设计一个人员类（Person），包含姓名，方法pay()代表人员的工资支出；方法toString()输出人员的信息。从Person类派生出教师类（Teacher）和大学生类（CollegeStudent），其中：教师的工资支出=基本工资+授课时数*30，大学生的工资支出=奖学金支出。 增加行政员工类（AdministrativeStaff），行政员工的工资支出=基础工资+考核奖励（优秀5000，良好3000，合格1000）。 （1）将人员类Person定义为抽象类，pay()为抽象方法，设计程序实现多态性。 （2）定义一接口，将pay定义为其抽象方法，设计程序实现多态性。

1. 设计一个人员类（Person），包含姓名，方法pay()代表人员的工资支出；方法toString()输出人员的信息。从Person类派生出教师类（Teacher）和大学生类（CollegeStudent），其中：教师的工资支出=基本工资 授课时数*30，大学生的工资支出=奖学金支出。 增加行政员工类（AdministrativeStaff），行政员工的工资支出=基础工资 考核奖励（优秀5000，良好3000，合格1000）。

(1) 将人员类Person定义为抽象类，pay()为抽象方法，设计程序实现多态性。

抽象类Person的定义如下：

public abstract class Person {
    private String name;

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public abstract double pay();

    public String toString() {
        return "Name: " + name + ", Pay: " + pay();
    }
}

教师类Teacher的定义如下：

public class Teacher extends Person {
    private double basicSalary;
    private int teachingHours;

    public Teacher(String name, double basicSalary, int teachingHours) {
        super(name);
        this.basicSalary = basicSalary;
        this.teachingHours = teachingHours;
    }

    public double pay() {
        return basicSalary + teachingHours * 30;
    }
}

大学生类CollegeStudent的定义如下：

public class CollegeStudent extends Person {
    private double scholarship;

    public CollegeStudent(String name, double scholarship) {
        super(name);
        this.scholarship = scholarship;
    }

    public double pay() {
        return scholarship;
    }
}

行政员工类AdministrativeStaff的定义如下：

public class AdministrativeStaff extends Person {
    private double basicSalary;
    private String assessment;

    public AdministrativeStaff(String name, double basicSalary, String assessment) {
        super(name);
        this.basicSalary = basicSalary;
        this.assessment = assessment;
    }

    public double pay() {
        double bonus = 0;
        if (assessment.equals("优秀")) {
            bonus = 5000;
        } else if (assessment.equals("良好")) {
            bonus = 3000;
        } else if (assessment.equals("合格")) {
            bonus = 1000;
        }
        return basicSalary + bonus;
    }
}

(2) 定义一接口，将pay定义为其抽象方法，设计程序实现多态性。

定义一个接口Payable，将pay定义为其抽象方法，Person、Teacher、CollegeStudent和AdministrativeStaff都实现Payable接口，实现多态性。

Payable接口的定义如下：

public interface Payable {
    public abstract double pay();
}

Person类的定义如下：

public abstract class Person implements Payable {
    private String name;

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public String toString() {
        return "Name: " + name + ", Pay: " + pay();
    }
}

教师类Teacher的定义如下：

public class Teacher extends Person {
    private double basicSalary;
    private int teachingHours;

    public Teacher(String name, double basicSalary, int teachingHours) {
        super(name);
        this.basicSalary = basicSalary;
        this.teachingHours = teachingHours;
    }

    public double pay() {
        return basicSalary + teachingHours * 30;
    }
}

大学生类CollegeStudent的定义如下：

public class CollegeStudent extends Person {
    private double scholarship;

    public CollegeStudent(String name, double scholarship) {
        super(name);
        this.scholarship = scholarship;
    }

    public double pay() {
        return scholarship;
    }
}

行政员工类AdministrativeStaff的定义如下：

public class AdministrativeStaff extends Person {
    private double basicSalary;
    private String assessment;

    public AdministrativeStaff(String name, double basicSalary, String assessment) {
        super(name);
        this.basicSalary = basicSalary;
        this.assessment = assessment;
    }

    public double pay() {
        double bonus = 0;
        if (assessment.equals("优秀")) {
            bonus = 5000;
        } else if (assessment.equals("良好")) {
            bonus = 3000;
        } else if (assessment.equals("合格")) {
            bonus = 1000;
        }
        return basicSalary + bonus;
    }
}