Question

Java新手求助！

题目如下图

Answer 1

public class Amimal implements Comparable<Amimal> {

private String name;
private int age;

@Override
public int compareTo(Amimal o) {
return o.getAge() - this.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 "[name="+this.name+",age="+this.age+"]";
}

}