接口-大学里的学生（Student）需要交学费，而研究生（Graduate）作为学生比较特殊，除了需要交学

本文链接：https://blog.youkuaiyun.com/Autistic_/article/details/78791796

本文通过具体的Java代码展示了如何使用抽象类和接口来实现特定的功能，包括定义学生类和教师类，并通过大学支付工资的例子说明了多态性的应用。

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package com.bzu.aa;

public abstract class Student {

String name;
int fee;

Student(String name){

}

abstract void setFee(int fee);
abstract int getFee();

}

package com.bzu.aa;
public interface Salary {

int getSalary();

}

package com.bzu.aa;

public class Graduate extends Student implements Salary {

int salary;

Graduate(String name) {
super(name);
}

void setFee(int fee){
this.fee = fee;
}

int getFee(){
return 0;
}

public int getSalary(){

return this.salary=1500;
}

boolean isLoan(){
if(this.salary<this.fee){
return true;
}
else
return false;

}

}

package com.bzu.aa;

public class Teacher implements Salary {
String name;
int salary;

Teacher(String name){

}

public int getSalary() {
return this.salary=3000;
}

}

package com.bzu.aa;

public class University {

void payOff(Salary s){
if(s instanceof Teacher){
s.getSalary();
}
else if(s instanceof Graduate){
s.getSalary();
}
}

}

package com.bzu.aa;

public class Test {

public static void main(String[] args) {
Graduate g = new Graduate("小亮");
g.setFee(1000);

University u = new University();
u.payOff(g);

System.out.println("是否需要贷款："+g.isLoan());

Teacher t = new Teacher("大王");
u.payOff(t);

}

}