package com.iit.demo2;


import java.util.Arrays;

public class DemoArray2 {
    public static void main(String[] args) {
        Dog2[] dogs = new Dog2[5];
        int index = 0;
        dogs[index++] = new Dog2("小黑1",15);
        dogs[index++] = new Dog2("小黑2",13);
        dogs[index++] = new Dog2("
 
小黑3",11);
        dogs[index++] = new Dog2("小黑4",9);
        dogs[index++] = new Dog2("小黑5",3);

        Arrays.sort(dogs);

        for(Dog2 d:dogs){
            System.out.println(d);
        }
    }
}

package com.iit.demo2;

public class Dog2 implements Comparable<Dog2> {
    private String name;
    
 
private int age;

    public Dog2(){}

    public Dog2(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        
 
return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    @Override
    public int compareTo(Dog2 o) {
        return this.getAge()-o.getAge();
    }
}