Java子类中的继承

Question

我试图写一个类（SalaryEmployee）和子类（ComissionEmployee)，但我没有得到正确的工资，我不能做SE1.SetSalesMount(20000)。我哪里出了问题？

这是主要的：

public static void main(String[] args) {
    SalaryEmployee se1 = new CommissionEmployee("E3", "John", 10000);  
    se1.setSalesAmount(20000) // not found
    System.out.println(se1.getSalary());

}

public class SalaryEmployee  {
    private String id;
    private String name;
    double salary;

    public SalaryEmployee(String id, String name, double salary) {
        this.id = id;
        this.name = name;
        this.salary = salary;
    }

    public double getSalary() {
        return salary;
    }

    public String toString() {
        return "ID=" + id + " Name=" + name + " Salary=" + salary;
    }
}

public class CommissionEmployee extends SalaryEmployee {

    private double baseSalary;
    private double salesAmount;

    public CommissionEmployee(String id, String name, double salary) {
        super(id, name, salary);
        this.baseSalary = salary;

    }

    public void setSalesAmount(double amount) {
        this.salesAmount = amount;
    }

    public double getSalesAmount() {
        return salesAmount;
    }

    public double getSalary() {
        if (salesAmount <= 10000 || salesAmount < 20000) {
            return 1.03 * baseSalary;
        } else if (salesAmount > 20000) {
            return 1.05 * baseSalary;
        } else if (salesAmount < 10000) {
            return baseSalary;
        }
        return baseSalary;
    }
}

Answer 1

您将se1创建为SalaryEmployee类型，该类型没有setsalesamount()方法。因此，您需要将se1降至CommissionEmployee：

((CommissionEmployee)se1).setSalesAmount(20000)