博客

List    转为    Stream

List<String> list = new ArrayList<>();

Stream<String> stream = list.stream();

set    转为    Stream

Set<String> set = new HashSet<>();

Stream<String> stream1 = set.stream();

Map    转为    Stream

Map<String, Integer> map = new HashMap<>();

Set<Map.Entry<String, Integer>> entrySet = map.entrySet();

Stream<Map.Entry<String, Integer>> stream2 = entrySet.stream();

数组    转为    Stream

String[] arr = new String[3];

Stream<String> arr1 = Stream.of(arr);

Integer[] arr2 = new Integer[3];

Stream<Integer> arr21 = Stream.of(arr2);