1、list<Integer>的正序
List<Integer> list = new ArrayList<>();list.add(50);list.add(45);list.add(25);list.add(98);list.add(32);List<Integer> collect = list.stream().sorted().collect(Collectors.toList());System.out.println("list<Integer>元素正序：" + collect);打印结果：list<Integer>元素正序：[25, 32, 45, 50, 98]
2、list<Integer>的倒序
List<Integer> list = new ArrayList<>();list.add(50);list.add(45);list.add(45);list.add(98);list.add(32);List<Integer> collect = list.stream().sorted(Comparator.reverseOrder()).collect(Collectors.toList());System.out.println("list<Integer>元素倒序：" + collect);打印结果：list<Integer>元素倒序：[98, 50, 45, 45, 32]
3、List<Person>的元素的属性值正序
Person p1 = new Person("张三", new BigDecimal("50.0"));Person p2 = new Person("王五", new BigDecimal("25.0"));Person p3 = new Person("李四", new BigDecimal("68.0"));Person p4 = new Person("李四", new BigDecimal("17.0"));Person p5 = new Person("张三", new BigDecimal("45.0"));List<Person> list = new ArrayList<>();list.add(p1);list.add(p2);list.add(p3);list.add(p4);list.add(p5);list.sort(Comparator.comparing(person -> person.getSalary()));System.out.println(list);打印结果：元素的属性值正序：[{name='李四', salary=17.0}, {name='王五', salary=25.0}, {name='张三', salary=45.0}, {name='张三', salary=50.0}, {name='李四', salary=68.0}]
4、List<Person>的元素的属性值倒序
Person p1 = new Person("张三", new BigDecimal("50.0"));Person p2 = new Person("王五", new BigDecimal("25.0"));Person p3 = new Person("李四", new BigDecimal("68.0"));Person p4 = new Person("李四", new BigDecimal("17.0"));Person p5 = new Person("张三", new BigDecimal("45.0"));List<Person> list = new ArrayList<>();list.add(p1);list.add(p2);list.add(p3);list.add(p4);list.add(p5);List<Person> collect = list.stream().sorted(Comparator.comparing(Person::getSalary).reversed()).collect(Collectors.toList());System.out.println("元素的属性值倒序：" + collect);打印结果：元素的属性值倒序：[{name='李四', salary=68.0}, {name='张三', salary=50.0}, {name='王五', salary=45.0}, {name='张三', salary=45.0}, {name='李四', salary=17.0}]