第九周java作业

练习一：Java 2实用教程 第五版 160页第四题

Animal.java

package chapter6;public interface Animal {    void cry();    String getAnimalName();}
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Simulator.java

package chapter6;public class Simulator{    public void playSound(Animal animal){        animal.cry();        String animalNmae = animal.getAnimalName();        System.out.println(animalNmae+"在叫");        System.out.println();    }}
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Dog.java

package chapter6;public class Dog implements Animal {    @Override    public void cry() {        // TODO Auto-generated method stub        System.out.println("狗叫");    }    @Override    public String getAnimalName() {        // TODO Auto-generated method stub        return "狗";    }}
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Cat.java

package chapter6;public class Cat implements Animal {    @Override    public void cry() {        // TODO Auto-generated method stub        System.out.println("猫叫");    }    @Override    public String getAnimalName() {        // TODO Auto-generated method stub        return "猫";    }}
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Application.java

package chapter6;public class Application {    public static void main(String[] args) {        // TODO Auto-generated method stub        Simulator simulator = new Simulator();        simulator.playSound(new Dog());        simulator.playSound(new Cat());    }}
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运行截图: 

练习二： 
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，除了需要交学费外，还可以获取一部分科研津贴，由学校（University）统一发放。此外，学校还需要发放教师（Teacher）的工资。 
编写代码模拟上述场景： 
1)设计抽象类Student： 
属性包括姓名（name）、学费（fee）； 
方法包括： 
- 构造方法Student（String name） 
- 抽象方法void setFee（int fee） 
- 抽象方法int getFee（） 
2) 定义一个接口Salary：包含一个方法int getSalary(); 
3) 定义一个研究生类Graduate，继承Student类且实现Salary接口： 
新增属性：收入（salary） 
方法包括： 
- 构造方法Graduate（String name） 
- 重写void setFee（int fee） 
- 重写int getFee（） 
- 重写int getSalary（），研究生获得工资1500 
- 新增方法boolean isLoan（），判断是否需要贷款（若收入小于学费则需贷款） 
4) 定义一个教师类（Teacher）： 
属性包括：姓名（name）、收入（salary） 
方法包括： 
- 构造方法Teacher（String name） 
- 重写int getSalary（），教师获得工资3000 
5) 定义一个大学类（University），通过void payOff（Salary s）方法给研究生和教师发放并打印工资。 
6）定义主类Test，主函数中至少包括以下代码

student.java

package test;public abstract class Student {    String name;    int fee;    public Student(String name) {        super();        this.name = name;    }    abstract void setFee(int fee);    abstract int getFee();    public String getName() {        System.out.println("Student Name=="+name);        return name;    }}
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Salary.java

package test;public interface Salary {    int getSalary();    void setSalary(int salary);}
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Graduate.java

package test;public class Graduate extends Student implements Salary{    int salary;    public Graduate(String name) {        super(name);    }    @Override    void setFee(int fee) {        // TODO Auto-generated method stub        this.fee = fee;    }    @Override    int getFee() {        // TODO Auto-generated method stub        return fee;    }    @Override    public int getSalary() {        // TODO Auto-generated method stub        System.out.println("研究生工资:"+salary);        return salary;    }    boolean isLoan(){        if(salary < getFee()){            return true;        }else{            return false;        }    }    @Override    public void setSalary(int salary) {        // TODO Auto-generated method stub        this.salary = salary;    }}
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Teacher.java

package test;public class Teacher implements Salary{    String name;    int salary;    public Teacher(String name) {        super();        this.name = name;    }    @Override    public int getSalary() {        // TODO Auto-generated method stub        System.out.println("教师工资:"+salary);        return salary;    }    @Override    public void setSalary(int salary) {        // TODO Auto-generated method stub        this.salary = salary;    }    public String getName() {        System.out.println("Teacher Name=="+name);        return name;    }    public void setName(String name) {        this.name = name;    }}
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University.java

package test;public class University {    void payOff(Salary s){        if(s instanceof Graduate){            s.setSalary(1500);            s.getSalary();            ((Graduate) s).getName();        }else if(s instanceof Teacher){            s.setSalary(3000);            s.getSalary();            ((Teacher) s).getName();        }    }}
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Test.java

package test;public class Test {    public static void main(String[] args) {        // TODO Auto-generated method stub        Graduate graduate = new Graduate("小亮");        graduate.setFee(1000);        University university = new University();        university.payOff(graduate);        System.out.println("是否需要贷款:"+graduate.isLoan());        Teacher teacher = new Teacher("大王");        university.payOff(teacher);    }}
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运行截图: