Capacity of ArrayList [duplicate]

Answer 1

I'm going to buck the trend here...the user has a question albeit with no context. Without context, knowing the capacity is unnecessary as the backing array will grow to accommodate...

You can do the following to know for certain what the capacity is with your ArrayList. The side effect is the backing array will be trimmed to the exact number of elements in the array:

ArrayList list = new ArrayList();
//add a bunch of elements
list.trimToSize();
System.out.println("Capacity = " + list.size());

Enjoy!