Lambda create stream

Single column set ： A collection of objects .stream()

        List<Author> authors = getAuthors();
		Stream<Author> stream = authors.stream();

Array ：Arrays.stream( Array ) Or use Stream.of To create

        Integer[] arr = {1,2,3,4,5};
        Stream<Integer> stream = Arrays.stream(arr);
        Stream<Integer> stream2 = Stream.of(arr);

Double column set ： Convert to a single column set and then create

        Map<String,Integer> map = new HashMap<>();
        map.put(" Crayon Shin Chan ",19);
        map.put(" The spots ",17);
        map.put(" The sun shines on the sun ",16);

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