继承_练习_定义经理类

写代码前，先创建一个名为inheritance（继承）的包，以下所有代码都在该包中创建。

员工类

此类可直接复制。

package inheritance;

import java.time.LocalDate;

public class Employee {
    private final String name; // 姓名
    private double salary; // 薪水
    private final LocalDate hireDay; // 入职日期

    public Employee(String name, double salary, int year, int month, int day) {
        this.name = name;
        this.salary = salary;
        hireDay = LocalDate.of(year, month, day);
    }

    public String getName() {
        return name;
    }

    public double getSalary() {
        return salary;
    }

    public LocalDate getHireDay() {
        return hireDay;
    }

    public void raiseSalary(double byPercent) {
        double raise = salary * byPercent / 100;
        salary += raise;
    }
}

经理类

package inheritance;

public class Manager extends Employee {
    private double bonus; // 奖金

    public Manager(String name, double salary, int year, int month, int day) {
        super(name, salary, year, month, day);
    }

    public double getSalary() {
        double baseSalary = super.getSalary(); // 获取基本工资
        return baseSalary + bonus; // 薪水=基本工资+奖金
    }

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

经理Test类

package inheritance;

public class ManagerTest {
    public static void main(String[] args) {
        // 创建一个Manager对象,固定工资为15000
        Manager boss = new Manager("张三", 15000, 2019, 7, 1);
        boss.setBonus(5000); // 设置额外5000奖金
        Employee[] staff = new Employee[3];
        // 用Manager对象以及Employee对象填充员工数组,这里涉及"多态",可自行预学
        staff[0] = boss;
        staff[1] = new Employee("李四", 5000, 2022, 7, 15);
        staff[2] = new Employee("王五", 6500, 2023, 7, 15);

        // 输出所有员工对象的信息
        for (Employee e : staff) {
            System.out.printf("name=%s,salary=%.2f\n", e.getName(), e.getSalary());
        }
    }
}

输出：

name=张三,salary=20000.00
name=李四,salary=5000.00
name=王五,salary=6500.00

ManagerTest 2.0

package inheritance;

public class ManagerTest {
    public static void main(String[] args) {
        Manager boss = new Manager("张三", 8000, 2017, 12, 15);
        boss.setBonus(500);
        Employee[] staff = new Employee[3];
        staff[0] = boss;
        staff[1] = new Employee("李四", 5000, 2019, 10, 1);
        staff[2] = new Employee("王五", 4000, 2020, 3, 15);
        for (Employee e : staff) {
            System.out.printf("%s, %.2f\n", e.getName(), e.getSalary());
        }
    }
}