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);
        }
    }