default size of vector and arraylist

[yash Vi]

I know the basic difference that vector is synchronised and arraylist is not.There is some difference in the default size and the way it expand itself when it becomes full.can someone help me understand the same

[Ernest Friedman-Hill]

They do use a different algorithm for growing the array. Vector uses the classic multiply-by-two algorithm -- every time the array grows, it doubles in size. From a theoretical standpoint, this has near-optimal performance -- but it uses too much memory. I believe ArrayList uses a more moderate grow-by-50% rule; the performance in real applications is basically the same, and it uses less memory.

[yash Vi]

Thanks for the update.wot is the size when it is initially created using their default constructor

[Stuart Gray]

According to the source it is 10 in both cases.