ArrayList: how does the size increase?

Question

I have a basic question on Java ArrayList.

When ArrayList is declared and initialized using the default constructor, memory space for 10 el

Answer 1

Up to JDK 6 the the capacity grow with formula newCapacity = (oldCapacity * 3/2) + 1.

In JDK 7 and above the formula changes to newCapacity = oldCapacity + (oldCapacity >> 1).

So if initial capacity is 10 then new capacity will be 16 in JDK6 and 15 in above JDK7