两种获取stream的方式

两种获取stream的方式

package com.mujiachao.stream;

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

/**
 * 转换成stream流的两种方法
 */
public class Demo3 {
    public static void main(String[] args) {
        /**
         * 第一种
         */
        ArrayList<Object> list = new ArrayList<>();
        Stream<Object> stream = list.stream();

        HashSet<Object> objects = new HashSet<>();
        Stream<Object> stream1 = objects.stream();

        HashMap<Object, Object> objectObjectHashMap = new HashMap<>();
        Set<Object> objects1 = objectObjectHashMap.keySet();
        Stream<Object> stream2 = objects1.stream();

        Collection<Object> values = objectObjectHashMap.values();
        Stream<Object> stream3 = values.stream();

        Set<Map.Entry<Object, Object>> entries = objectObjectHashMap.entrySet();
        Stream<Map.Entry<Object, Object>> stream4 = entries.stream();
        /**
         * 第二种
         */
        Stream<Integer> integerStream = Stream.of(1, 2, 5, 4, 6, 5, 4, 8, 7);
        
        Integer[] arr={4,5,8,7,9,5,46,4};
        Stream<Integer> arr1 = Stream.of(arr);

    }
}