Cola公司的雇员分为以下若干类:(知识点:多态) [必做
题]
• 4.1 ColaEmployee :这是所有员工总的父类,属性:员工的
姓名,员工的生日月份。方法:getSalary(int month) 根据参数
月份来确定工资,如果该月员工过生日,则公司会额外奖励
100 元。
• 4.2 SalariedEmployee : ColaEmployee 的子类,拿固定工
资的员工。属性:月薪
课后作业
• 4.3 HourlyEmployee :ColaEmployee 的子类,按小时拿工
资的员工,每月工作超出160 小时的部分按照1.5 倍工资发
放。属性:每小时的工资、每月工作的小时数
• 4.4 SalesEmployee :ColaEmployee 的子类,销售人员,
工资由月销售额和提成率决定。属性:月销售额、提成率
• 4.5 定义一个类Company,在该类中写一个方法,调用该
方法可以打印出某月某个员工的工资数额,写一个测试类
TestCompany,在main方法,把若干各种类型的员工放在一
个ColaEmployee 数组里,并单元出数组中每个员工当月的
工资。
1 package work15; 2 3 public class ColaEmployee { 4 protected String name; 5 protected int birthmonth; 6 7 8 public ColaEmployee() { 9 super(); 10 } 11 public ColaEmployee(String name, int month) { 12 super(); 13 this.name = name; 14 this.birthmonth = birthmonth; 15 } 16 public String getName() { 17 return name; 18 } 19 public void setName(String name) { 20 this.name = name; 21 } 22 public int getmonth() { 23 return birthmonth; 24 } 25 public void setmonth(int birthmonth) { 26 this.birthmonth = birthmonth; 27 } 28 public double getSalary(int month){ 29 return 0; 30 } 31 32 }
1 package work15; 2 3 public class SalariedEmployee extends ColaEmployee{ 4 double monthSalary; 5 6 public SalariedEmployee() { 7 super(); 8 9 } 10 11 public SalariedEmployee(String name, int birthmonth, double monthSalary) { 12 super(name, birthmonth); 13 this.monthSalary= monthSalary; 14 15 } 16 public double getSalary(int month){ 17 if(super.birthmonth==month){ 18 return monthSalary +100; 19 }else{ 20 return monthSalary; 21 } 22 } 23 24 25 }
1 package work15; 2 3 public class HourlyEmployee extends ColaEmployee{ 4 double hourSalary; 5 int hourSum; 6 public HourlyEmployee() { 7 super(); 8 9 } 10 public HourlyEmployee(String name, int birthmonth, double hourSalary,int hourSum) { 11 super(name, birthmonth); 12 this.hourSalary= hourSalary; 13 this.hourSum= hourSum; 14 15 } 16 public double getSalary(int month){ 17 if (super.birthmonth==month) { 18 if (hourSum>160) { 19 return hourSalary*160+hourSalary*(hourSum-160)*1.5+100; 20 }else{ 21 return hourSalary*160+hourSalary*(hourSum-160)*1.5; 22 } 23 }else{ 24 if (hourSum>160) { 25 return hourSalary*hourSum+100; 26 }else{ 27 return hourSalary*hourSum; 28 } 29 } 30 } 31 32 33 }
1 package work15; 2 3 public class SalesEmployee extends ColaEmployee{ 4 int monthSales; 5 double royaltyRate; 6 public SalesEmployee() { 7 super(); 8 9 } 10 public SalesEmployee(String name, int birthmonth, int monthSales,double royaltyRate) { 11 super(name, birthmonth); 12 this.monthSales=monthSales ; 13 this.royaltyRate=royaltyRate ; 14 15 } 16 public double getSalary(int month){ 17 if (super.birthmonth==month) { 18 return monthSales * royaltyRate +100; 19 }else{ 20 return monthSales * royaltyRate ; 21 } 22 } 23 24 25 }
1 package work15; 2 3 public class Company { 4 public void getSalary(ColaEmployee c,int month){ 5 System.out.println(c.name+"在"+month+"月的月薪为"+c.getSalary(month)+"元"); 6 } 7 8 }
1 package work15; 2 3 public class TestCompany { 4 5 6 public static void main(String[] args) { 7 ColaEmployee[] cel={ 8 new SalariedEmployee("月薪员工",7,3000), 9 new HourlyEmployee("时薪员工", 12, 10, 200), 10 new SalesEmployee("销售提成员工", 3, 300, 10) 11 }; 12 for (int i = 0; i < cel.length; i++) { 13 new Company().getSalary(cel[i], 3); 14 } 15 16 } 17 18 }
• 5、利用接口实现动态的创建对象[选做题]
• 5.1 创建4个类:
• 苹果
• 香蕉
• 葡萄
• 园丁
• 5.2 在三种水果的构造方法中打印一句话.
• 以苹果类为例
• class apple
• {
• public apple()
• {
• System.out.println(―创建了一个苹果类的对象‖);
}
• }
课后作业
• 类图如下:
• 5.3 要求从控制台输入一个字符串,根据字符串的
值来判断创建三种水果中哪个类的对象
1 package work; 2 3 import java.util.Scanner; 4 5 public interface Fruit { 6 7 } 8 class Apple implements Fruit { 9 public Apple() { 10 System.out.println("创建了一个苹果对象"); 11 } 12 } 13 14 class Banana implements Fruit { 15 public Banana() { 16 System.out.println("创建了一个香蕉对象"); 17 } 18 } 19 20 class Putao implements Fruit { 21 public Putao() { 22 System.out.println("创建了一个葡萄对象"); 23 } 24 } 25 26 class Gardener { 27 public Fruit create() { 28 Fruit f = null; 29 Scanner input = new Scanner(System.in); 30 String name = input.next(); 31 if (name.equals("苹果")) { 32 f = new Apple(); 33 } else if (name.equals("香蕉")) { 34 f = new Banana(); 35 } else if (name.equals("葡萄")) { 36 f = new Putao(); 37 } else { 38 System.out.println("不会种"); 39 } 40 return f; 41 42 } 43 }
1 package work; 2 3 public class Test { 4 5 public static void main(String[] args) { 6 Gardener g = new Gardener(); 7 g.create(); 8 } 9 }