Java9 中对集合类扩展的 of 方法

Java9 中对集合类扩展的 of 方法

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)/*.takeWhile(x -> x == 2)*/.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//    }}