Java Comparator和Comparabler的区别

一、 Comparable

 public class Person implements Comparable<Person>{
     public int Age;
     public String Name;
     public int compareTo(Person o) {
         // TODO Auto-generated method stub
         return this.Age-o.Age;
     }
 }

 public static void main(String[] args) {
         // TODO Auto-generated method stub
         Person[] persons = new Person[2];//List<Person> persons = new ArrayList<Person>();
         Person person1 = new Person();
         person1.Age = 32;
         person1.Name = "wyp";
         persons[0] = person1;//persons.add(person1);
         Person person2 = new Person();
         person2.Age = 12;
         person2.Name = "lx";
         persons[1] = person2;//persons.add(person2);

         Arrays.sort(persons);//Collections.sort(persons);
         for (Person person : persons) {
             String content = String.format("Name:%s,Age:%s",person.Name,person.Age);
             System.out.println("按Age排序");
             System.out.println(content);
         }
     }

二、 Comparator

 public class NameSort implements Comparator<Person> {

     @Override
     public int compare(Person o1, Person o2) {
         // TODO Auto-generated method stub
         return o1.Name.compareTo(o2.Name);
     }
 }

 public static void main(String[] args) {
         // TODO Auto-generated method stub

         Person[] persons = new Person[2];//List<Person> persons = new ArrayList<Person>();
         Person person1 = new Person();
         person1.Age = 32;
         person1.Name = "wyp";
         persons[0] = person1;//persons.add(person1);
         Person person2 = new Person();
         person2.Age = 12;
         person2.Name = "lx";
         persons[1] = person2;//persons.add(person2);

         Arrays.sort(persons,new NameSort());//Collections.sort(persons,new NameSort());
         for (Person person : persons) {
             String content = String.format("Name:%s,Age:%s",person.Name,person.Age);
             System.out.println("按Name排序");
             System.out.println(content);
         }
     }