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package snippet;import java.util.Arrays;/** * 使用Comparable接口：让待排序对象所在的类实现Comparable接口，并重写Comparable接口中的compareTo()方法 * 缺点是只能按照一种规则排序 * @author tong * */public class Compara {
       public static void main(String[] args) {        Person[] persons = new Person[5];        persons[0] =new Person("tom",45);        persons[1] =new Person("jack",12);        persons[2] =new Person("bill",21);        persons[3] =new Person("kandy",34);        persons[4] =new Person();        //关键        Arrays.sort(persons);        for (Person person:persons) {            System.out.println(person);        }    }}

下面是继承Comparable的Person类：

package snippet;class Person implements Comparable
   
    {    private String name;    private int age;    public Person(String name,int age){        this.name = name;        this.age = age;    }    public Person(){        this("unknown", 0);    }    //重写Student类的toString()方法，在输入对象时按照以下方式输出    @Override    public String toString() {              return "Person[name:"+name+",age:"+age+"]";    }    //重写该类的compareTo()方法，使其按照从小到大顺序排序    @Override    public int compareTo(Person o) {         return age-o.age;    }}
   

输出结果：

Person[name:unknown,age:0]Person[name:jack,age:12]Person[name:bill,age:21]Person[name:kandy,age:34]Person[name:tom,age:45]

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