java8-interface allow static and default methods

default methods

java8 allows static methods inside interfaces

java8 introduces a new feature called default methods that allows you to provide a default implementation for methods in an interface

 

@SuppressWarnings({"unchecked", "rawtypes"}) default void sort(Comparator<? super E> c) {     Object[] a = this.toArray();     Arrays.sort(a, (Comparator) c);     ListIterator<E> i = this.listIterator();     for (Object e : a) {         i.next();         i.set((E) e);     } }

public static <T extends Comparable<? super T>> Comparator<T> naturalOrder() {     return (Comparator<T>) Comparators.NaturalOrderComparator.INSTANCE; }

default Stream<E> stream() {     return StreamSupport.stream(spliterator(), false); }