java 关于子类怎么添加自己新的属性？

abstract class Person {

String name

int age

String professional

Person(String name,int age,String professional) {

this.name= name

this.age = age

this.professional=professional

}

public abstract void display()

}

class Students extends Person {

int year

Students(String n,int a,String p,int year) {

super(n,a,p)

this.year=year

}

public void display() {

System.out.println("我的姓名="+ name + " " + "我的年龄="+age +" " +"我的专业="+professional+"我的出生年为"+year)

}

}

public class Test5 {

public static void main(String[] args) {

Person p = new Students("男",19,"美术")

Person o = new Students("女",14,"跳舞")

p.display()

o.display()

}

}

给某个对象动态不了属性的

但是可以通过集合类来实现

例如你可以用Map这个类来实现

map.put(key,value)

键值对都是泛型

之后通过map.get(key)来获取

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