Question

i have some pb. I want to cast a List to Collection in java

Collection<T> collection = new Collection<T>(mylList); 

but i have this error

Can not instantiate the type Collection

Answer 1

List<T> already implements Collection<T> – why would you need to create a new one?

Collection<T> collection = myList;

The error message is absolutely right – you can’t directly instantiate an interface. If you want to create a copy of the existing list, you could use something like:

Collection<T> collection = new ArrayList<T>(myList);