Java9中对集合类扩展的of方法解析

package com.jd.collections;
import org.junit.Test;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class StreamTest {
    @Test
    public void testSet() {
        Set<Integer> integerSet = Set.of(1, 2, 3, 4, 5, 6, 7, 8);
        System.out.println(integerSet);
    }
    @Test
    public void testList() {
        List<Integer> integerSet = List.of(1, 2, 3, 4, 5, 6, 7, 8);
        System.out.println(integerSet);
    }
    @Test
    public void testMap() {
        Map<String, String> stringMap = Map.of("k1", "v1", "k2", "v2", "k3", "v3");
        System.out.println(stringMap);
        Map.Entry<String, String> entry1 = Map.entry("k1", "v1");
        Map.Entry<String, String> entry2 = Map.entry("k11", "v11");
        Map.Entry<String, String> entry3 = Map.entry("k12", "v12");
        Map<String, String> mapOfEntries = Map.ofEntries(entry1, entry2, entry3);
        System.out.println(mapOfEntries);
    }
    @Test
    public void testStream1() {
        Optional<Integer> integerOptional = Stream.ofNullable(Integer.valueOf("1232")).findAny();
        System.out.println(integerOptional.get());
    }
    @Test
    public void testStream2() {
        Stream.of(1, 2, 3, 4, 5, 6).dropWhile(x -> x == 6).forEach(System.out::println);
    }
    @Test
    public void testStream3() {
        IntStream.of(1, 2, 3, 4, 5, 6).forEach(System.out::println);
    }
    @Test
    public void testStream4() {
        IntStream.iterate(1, i -> i < 10, i -> i + 2).forEach(System.out::println);
    }
//    @Test
//    public void testFlow() {
//        Flow.Processor
//    }
}