java 第三次上机

Question

父子继承关系

class Father {
    float height;
    float weight;
    void hobby() {
        System.out.println("Father like swimming");
    }
}
class Son extends Father{
    String pro;
    void hobby() {
        System.out.println("Son like running");
    }
}
​
public class FatherAndSon {
​
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Father fa = new Father();
        fa.hobby();
        Son so = new Son();
        so.hobby();
    }
​
}
​

在读研究生问题

在读研究生问题
interface StudentManageInterface{
public abstract void setFree(double fee);
public abstract double getFree();
}
interface TeacherManageInterface{
public abstract double getPay();
public abstract void setPay(double pay);
}
class Graduate implements StudentManageInterface,TeacherManageInterface{
private String name,sex;
private int age;
private double fee,pay;
Graduate(){    
}
Graduate(String name,String sex,int age,double fee,double pay){
this.name=name;
this.sex=sex;
this.age=age;
this.fee=fee;
this.pay=pay;
}
public String getName(){
return name;
}
public String getSex(){
return sex;
}
public int getAge(){
return age;
}
public void setFree(double fee){
this.fee=fee;
}
public double getFree(){
return fee;
}
public void setPay(double pay){
this.pay=pay;
}
public double getPay() {
return pay;
}    
}
public class Test3_4 {
public static void main(String[] args){
Graduate gr=new Graduate("zhangsan","男",25,8000,3000);
judgeLoan(gr);
}
public static void judgeLoan(Graduate gr) {
if(gr.getPay()*12-gr.getFree()*2<2000){
System.out.println("provide a loan");
}
else 
System.out.println("don't need a loan");
}
}