Java Comparator和Comparabler的区别

一、 Comparable

 1 public class Person implements Comparable<Person>{

 2     public int Age;

 3     public String Name;

 4     public int compareTo(Person o) {

 5         // TODO Auto-generated method stub

 6         return this.Age-o.Age;

 7     }

 8 }

 9 

10 public static void main(String[] args) {

11         // TODO Auto-generated method stub

12         Person[] persons = new Person[2];//List<Person> persons = new ArrayList<Person>();

13         Person person1 = new Person();

14         person1.Age = 32;

15         person1.Name = "wyp";

16         persons[0] = person1;//persons.add(person1);

17         Person person2 = new Person();

18         person2.Age = 12;

19         person2.Name = "lx";

20         persons[1] = person2;//persons.add(person2);

21         

22         Arrays.sort(persons);//Collections.sort(persons);

23         for (Person person : persons) {

24             String content = String.format("Name:%s,Age:%s",person.Name,person.Age);

25             System.out.println("按Age排序");

26             System.out.println(content);

27         }

28     }

二、 Comparator

 1 public class NameSort implements Comparator<Person> {

 2 

 3     @Override

 4     public int compare(Person o1, Person o2) {

 5         // TODO Auto-generated method stub

 6         return o1.Name.compareTo(o2.Name);

 7     }

 8 }

 9 

10 public static void main(String[] args) {

11         // TODO Auto-generated method stub

12         

13         Person[] persons = new Person[2];//List<Person> persons = new ArrayList<Person>();

14         Person person1 = new Person();

15         person1.Age = 32;

16         person1.Name = "wyp";

17         persons[0] = person1;//persons.add(person1);

18         Person person2 = new Person();

19         person2.Age = 12;

20         person2.Name = "lx";

21         persons[1] = person2;//persons.add(person2);

22         

23         Arrays.sort(persons,new NameSort());//Collections.sort(persons,new NameSort());

24         for (Person person : persons) {

25             String content = String.format("Name:%s,Age:%s",person.Name,person.Age);

26             System.out.println("按Name排序");

27             System.out.println(content);

28         }

29     }