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 G2;
2
3 public class Colaemployee {
4 protected String name;
5 protected int month;
6
7 public void ColaEmployee() {
8
9 }
10
11 public void ColaEmployee(String name, int month) {
12
13 this.name = name;
14 this.month = month;
15 }
16
17 public String getName() {
18 return name;
19 }
20
21 public void setName(String name) {
22 this.name = name;
23 }
24
25 public int getMonth() {
26 return month;
27 }
28
29 public void setMonth(int month) {
30 this.month = month;
31 }
32
33 public double getSalary(int month) {
34 return 0;
35 }
36 }
1 package G2;
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 }
1 package G2;
2
3 public class HourlyEmployee extends Colaemployee {
4 protected int hour;
5 protected int hoursalary;
6
7 public HourlyEmployee() {
8 super();
9 }
10
11 public HourlyEmployee(String name, int month, int hour, int hoursalary) {
12 super();
13 this.hour = hour;
14 this.hoursalary = hoursalary;
15 }
16
17 public double getSalary(int month) {
18 if (super.month == month) {
19 if (hour > 160) {
20 return hoursalary * 160 + hoursalary * (hour - 160) * 1.5 + 100;
21 } else {
22 return hoursalary * hour + 100;
23 }
24 } else {
25 if (hour > 160) {
26 return hoursalary * 160 + hoursalary * (hour - 160) * 1.5;
27 } else {
28 return hoursalary * hour;
29 }
30 }
31 }
32
33 }
1 package G2;
2
3 public class SalariedEmployee extends Colaemployee {
4 private double salary;
5
6 public SalariedEmployee(double salary) {
7 super();
8 this.salary = salary;
9 }
10
11 public SalariedEmployee(String name, int month, double salary) {
12 super();
13 this.salary = salary;
14 }
15
16 public double getSalary(int month) {
17 if (super.month == month) {
18 return month + 100;
19 } else {
20 return salary;
21 }
22 }
23 }
1 package G2;
2
3 public class SalesEmployee extends Colaemployee {
4 protected int yuexiaoshou;
5 protected double tuchenglv;
6
7 public SalesEmployee() {
8 super();
9 }
10
11 public SalesEmployee(String name, int month, int yuexiaoshou, double tuchenglv) {
12 super();
13 this.yuexiaoshou = yuexiaoshou;
14 this.tuchenglv = tuchenglv;
15 }
16
17 public double getSalary(int month) {
18 if (super.month == month) {
19 return yuexiaoshou * tuchenglv + 100;
20 } else {
21 return yuexiaoshou * tuchenglv;
22 }
23 }
24 }
1 package G2;
2
3 public class testCompany {
4
5 public static void main(String[] args) {
6 // TODO Auto-generated method stub
7
8 // TODO Auto-generated method stub
9 Colaemployee c1[] = { new SalariedEmployee("a", 11, 20000), new HourlyEmployee("b", 6, 200, 200),
10 new SalesEmployee("c", 5, 330000, 0.5) };
11 for (int i = 0; i < c1.length; i++) {
12 new company().getSalary(c1[i], 5);
13 }
14 }
15
16
17 }
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 G3;
2
3 public interface Fruit {
4
5 }
6 class Apple implements Fruit {
7 public Apple() {
8 System.out.println("创建了一个苹果类的对象");
9 }
10 }
11
12 class Banana implements Fruit {
13 public Banana() {
14 System.out.println("创建了一个香蕉类的对象");
15 }
16 }
17
18 class Grape implements Fruit {
19 public Grape() {
20 System.out.println("创建了一个葡萄类的对象");
21 }
22 }
1 package G3;
2 import java.util.Scanner;
3 public class Gardener {
4 public static void main(String[] args) {
5 // TODO Auto-generated method stub
6 Gardener g = new Gardener();
7 g.create();
8 }
9
10 public Fruit create() {
11 Scanner input = new Scanner(System.in);
12 String name = input.next();
13 Fruit f = null;
14 if (name.equals("苹果")) {
15 f = new Apple();
16 }
17 if (name.equals("香蕉")) {
18 f = new Banana();
19 }
20 if (name.equals("葡萄")) {
21 f = new Grape();
22 }
23 return f;
24 }
25 }