多态形参题目

目录

题目 

 父类：Employee类

子类：Worker

子类：Manage

主类

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题目 

 父类：Employee类

package com.ploy_.polyparameter;

public class Employee {
    private String name;
    private double monthSalary;

    public Employee(String name, double monthSalary) {
        this.name = name;
        this.monthSalary = monthSalary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getMonthSalary() {
        return monthSalary;
    }

    public void setMonthSalary(double monthSalary) {
        this.monthSalary = monthSalary;
    }
    public double getAnnual(){
//        System.out.println("1");
        return 12*monthSalary;
    }
}

子类：Worker

package com.ploy_.polyparameter;

public class Worker extends Employee{
    public Worker(String name, double monthSalary) {
        super(name, monthSalary);
    }
    public void work(){
System.out.println("普通员工 "+getName()+" is working");
    }
    @Override
    public double getAnnual() {//因为普通员工无其它收入，则直接调用父类
       System.out.println("Worker:");
        return super.getAnnual();
    }
}

子类：Manage

package com.ploy_.polyparameter;

public class Manage extends Employee{
    private double bonus;

    public Manage(String name, double monthSalary, double bonus) {
        super(name, monthSalary);
        this.bonus = bonus;
    }

    public double getBonus() {
        return bonus;
    }

    public void setBonus(double bonus) {
        this.bonus = bonus;
    }
    public void manage(){
System.out.println("经理 "+getName()+" is managing");
    }

    @Override
    public double getAnnual() {
        System.out.println("Manage:");
        return super.getAnnual()+bonus;
    }
}

主类

package com.ploy_.polyparameter;
//多态参数
//方法定义的形参类型为父类类型，实参类型允许为子类类型
//实例1：主人喂动物
//实例2：
//定义员工类Employee,包含了姓名和月工资，以及计算年工资getAnnial的方法
//普通员工和经理继承了员工，经理类多了奖金bonus属性和管理manage方法，
//普通员工累多了work方法，普通员工和经理类要求分别重写getAnnual方法
//测试类中添加一个方法showEmpAnnal(Employee e),实现获取任何员工对象的年工资，并在main方法中调用该方法（e.getAnnual())
//测试类中添加一个方法，testWork，如果是普通员工，则调用work方法，如果是经理，则调用manage方法
public class PolyParameter {
    public static void main(String[] args) {
        Employee[] employes = new Employee[2];
        employes[0] = new Worker("jack", 2500);
        employes[1] = new Manage("jin", 5000, 20000);
        PolyParameter p = new PolyParameter();
        p.showEmpAnnal(employes[0]);
        p.showEmpAnnal(employes[1]);
        p.testWork(employes[0]);
        p.testWork(employes[1]);
    }
  public  void showEmpAnnal(Employee e){
        System.out.println(e.getAnnual());//动态绑定机制
    }
  public  void testWork(Employee e){
        if(e instanceof Worker){
            Worker w=(Worker) e;
            w.work();
        }
        if(e instanceof Manage){
            ((Manage) e).manage();
        }


    }
}