下面是一些简单的方法的样例：
@GetMapping("/test")
public static void test() {
List<String> list = new ArrayList<String>();
list.add("3");
list.add("2");
list.add("1");
list.add("5");
list.add("4");
list.add("z");
for (String e : list) System.err.println(e);
// Stream 取最小值
Stream<String> stream = list.stream();
Optional<String> min = stream.min(String::compareTo);
if (min.isPresent()) System.out.println(min.get());
// Stream 取最大值
Optional<String> max = list.stream().max(String::compareTo);
if (max.isPresent()) System.out.println(max.get());
// Stream 取最大值
list.stream().max(String::compareTo).ifPresent(System.out::println);
// 存有序List
List<String> newList = new ArrayList<>();
// Stream 取有序List
Stream<String> sorted = list.stream().sorted();
sorted.forEach(elem -> newList.add(elem));
System.out.println(newList);
list.stream().sorted().forEach(elem -> System.out.println(elem));
// 过滤器
list.stream().filter(elem -> elem.equals("5") || elem.equals("z")).forEach(elem -> System.err.println("过滤1：" + elem));
}