8.8 以管道取代循环（Replace Loop with Pipeline）

资料参考：https://mkyong.com/java8/java-8-streams-filter-examples/

动机：简化了循环过程，代码的可读性更强

示例代码：

class Test {
    public static void main(String[] args) {
        List<String> fruits = Arrays.asList("apple", "orange", "banana");

        // method one 使用循环
        List<String> resultsOfLoop = getFilterOutput(fruits, "orange");
        for (String result : resultsOfLoop) {
            System.out.println(result);
        }

        System.out.println("=================");

        // method two 使用管道运算
        List<String> resultsOfPipeline =
            fruits.stream().filter(fruit -> !"orange".equals(fruit)).collect(Collectors.toList());
        resultsOfPipeline.forEach(System.out::println);
    }

    private static List<String> getFilterOutput(List<String> fruits, @NonNull String filter) {
        List<String> result = new ArrayList<>();
        for (String fruit : fruits) {
            if (!filter.equals(fruit)) {
                result.add(fruit);
            }
        }
        return result;
    }
}

运行结果：

apple
banana
=================
apple
banana