对LIST对象多个字段进行排序

jdk1.8之前的做法

参考: http://blog.youkuaiyun.com/enable1234___/article/details/53224740

jdk1.8新特性的做法：

参考: http://blog.youkuaiyun.com/aitangyong/article/details/54880228

Student.java

1. public class Student {

2. private Long id;

3. private String name;

4. private String age;

5. private Date birthday;

7. public Student() {

8. }

10. public Student(Long id, String name, String age) {

11. this.id = id;

12. this.name = name;

13. this.age = age;

14. }

16. public Student(String name, String age) {

17. this.name = name;

18. this.age = age;

19. }

21. public Student(String name, String age, Date birthday) {

22. this.name = name;

23. this.age = age;

24. this.birthday = birthday;

25. }

27. public Long getId() {

28. return id;

29. }

31. public void setId(Long id) {

32. this.id = id;

33. }

35. public String getName() {

36. return name;

37. }

39. public void setName(String name) {

40. this.name = name;

41. }

43. public String getAge() {

44. return age;

45. }

47. public void setAge(String age) {

48. this.age = age;

49. }

51. public Date getBirthday() {

52. return birthday;

53. }

55. public String getBirthdayStr() {

56. SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

57. return sdf.format(birthday);

58. }

60. public void setBirthday(Date birthday) {

61. this.birthday = birthday;

62. }

64. @Override

65. public String toString() {

66. return "Student [name=" + name + ", age=" + age + ", birthday=" + getBirthdayStr() + "]";

67. }

68. }

Listtest.java

1. public class ListTest {

2. @Test

3. public void test() {

4. List<Student> stuList = new ArrayList<Student>();

5. SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");

6. stuList.add(new Student("wang", "18", sdf.parse("2007/04/01")));

7. stuList.add(new Student("li", "19", sdf.parse("2007/05/01")));

8. stuList.add(new Student("liu", "20", sdf.parse("2006/04/01")));

9. stuList.add(new Student("xi", "15", sdf.parse("2007/04/01")));

10. stuList.add(new Student("li", "17", sdf.parse("2007/05/01")));

11. stuList.add(new Student("wang", "19", sdf.parse("2007/06/01")));

13. // age升序

14. Comparator<Student> byIdASC = Comparator.comparing(Student::getAge);

16. // named不分区大小写降序

17. Comparator<Student> byNameDESC = Comparator.comparing(Student::getName, String.CASE_INSENSITIVE_ORDER)

18. .reversed();

20. // birthday 降序

21. Comparator<Student> byBirthdayDESC = Comparator.comparing(Student::getBirthday).reversed();

23. // 联合排序

24. Comparator<Student> finalComparator = byIdASC.thenComparing(byNameDESC).thenComparing(byBirthdayDESC);

26. List<Student> result = stuList.stream().sorted(finalComparator).collect(Collectors.toList());

27. print(result);

28. // 输出结果:

29. // Student [name=xi, age=15, birthday=2007-04-01]

30. // Student [name=li, age=17, birthday=2007-05-01]

31. // Student [name=wang, age=18, birthday=2007-04-01]

32. // Student [name=wang, age=19, birthday=2007-06-01]

33. // Student [name=li, age=19, birthday=2007-05-01]

34. // Student [name=liu, age=20, birthday=2006-04-01]

36. }

37. }