What are Collection related features in Java 8?

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Java 8 has brought major changes in the Collection API. Some of the changes are:

1.Java Stream API for collection classes for supporting sequential as well as parallel processing

Collection.java 接口新增如下方法default Stream<E> stream() {return StreamSupport.stream(spliterator(), false);}default Stream<E> parallelStream() {return StreamSupport.stream(spliterator(), true);}

2.Iterable interface is extended with forEach() default method that we can use to iterate over a collection. It is very helpful when used with lambda expressions because it’s argument Consumer is a function interface.

Iterable接口新增如下方法
default void forEach(Consumer<? super T> action) {Objects.requireNonNull(action);for (T t : this) {action.accept(t);}}

3.Miscellaneous Collection API improvements such as forEachRemaining(Consumer action) method in Iterator interface, Map replaceAll(), compute(), merge() methods.

Iterator 迭代器通过 forEachRemaining()方法实现增强for循环.

public static void test(List<String> list) {list.iterator().forEachRemaining(str->{System.out.println(str);});
}

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