26、继承关系中的 CommissionEmployee 与 BasePlusCommissionEmployee 类

继承关系中的 CommissionEmployee 与 BasePlusCommissionEmployee 类

1. BasePlusCommissionEmployee 类的创建与使用

1.1 类的定义

BasePlusCommissionEmployee 类代表了一种除了佣金之外还能获得基本工资的员工。该类包含了员工的姓名、社保号码、销售总额、佣金率和基本工资等信息。以下是该类的部分代码：

// Fig. 9.6: BasePlusCommissionEmployee.java
// BasePlusCommissionEmployee class represents an employee who receives
// a base salary in addition to commission.

public class BasePlusCommissionEmployee
{
    private String firstName;
    private String lastName;
    private String socialSecurityNumber;
    private double grossSales; // gross weekly sales
    private double commissionRate; // commission percentage
    private double baseSalary; // base salary per week

    // six-argument constructor