为某公司编写一个工资支付系统，用于计算某一类员工的月薪。该公司共有四类员工：领固定月薪的（SalariedEmployee）；计时取酬的（HourlyEmployee，如果一月工时超过160小时，则还需对额外的工时支付加班费）；按销售额提成（CommissionEmployee）的和带底薪并按销售额提成的（BasePlusCommissionEmployee），其继承层次结构如下所示。已知每类员工均有表示员工工号、姓名和出生年月的属性，和用于计算员工月薪的方法。创建一个Employee变量数组，保存Employee类层次结构中每个具体类对象的引用，对每个Employee显示其工号、姓名、出生年月和月收入，如果当月是Employee的生日所在的月份，则还另发给他100月作为红包。用java实现

好的，以下是用 Java 实现的工资支付系统：

import java.util.Calendar;

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

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

    public abstract double calculateMonthlySalary();

    public void printEmployeeInfo() {
        System.out.println("工号：" + id);
        System.out.println("姓名：" + name);
        System.out.println("出生年月：" + birthMonth);
        System.out.println("月薪：" + calculateMonthlySalary());
    }

    public boolean isBirthdayMonth(int currentMonth) {
        return birthMonth == currentMonth;
    }

    public double getBonus() {
        if (isBirthdayMonth(Calendar.getInstance().get(Calendar.MONTH) + 1)) {
            return 100.0;
        } else {
            return 0.0;
        }
    }
}

class SalariedEmployee extends Employee {
    private double monthlySalary;

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

    @Override
    public double calculateMonthlySalary() {
        return monthlySalary + getBonus();
    }
}

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

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

    @Override
    public double calculateMonthlySalary() {
        double basicSalary = hourlyWage * workingHours;
        double extraHours = workingHours - 160.0;
        if (extraHours > 0) {
            basicSalary += hourlyWage * extraHours * 1.5;
        }
        return basicSalary + getBonus();
    }
}

class CommissionEmployee extends Employee {
    private double commissionRate;
    private double sales;

    public CommissionEmployee(String id, String name, int birthMonth, double commissionRate, double sales) {
        super(id, name, birthMonth);
        this.commissionRate = commissionRate;
        this.sales = sales;
    }

    @Override
    public double calculateMonthlySalary() {
        return commissionRate * sales + getBonus();
    }
}

class BasePlusCommissionEmployee extends CommissionEmployee {
    private double baseSalary;

    public BasePlusCommissionEmployee(String id, String name, int birthMonth, double commissionRate, double sales, double baseSalary) {
        super(id, name, birthMonth, commissionRate, sales);
        this.baseSalary = baseSalary;
    }

    @Override
    public double calculateMonthlySalary() {
        return super.calculateMonthlySalary() + baseSalary;
    }
}

public class SalaryPaymentSystem {
    public static void main(String[] args) {
        Employee[] employees = {
                new SalariedEmployee("001", "张三", 8, 10000.0),
                new HourlyEmployee("002", "李四", 5, 50.0, 180.0),
                new CommissionEmployee("003", "王五", 11, 0.1, 200000.0),
                new BasePlusCommissionEmployee("004", "赵六", 3, 0.08, 150000.0, 5000.0)
        };

        for (Employee employee : employees) {
            employee.printEmployeeInfo();
            System.out.println();
        }
    }
}

使用上述代码可以创建一个工资支付系统，其中定义了四种员工类型，每个员工类型都实现了 `calculateMonthlySalary()` 方法以计算月薪，同时也实现了 `printEmployeeInfo()` 方法以打印员工信息。在 `Employee` 类中还实现了 `isBirthdayMonth()` 和 `getBonus()` 方法以计算红包。

在 `SalaryPaymentSystem` 类中，创建了一个 `Employee` 变量数组，保存了每个具体类对象的引用。通过遍历数组，打印每个员工的信息。如果当月是员工的生日所在的月份，则还会另发给他100元作为红包。