Question

If I want to instantiate a LinkedList and require access to the methods in both List and Dequeue interfaces, and do not want to type to the concrete implementation, and do not want to cast between interfaces, is there a way?

i.e.:

LinkedList ll = new LinkedList(); // don't want to do this...


List ll = new LinkedList();
ll.peekFirst(); // can't access peekFirst method
((DeQueue) ll).peekFirst(); // Kinda ugly

Answer 1

public interface Foo<T> extends List<T>, Deque<T>{}

public class Bar<T> extends LinkedList<T> implements Foo<T>{}

Foo ll = new Bar();

Don’t have eclipse near me, this should compile though.