- java.util.stream.Stream<T> 是Java 8 新加入的最常用的流接口。(这并不是一个函数式接口)
- 获取一个流有以下两种方式
- 所有的 Collection集合 都可以通过stream默认方法获取流
- Stream接口 的静态方法of可以获取数组对应的流
package com.csdn.stream; import java.util.*; import java.util.stream.Stream; public class Demo02GetStream {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,存储到一个Set集合中Set<String> keySet = map.keySet();Stream<String> stream3 = keySet.stream();//获取值,存储到一个Collection集合中Collection<String> values = map.values();Stream<String> stream4 = values.stream();//获取键值对(键与值的映射关系 entrySet)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);//可变参数可以传递数组Integer[] arr = {1, 2, 3, 4, 5};Stream<Integer> stream7 = Stream.of(arr);String[] arr2 = {"a", "bb", "ccc"};Stream<String> stream8 = Stream.of(arr2);} }