6-4 设计Worker类及其子类

Worker类是一个抽象类，其中包含了姓名、工龄、工资三个属性，以及计算工资的抽象方法calculateSalary()。

其子类可以根据不同的职业特点进行设计，例如：

1. Programmer类：继承自Worker类，重写calculateSalary()方法，根据工龄计算薪资。

2. Salesman类：继承自Worker类，重写calculateSalary()方法，根据销售业绩计算薪资。

3. Manager类：继承自Worker类，重写calculateSalary()方法，根据固定薪资和奖金计算总薪资。

示例代码如下：

public abstract class Worker {
    private String name;
    private int yearsOfWorking;
    private double salary;

    public Worker(String name, int yearsOfWorking, double salary) {
        this.name = name;
        this.yearsOfWorking = yearsOfWorking;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public int getYearsOfWorking() {
        return yearsOfWorking;
    }

    public double getSalary() {
        return salary;
    }

    public abstract double calculateSalary();
}

public class Programmer extends Worker {
    public Programmer(String name, int yearsOfWorking, double salary) {
        super(name, yearsOfWorking, salary);
    }

    @Override
    public double calculateSalary() {
        return getSalary() * (1 + 0.1 * getYearsOfWorking());
    }
}

public class Salesman extends Worker {
    private double sales;

    public Salesman(String name, int yearsOfWorking, double salary, double sales) {
        super(name, yearsOfWorking, salary);
        this.sales = sales;
    }

    public double getSales() {
        return sales;
    }

    public void setSales(double sales) {
        this.sales = sales;
    }

    @Override
    public double calculateSalary() {
        return getSalary() + 0.2 * getSales();
    }
}

public class Manager extends Worker {
    private double bonus;

    public Manager(String name, int yearsOfWorking, double salary, double bonus) {
        super(name, yearsOfWorking, salary);
        this.bonus = bonus;
    }

    public double getBonus() {
        return bonus;
    }

    public void setBonus(double bonus) {
        this.bonus = bonus;
    }

    @Override
    public double calculateSalary() {
        return getSalary() + getBonus();
    }
}