Java 8 创建 Stream 流

package org.onepiece;

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

public class Main {

    /**
     * 创建流
     */
    public static void main(String[] args) {

        //Stream.of 可变参数
        Stream stream1 = Stream.of(1, 2, 3);
        //stream1.forEach(System.out::println);
        stream1.forEach(x -> System.out.print(x + " ")); //1 2 3
        println("");


        //Stream.of 数组
        Integer[] intArray = {4, 5, 6};
        Stream stream2 = Stream.of(intArray);
        stream2.forEach(x -> System.out.print(x + " ")); //4 5 6
        println("");


        //Arrays.stream
        Stream stream3 = Arrays.stream(intArray);
        stream3.forEach(x -> System.out.print(x + " ")); //4 5 6
        println("");


        //List.stream
        List<Integer> intList = new ArrayList<>(Arrays.asList(7, 8, 9));
        Stream stream4 = intList.stream();
        stream4.forEach(x -> System.out.print(x + " ")); //7 8 9 
        println("");


        Stream stream5 = Arrays.asList(10, 11, 12).stream();
        stream5.forEach(x -> System.out.print(x + " ")); //10 11 12
        println("");


        //Set.stream
        Set<Integer> set = new HashSet<>(Arrays.asList(1, 3, 5));
        Stream stream6 = set.stream();
        stream6.forEach(x -> System.out.print(x + " ")); //1 3 5
        println("");


        //Map
        Map<Integer, String> map = new HashMap<>();
        map.put(1, "one");
        map.put(2, "two");
        map.put(3, "three");

        Stream<String> stream7 = map.values().stream();
        stream7.forEach(x -> System.out.print(x + " ")); //one two three
        println("");

    }


    private static void println(Object obj) {
        System.out.println(obj);
    }

}