Stream在java里的终止

long count()

List<Integer> demo = Arrays.asList(1, 2, 3, 4, 5, 6);

System.out.println(demo.stream().count());

-------result--------

6

//获取最小值

Optional<T> min(Comparator<? super T> comparator)

//获取值

Optional<T> max(Comparator<? super T> comparator)

List<Integer> demo = Arrays.asList(1, 2, 3);

Optional<Integer> min = demo.stream().min(Comparator.comparing(item->item));

Optional<Integer> max = demo.stream().max(Comparator.comparing(item->item));

System.out.println(min.get()+"-"+max.get());

-------result--------

1-3

    public void test3(){

        List<Student> studentList = StudentData.getStudents();

        //返回一个list

        List<Student> listStream = studentList.stream()

                .filter(e -> e.getAge() > 18)

                .collect(Collectors.toList());

        //返回一个Set

        Set<Student> setStream = studentList.stream()

                .filter(e -> e.getAge() > 18)

                .collect(Collectors.toSet());

        //返回其他的类型

}