5.2实验练习

abstract class Employee{
public abstract double earnings();
}
class YearWorker extends Employee{
public double earnings(){
double salaries=200000;
return salaries;
}
}
class MonthWorker extends Employee{
public double earnings(){
double salaries=12*20000;
return salaries;
}
}
class WeekWorker extends Employee{
public double earnings(){
double salaries=52*1000;
return salaries;
}
}
class Company{
Employee[]employee;
double salaries=0;
Company(Employee[]employee){
this.employee=employee;
}
public double salariesPay(){
salaries=0;
for(int i=0;i<employee.length;i++){
salaries=salaries+employee[i].earnings();
}
return salaries;
}
}

public class HardWork{
public static void main(String args[]){
Employee[]employee=new Employee[20];
for(int i=0;i<employee.length;i++){
if(i%3==0){
employee[i]=new WeekWorker();
}
else if(i%3==1){
employee[i]=new MonthWorker();
}
else if(i%3==2){
employee[i]=new YearWorker();
}
}
Company company=new Company(employee);
System.out.println("公司年工资总额："+company.salariesPay());
}
}