Stream流

 1 public static void main(String[] args) {
 2         //  Collection 集合获取 流
 3         Collection<String> collection = new ArrayList<>();
 4         Stream<String> stream = collection.stream();
 5 
 6         //  Map 集合获取 流
 7         Map<String, Integer> map = new HashMap<>();
 8         //  获取 键 流
 9         Stream<String> key = map.keySet().stream();
10         //  获取 值 流
11         Stream<Integer> value = map.values().stream();
12         //  获取 键值对 流
13         Stream<Map.Entry<String, Integer>> keyVal = map.entrySet().stream();
14 
15         //  数组获取 流
16         String[] names = {"张三", "李四", "王武"};
17         Stream<String> list1 = Arrays.stream(names);
18 
19         Stream<String> list2 = Stream.of(names);
20     }