用java编写一个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，你的问题是如何用Java编写一个某公司的雇员分为不同类的程序，要求封装属性和方法，并能计算某个月的工资。我可以为你提供一个解决方案：

首先，我们需要创建一个Employee类，定义姓名和生日月份两个私有属性：

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

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

    public double getSalary(int month) {
        double salary = 0;
        // 计算工资的逻辑
        return salary;
    }

    // getter和setter方法
    public String getName() {
        return name;
    }

    public int getBirthMonth() {
        return birthMonth;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setBirthMonth(int birthMonth) {
        this.birthMonth = birthMonth;
    }
}

然后，我们需要创建四个子类分别对应不同类型的雇员。首先是SalariedEmployee类：

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 (month == getBirthMonth()) {
            salary += 100;
        }
        return salary;
    }
}

接下来是HourlyEmployee类：

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 += (monthlyWorkHours - 160) * hourlySalary * 0.5;
        }
        if (month == getBirthMonth()) {
            salary += 100;
        }
        return salary;
    }
}

然后是SalesEmployee类：

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 (month == getBirthMonth()) {
            salary += 100;
        }
        return salary;
    }
}

最后是BasePlusSalesEmployee类：

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 (month == getBirthMonth()) {
            salary += 100;
        }
        return salary;
    }
}

最后，我们可以创建一个Employee数组，并将不同类型的雇员对象添加到该数组中：

public class Main {
    public static void main(String[] args) {
        Employee[] employees = new Employee[5];
        employees[0] = new SalariedEmployee("Tom", 8, 5000);
        employees[1] = new HourlyEmployee("Jerry", 10, 100, 180);
        employees[2] = new SalesEmployee("Lucy", 5, 100000, 0.1);
        employees[3] = new BasePlusSalesEmployee("Bob", 6, 80000, 0.08, 5000);
        employees[4] = new SalariedEmployee("Alice", 9, 6000);

        for (int i = 0; i < employees.length; i++) {
            System.out.println(employees[i].getName() + " earns " + employees[i].getSalary(8) + " RMB in August.");
        }
    }
}

在这个例子中，我们创建了一个包含5个不同类型雇员的Employee数组，并且调用每个雇员的getSalary方法计算8月份的工资。结果会输出每个雇员的姓名和工资。