Java | PTA练习：Employee类的层级结构

题目要求：

定义四个类，分别为Employee类、SalariedEmployee类、HourlyEmployee类和CommissionEmployee类。其中Employee类是其他三个类的父类。Employee类包含姓名和身份证号。除此之外，SalariedEmployee类还应包含每月工资；HourlyEmployee类还应包含每小时工资数和工作时间数；CommissionEmployee还应包含提成比例和销售总额。其中HourlyEmployee的工资为：每小时工资数×工作时间数，CommissionEmployee的工资为：提成比例×销售总额。每个类都应有合适的构造方法、数据成员的设置和读取方法。编写一个测试程序，创建这些类的对象，并输出与对象相关的信息。注意子类有时需调用父类的构造方法和被覆盖的方法，成员变量定义为private，对有些方法实现重载。测试程序如下所示：

    public static void main(String [] args){Scanner in=new Scanner(System.in);Employee [] e=new Employee[3];e[0]=new SalariedEmployee(in.next(),in.next(),in.nextDouble());e[1]=new HourlyEmployee(in.next(),in.next(),in.nextDouble(),in.nextDouble());e[2]=new CommissionEmployee(in.next(),in.next(),in.nextDouble(),in.nextDouble());for(int i=0;i<e.length;i++){    System.out.println(e[i].getSalary());System.out.println(e[i]);}
}

输入格式:

输入三行。第一行为一个SalariedEmployee对象的姓名，身份证号和每月工资。第二行为一个HourlyEmployee对象的姓名、身份证号、每小时工资数、工作时间。第三行为一个CommissionEmployee对象的姓名、身份证号、提成比例和销售总额。

输出格式:

输出三个对象的工资和对象的其他信息。每一个对象输出两行，第一行为工资，第二行为对象的信息。

输入样例:

Mike 0001 5000
Jack 0002 20 300
Tom 0003 0.2 50000

输出样例:

5000.0
SalariedEmployee[name=Mike,id=0001][monthSalary=5000.0]
6000.0
HourlyEmployee[name=Jack,id=0002][hourSalary=20.0,workhour=300.0]
10000.0
CommissionEmployee[name=Tom,id=0003][commissionRatio=0.2,sale=50000.0]

代码示例：

import java.util.*;class Employee{protected String name;protected String id;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getId() {return id;}public void setId(String id) {this.id = id;}public Employee() {}public Employee(String name, String id) {this.name = name;this.id = id;}public double getSalary() {return 0;}@Overridepublic String toString() {return "Employee [name=" + name + ",id=" + id + "]";}}class SalariedEmployee extends Employee{private double monthSalary;public double getmonthSalary() {return monthSalary;}public void setmonthSalary(double monthSalary) {this.monthSalary = monthSalary;}public double getSalary() {return this.monthSalary;}public SalariedEmployee(String name, String id ,double monthSalary) {super(name, id);this.monthSalary = monthSalary;}@Overridepublic String toString() {return "SalariedEmployee[name=" + name + ",id=" + id + "]"+"[monthSalary=" + monthSalary + "]";}}class HourlyEmployee extends Employee{private double hourSalary;private double workhour;public double gethourSalary() {return hourSalary;}public void sethourSalary(double hourSalary) {this.hourSalary = hourSalary;}public double getworkhour() {return workhour;}public void setworkhour(double workhour) {this.workhour = workhour;}public double getSalary() {return this.hourSalary*workhour;}public HourlyEmployee(String name, String id ,double hourSalary, double workhour) {super(name, id);this.hourSalary = hourSalary;this.workhour = workhour;}@Overridepublic String toString() {return "HourlyEmployee[name=" + name + ",id=" + id + "]"+"[hourSalary=" + hourSalary + ",workhour=" + workhour + "]";}
}class CommissionEmployee extends Employee{private double commissionRatio;private double sale;public double getcommissionRatio() {return commissionRatio;}public void setcommissionRatio(double commissionRatio) {this.commissionRatio = commissionRatio;}public double getsale() {return sale;}public void setsale(double sale) {this.sale = sale;}public double getSalary() {return this.commissionRatio*this.sale;}public CommissionEmployee(String name, String id,double commissionRatio, double sale) {super(name,id);this.commissionRatio = commissionRatio;this.sale = sale;}@Overridepublic String toString() {return "CommissionEmployee[name=" + name + ",id=" + id + "]"+"[commissionRatio=" + commissionRatio + ",sale=" + sale + "]";}
}public class Main{public static void main(String [] args){Scanner in=new Scanner(System.in);Employee [] e=new Employee[3];e[0]=new SalariedEmployee(in.next(),in.next(),in.nextDouble());e[1]=new HourlyEmployee(in.next(),in.next(),in.nextDouble(),in.nextDouble());e[2]=new CommissionEmployee(in.next(),in.next(),in.nextDouble(),in.nextDouble());for(int i=0;i<e.length;i++){    System.out.println(e[i].getSalary());System.out.println(e[i]);}}
}

注意要点：

应该只有一点吧，继承过程中的重写，意识要练起来。用父类的引用调用方法执行的是子类的Override代码。

        Employee [] e=new Employee[3];e[0]=new SalariedEmployee(in.next(),in.next(),in.nextDouble());e[1]=new HourlyEmployee(in.next(),in.next(),in.nextDouble(),in.nextDouble());e[2]=new CommissionEmployee(in.next(),in.next(),in.nextDouble(),in.nextDouble());for(int i=0;i<e.length;i++){    System.out.println(e[i].getSalary());System.out.println(e[i]);}