without considering the collection type or possible size. And besides being a bit ignorant, it can also be really confusing for other developers that take first look at such code.