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
     c) {    Object[] a = this.toArray();    Arrays.sort(a, (Comparator) c);    ListIterator
    
      i = this.listIterator();    for (Object e : a) {        i.next();        i.set((E) e);    }}
    

public static 
    
     > Comparator
     
       naturalOrder() {    return (Comparator
      
       ) Comparators.NaturalOrderComparator.INSTANCE;}
      
     
    

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