ReversibleCollection proposal

[Peter Levart]

On 4/18/21 9:51 AM, Peter Levart wrote:
> public interface Collection<E> .... {
>         default Collection<E> reversed() { return this; }
>         default void addFirst(E e) { throw new 
> UnsupportedOperationException(); }
>         default void addLast(E e) { throw new 
> UnsupportedOperationException(); }


For unordered collections this could as well be:


         default void addFirst(E e) { return add(e); }
         default void addLast(E e) { return add(e); }


As the iteration of such modified unordered collection would not 
guarantee any order. SortedSet would of course override them with 
throwing methods.


> default E getFirst() { return iterator().next(); }
>         default E getLast() { return iterator().next(); }
>         default E removeFirst() { var i = iterator(); i.next(); 
> i.remove(); }
>         default E removeLast() { var i = iterator(); i.next(); 
> i.remove(); }
> }