Returns the size of the specified collection or {@code 0} if the collection is {@code null}.
@param c the collection to check @return the size of the specified collection or {@code 0} if the collection is {@code null}.
See Implementation
Returns the size of the specified collection or {@code 0} if the collection is {@code null}.
@param c the collection to check @return the size of the specified collection or {@code 0} if the collection is {@code null}.