急需要一个关于继承的JAVA程序

public class Animal{ //动物类

}
class Dog extends Animal{ //狗 继承动物

}

class Person{
private String name;
private int age;
private String sex;
public Person(){}
public Person(String name,int age,String sex){
this.name=name;
this.age=age;
this.sex=sex;
System.out.println(name+age+sex);
}
public Person(String name){
this.name=name;
}
public Person(String name,String sex){
this.name=name;
this.sex=sex;
}

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

}
public String getName(){
return this.name;
}
public void setAge(int age){
this.age=age;

}
public int getAge(){
return this.age;
}

public void setSex(String sex){
this.sex=sex;

}
public String getSex(){
return this.sex;
}
}

class Student e