5.2实验练习

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上转型对象

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());}}