employee.java

JAVA编程

public abstract class Employee {
	public abstract double earnings();
}
class YearWorker extends Employee{
	public double earnings(){
		return 24000;
	} //重写earnings()方法
}
class MonthWorker extends Employee{
	public double earnings(){
		return 2000*12;
	} //重写earnings()方法
}
class WeekWorker extends Employee{
	public double earnings(){
		return 400*60;
	}//重写earnings()方法
}