大佬求解！定义一个学生类和在职研究生学费和工资问题

定义一个学生类(student)，成员变量：id(学号),name(姓名),fee(学费/年),成员方 法：获取学费 getFee（）； 定义一个在职研究生类(Graduate),它继承学生类，成员变量：pay(工资/月),成员方 法：获取工资 getPay()； 创建一个 Graduate 类的对象,统计他的年收入，如果年收入减去学费不足 12000 元， 则输出“you need a loan”(需要贷款),否则输出“your pay is enough!”

public void test(){
    class Student{
      private String id;
      private String name;
      private double fee;
      Student(String id,String name,double fee){
        this.id = id;
        this.name = name;
        this.fee = fee;
      }
      public double getFee(){
        return this.fee;
      }
    }
    class Graduate extends Student{
      private double pay;
      Graduate(String id,String name,double fee,double pay){
        super(id, name, fee);
        this.pay = pay;
      }
      public double getPay(){return this.pay;}
    }
    Graduate graduate = new Graduate("1234","张三",1000,10000);
    if((graduate.getPay()*12- graduate.getFee())<12000){
      System.out.println("you need a loan(需要贷款)");
    }else {
      System.out.println("your pay is enough!");
    }
  }