五、编程题 某公司的雇员分为以下若干类： (1) Employee：这是所有员工总的父类。 ① 属性：员工的姓名,员工的生日月份 ② 方法：getSalary(int month) 根据参数月份来确定工资，如果该月员工过生日，则公司会 额外奖励100 元。 (2) SalariedEmployee：Employee 的子类，拿固定工资的员工。 ① 属性：月薪。 (3)HourlyEmployee：Employee 的子类，按小时拿工资的员工，每月工作超出160小时的部分按照1.5 倍工资发放。 ① 属性：每小时的工资、每月工作的小时数。 (4) SalesEmployee：Employee 的子类，销售，工资由月销售额和提成率决定。 ① 属性：月销售额、提成率。 (5) BasePlusSalesEmployee：SalesEmployee 的子类，有固定底薪的销售人员，工资由底薪加 上销售提成部分。 ① 属性：底薪。 要求： 创建一个Employee 数组，分别创建若干不同的Employee对象，并打 印某个月的工资。 注意：要求把每个类都做成完全封装，不允许非私有化属性。

好的，我可以帮你解答这道编程题。你可以参考以下代码实现：

abstract class Employee {
    private String name;
    private int birthMonth;

    public Employee(String name, int birthMonth) {
        this.name = name;
        this.birthMonth = birthMonth;
    }

    public abstract double getSalary(int month);

    public String getName() {
        return name;
    }

    public int getBirthMonth() {
        return birthMonth;
    }
}

class SalariedEmployee extends Employee {
    private double monthlySalary;

    public SalariedEmployee(String name, int birthMonth, double monthlySalary) {
        super(name, birthMonth);
        this.monthlySalary = monthlySalary;
    }

    @Override
    public double getSalary(int month) {
        double salary = monthlySalary;
        if (getBirthMonth() == month) {
            salary += 100;
        }
        return salary;
    }
}

class HourlyEmployee extends Employee {
    private double hourlyWage;
    private double monthlyHours;

    public HourlyEmployee(String name, int birthMonth, double hourlyWage, double monthlyHours) {
        super(name, birthMonth);
        this.hourlyWage = hourlyWage;
        this.monthlyHours = monthlyHours;
    }

    @Override
    public double getSalary(int month) {
        double salary = hourlyWage * monthlyHours;
        if (monthlyHours > 160) {
            salary += hourlyWage * 0.5 * (monthlyHours - 160);
        }
        if (getBirthMonth() == month) {
            salary += 100;
        }
        return salary;
    }
}

class SalesEmployee extends Employee {
    private double monthlySales;
    private double commissionRate;

    public SalesEmployee(String name, int birthMonth, double monthlySales, double commissionRate) {
        super(name, birthMonth);
        this.monthlySales = monthlySales;
        this.commissionRate = commissionRate;
    }

    @Override
    public double getSalary(int month) {
        double salary = monthlySales * commissionRate;
        if (getBirthMonth() == month) {
            salary += 100;
        }
        return salary;
    }
}

class BasePlusSalesEmployee extends SalesEmployee {
    private double baseSalary;

    public BasePlusSalesEmployee(String name, int birthMonth, double monthlySales, double commissionRate, double baseSalary) {
        super(name, birthMonth, monthlySales, commissionRate);
        this.baseSalary = baseSalary;
    }

    @Override
    public double getSalary(int month) {
        double salary = super.getSalary(month) + baseSalary;
        if (getBirthMonth() == month) {
            salary += 100;
        }
        return salary;
    }
}

public class Main {
    public static void main(String[] args) {
        Employee[] employees = new Employee[5];
        employees[0] = new SalariedEmployee("Tom", 3, 5000);
        employees[1] = new HourlyEmployee("Jim", 7, 50, 180);
        employees[2] = new SalesEmployee("Lucy", 9, 100000, 0.1);
        employees[3] = new BasePlusSalesEmployee("Lily", 12, 80000, 0.08, 5000);
        employees[4] = new HourlyEmployee("Jack", 5, 60, 140);

        int month = 9;
        for (Employee employee : employees) {
            System.out.println(employee.getName() + "'s salary in month " + month + " is " + employee.getSalary(month));
        }
    }
}

在这个程序中，我们定义了一个抽象类 `Employee`，包含员工的基本属性和方法。然后，我们创建了四个子类来继承 `Employee`，分别是 `SalariedEmployee`、`HourlyEmployee`、`SalesEmployee` 和 `BasePlusSalesEmployee`。每个子类中都重写了 `getSalary` 方法，以根据不同的工资计算方式来计算员工的工资。

在 `Main` 类中，我们创建了一个 `Employee` 数组，并分别创建了不同类型的员工对象。然后，我们遍历数组，调用 `getSalary` 方法来计算每个员工在给定月份的工资，并输出结果。

希望这个答案能够帮助到你！