两种获取Stream流的方式_js 获取屏幕流默认选择吗

java.util.stream.Stream是jdk8加入的最常用的流接口。

1.所有的Collecton集合都可以通过stream默认读取流
2.stream的接口的静态方法of可以获取相对应的流

package com.wcy.demo1.Stream;

import java.util.*;
import java.util.stream.Stream;

public class demo2Stream {
    public static void main(String[] args) {
        //把集合转换为Stream流
        List<String> list=new ArrayList<>();
        Stream<String> stream1=list.stream();

        Set<String> set=new HashSet<>();
        Stream<String> stream2=set.stream();

        Map<String,String> map=new HashMap<>();
        //获取键，存储到set集合中
        Set<String> keyset=map.keySet();
        Stream<String> stream3=keyset.stream();
        
        //获取值，存储到collection中
        Collection<String> values=map.values();
        Stream<String> stream4 = values.stream();
        
        //获取键值对（键与值得映射关系）
        Set<Map.Entry<String,String>> entries=map.entrySet();
        Stream<Map.Entry<String, String>> stream5 = entries.stream();
        
        //把数组转换为Stream流
        Stream<Integer> stream6 = Stream.of(1, 2, 3, 4, 5);
        //可变参数可传递数组
        Integer[] array={1,2,3,4,5};
        Stream<Integer> stream7=Stream.of(array);
        String[] array2={"a","bb","ccc"};
        Stream<String> stream8=Stream.of(array2);
    }
}

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