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

It will depend on the implementation, but from the Sun Java 6 source code:

int newCapacity = (oldCapacity * 3)/2 + 1;

That's in the ensureCapacity method. Other JDK implementations may vary.