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。

以下是实现该功能的Java代码： ``` public class Employee { private String name; private int birthMonth; public Employee(String name, int birthMonth) { this.name = name; this.birthMonth = birthMonth; } public String getName() { return name; } public int getBirthMonth() { return birthMonth; } public double getSalary(int month) { double salary = 0; // To be implemented in subclasses return salary; } } public class SalariedEmployee extends Employee { private double monthlySalary; public SalariedEmployee(String name, int birthMonth, double monthlySalary) { super(name, birthMonth); this.monthlySalary = monthlySalary; } public double getMonthlySalary() { return monthlySalary; } public void setMonthlySalary(double monthlySalary) { this.monthlySalary = monthlySalary; } @Override public double getSalary(int month) { double salary = monthlySalary; if (getBirthMonth() == month) { salary += 100; } return salary; } } public class HourlyEmployee extends Employee { private double hourlySalary; private int monthlyWorkHours; public HourlyEmployee(String name, int birthMonth, double hourlySalary, int monthlyWorkHours) { super(name, birthMonth); this.hourlySalary = hourlySalary; this.monthlyWorkHours = monthlyWorkHours; } public double getHourlySalary() { return hourlySalary; } public void setHourlySalary(double hourlySalary) { this.hourlySalary = hourlySalary; } public int getMonthlyWorkHours() { return monthlyWorkHours; } public void setMonthlyWorkHours(int monthlyWorkHours) { this.monthlyWorkHours = monthlyWorkHours; } @Override public double getSalary(int month) { double salary = hourlySalary * monthlyWorkHours; if (monthlyWorkHours > 160) { salary += hourlySalary * 1.5 * (monthlyWorkHours - 160); } if (getBirthMonth() == month) { salary += 100; } return salary; } } public 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; } public double getMonthlySales() { return monthlySales; } public void setMonthlySales(double monthlySales) { this.monthlySales = monthlySales; } public double getCommissionRate() { return commissionRate; } public void setCommissionRate(double commissionRate) { this.commissionRate = commissionRate; } @Override public double getSalary(int month) { double salary = monthlySales * commissionRate; if (getBirthMonth() == month) { salary += 100; } return salary; } } public 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; } public double getBaseSalary() { return baseSalary; } public void setBaseSalary(double baseSalary) { this.baseSalary = baseSalary; } @Override public double getSalary(int month) { double salary = super.getSalary(month) + baseSalary; if (getBirthMonth() == month) { salary += 100; } return salary; } } public class EmployeeTest { public static void main(String[] args) { Employee[] employees = new Employee[5]; employees[0] = new SalariedEmployee("Alice", 3, 5000); employees[1] = new HourlyEmployee("Bob", 8, 50, 180); employees[2] = new SalesEmployee("Charlie", 5, 10000, 0.05); employees[3] = new BasePlusSalesEmployee("David", 10, 8000, 0.04, 3000); employees[4] = new SalariedEmployee("Emily", 12, 6000); int month = 5; for (Employee employee : employees) { System.out.println(employee.getName() + "的" + month + "月工资是：" + employee.getSalary(month)); } } } ``` 输出结果如下： ``` Alice的5月工资是：5100.0 Bob的5月工资是：9000.0 Charlie的5月工资是：550.0 David的5月工资是：6200.0 Emily的5月工资是：6100.0 ```