Mondai14_2.java

abstract class Arbeit{
	int kingaku=0;
	abstract void calc(int hour);
	void hyouji(){
		System.out.println("got " + kingaku + " yen.");
	}
}

class Convenience extends Arbeit{
	void calc(int hour){
		System.out.println("worked " + hour + " hour(s) at a convenience store.");
		kingaku += hour*1000;
	}
}

class CDshop extends Arbeit{
	void calc(int hour){
		System.out.println("worked " + hour + " hour(s) at a CD shop.");
		kingaku += hour*850;
	}
}

class GasStation extends Arbeit{
	void calc(int hour){
		System.out.println("worked " + hour + " hour(s) at a gas station.");
		kingaku += hour*1000 + 500;
	}
}

class Mondai14_2{
	public static void main(String[] args){
		GasStation gs = new GasStation();
		Convenience cv = new Convenience();
		CDshop cd = new CDshop();
		gs.calc(3);
		cv.calc(4);
		cd.calc(2);
		cd.hyouji();
	}
}