java 动态绑定

最新推荐文章于 2022-04-11 15:41:40 发布

slowalker_lee

最新推荐文章于 2022-04-11 15:41:40 发布

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分类专栏： java语言程序设计习题文章标签： java

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本文通过一个具体的Java案例，展示了如何使用继承来实现员工和经理之间的类关系。代码中定义了Employee和Manager两个类，Manager继承自Employee，并覆盖了getSalary方法以包含额外的奖金计算。此外，还演示了如何实例化这些类并调用其方法。

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file Employee.java

public class Employee
{
    private String name;
    private int age;
    private double salary;

    Employee()
    {
    }

    Employee(String name,int age)
    {
        this.name = name;
        this.age = age;
    }

    public String getName()
    {
        return name;
    }

    public int getAge()
    {
        return age;
    }

    public void setSalary(double salary)
    {
        this.salary = salary;
    }

    public double getSalary()
    {
        return salary;
    }

}

file Manager.java

public class Manager extends Employee
{
    private double bonus;

    Manager()
    {
    }

    Manager(String name,int age)
    {
        super(name,age);
    }

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

    public double getSalary()
    {
        double baseSalary = super.getSalary();
        return baseSalary + bonus;
    }
}

file TestEmployee.java

public class TestEmployee
{
    public static void main(String[] args)
    {
        Employee[] staff = new Manager[2];

        Manager boss1 = new Manager("Tommy",21);
        staff[0] = boss1;
        staff[0].setSalary(5000);//staff是Employee类型变量，只可访问Employee类下的方法
        boss1.setBonus(5000);//boss1是Manager类变量，可访问Manager类下的方法
        boss1.getSalary();//该方法是Manager中的方法

        Employee boss2 = new Manager("Peter",22);
        staff[1] = boss2;
        staff[1].setSalary(3000);
        boss2.getSalary();//boss2是Employee类变量，无法访问Manager下的域及方法

        for(Employee e:staff)
        {
            System.out.println("name = " + e.getName() + "\tage = " + e.getAge() + "\tsalary = " + e.getSalary());
        }

    }
}