CompanySalary.java

abstract class Employee{
	public abstract double earnings();
}

class YearWorker extends Employee{
	public double earnings() {
		return 12000;
	}
}

class MonthWorker extends Employee{
	public double earnings() {
		return 12*6730;
	}
}

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 CompanySalary{
	public static void main(String args[]) {
		Employee []employee=new Employee[129];
		for(int i=0;i<employee.length;i++) {
			if(i%2==0) {
				employee[i]=new YearWorker();
			}else if(i%2==1) {
				employee[i]=new MonthWorker();
			}
		}
		Company company=new Company(employee);
		System.out.println("公司薪水总额："+company.salariesPay()+"元");
	}
}