Java8 Stream 使用

本文主要是介绍Java8 Stream 使用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

Stream 一般配合List 使用
常见的使用方法和程序运行结果都在下面

private static void test1() {List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);List<Integer> collect = integers.stream().skip(1).collect(Collectors.toList());collect.forEach(System.out::println);//打印信息//2//3//4//5}private static void test2() {List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);List<Integer> collect = integers.stream().filter(integer -> integer > 2).collect(Collectors.toList());collect.stream().forEach(System.out::println);//打印信息//3//4//5}private static void test3() {List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);System.out.println(integers.stream().anyMatch(integer -> integer > 2));//打印信息//true}private static void test4() {List<Integer> integers = Arrays.asList(9, 1, 2, 3, 4, 5);int max = integers.stream().max(Comparator.comparingInt(x -> x)).get();int min = integers.stream().min(Comparator.comparingInt(x -> x)).get();System.out.println(max);System.out.println(min);//打印信息//9//1}private static void test5() {List<Integer> integers = Arrays.asList(9, 1, 2, 3, 4, 5);int count = (int) integers.stream().count();System.out.println(count);//打印信息//6}private static void test6() {List<Integer> integers = Arrays.asList(9, 1, 2);
//        int total = integers.stream().reduce((integer, integer2) -> integer + integer2).get();int total = integers.stream().reduce(Integer::sum).get();System.out.println(total);//打印信息//12}private static void test7() {List<Integer> integers = Arrays.asList(9, 1, 2, 3, 4, 5);integers.stream().map((i)-> i + "*").collect(Collectors.toList()).forEach(System.out::println);//打印信息//9*//1*//2*//3*//4*//5*}private static void test8() {List<Integer> integers = Arrays.asList(9, 1, 2, 3, 4, 5);integers.stream().flatMap((Function<Integer, Stream<String>>) integer -> Stream.of(integer + "#")).collect(Collectors.toList()).forEach(System.out::println);//打印信息//9#//1#//2#//3#//4#//5#}private static void test9() {List<Integer> integers = Arrays.asList(9, 1, 2, 3, 4, 5);integers.stream().sorted(Comparator.comparingInt(x -> x)).forEach(System.out::println);//打印信息//1//2//3//4//5//9}private static void test10() {List<Integer> integers = Arrays.asList(1, 1, 2, 2, 3, 5);integers.stream().distinct().sorted(Comparator.comparingInt(x -> x)).forEach(System.out::println);//打印信息//1//2//3//5}private static void test11() {List<Integer> integers = Arrays.asList(1, 1, 2, 2, 3, 5);System.out.println(integers.stream().map(x -> x + "").collect(Collectors.joining("|")));//打印信息//1|1|2|2|3|5}private static void test12() {List<Integer> integers = Arrays.asList(1, 5);System.out.println(integers.stream().collect(Collectors.averagingInt(x -> x)));//打印信息//3.0}

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