java中将集合数组转换为Stream流

import java.util.*;
import java.util.stream.Stream;
 
public class demo_list_set_map_stream {
    public static void main(String[] args) {
//        list集合转Stream
        List<String> list=new ArrayList<>();
        Stream<String> list_stream = list.stream();
//        Set集合转Stream
        Set<String> set=new HashSet<>();
        Stream<String> set_stream = set.stream();
//        Map集合转Stream
        Map<String,String> map=new HashMap<>();
        Stream<String> hm_set_stream = map.keySet().stream();
        Stream<String> hm_val_stream = map.values().stream();
        Stream<Map.Entry<String, String>> hm_en_stream = map.entrySet().stream();
 
//        数组转换为Stream
        Stream<Integer> integerStream = Stream.of(1, 2, 3, 4, 5, 6, 7);
        Stream<String> str_stream = Stream.of("abc", "abcd", "abcde");
 
    }
}