As I was going through differences between vector<T> & ArrayList<T> in that section I had gone through that You can specify how a Vector<T> object should increase its capacity when it is necessary whereas with an ArrayList<T> you cannot. You can have some control over how an ArrayList<T> increases in capacity by using its ensureCapacity() method that sets a given capacity and another thing You can discover the current capacity of a Vector<T> by calling its capacity() method. You have no way to know the current capacity of an ArrayList<T> unless you have set its capacity explicitly...!! Please guys can You help me improving this with a shortr example..!!
Well why would you even want to know what the capacity is in the first place? It's an implementation detail that makes the list work reasonably fast, and beyond the ensureCapacity() method not very interesting. They did well hiding this stuff from the client.
And Vector is pretty much obsolete. Just pretend it's not part of the standard API.