Iterable
package java.lang;import java.util.Iterator; import java.util.Objects; import java.util.Spliterator; import java.util.Spliterators; import java.util.function.Consumer; public interface Iterable<T> {Iterator<T> iterator();default void forEach(Consumer<? super T> action) {Objects.requireNonNull(action);for (T t : this) {action.accept(t);}}default Spliterator<T> spliterator() {return Spliterators.spliteratorUnknownSize(iterator(), 0);} }
Iterator
package java.util;import java.util.function.Consumer;public interface Iterator<E> {boolean hasNext();E next();default void remove() {throw new UnsupportedOperationException("remove");}default void forEachRemaining(Consumer<? super E> action) {Objects.requireNonNull(action);while (hasNext())action.accept(next());}
}