Java Stream流

一、获取Stream流二、Stream流常用API

import java.util.*;

public class StreamDemo02 {
    public static void main(String[] args) {
        
        Collection list = new ArrayList<>();
        Stream s =  list.stream();

        
        Map maps = new HashMap<>();
        // 键流
        Stream keyStream = maps.keySet().stream();
        // 值流
        Stream valueStream = maps.values().stream();
        // 键值对流（拿整体）
        Stream> keyAndValueStream =  maps.entrySet().stream();

        
        String[] names = {"赵敏","小昭","灭绝","周芷若"};
        Stream nameStream = Arrays.stream(names);
        Stream nameStream2 = Stream.of(names);
    }
}

Stream sorted(Comparator comparator)//排序
Stream limit(long maxSize)//最多返回的元素个数
void forEach(Consumer action)//遍历
Stream filter(Predicate predicate)//过滤器
long count()//返回元素个数
Stream skip(long n)//跳过前几个
 Stream map(Function mapper)//加工方法
static  Stream concat(Stream a, Stream b)//合并方法