public class branch{
	String subname;
	int salary;
	int totalbooks;
	branch(String subname,int totalbooks){
		this.subname=subname;
		this.totalbooks=totalbooks;
	}
	 void calculatehrs(){
		salary=totalbooks*2;
		System.out.println(subname+"學科的總時數是:"+salary);
	}
	public static void main(String[] args){
		branch h=new branch("科學",10);
		science b=new science();
		b.ca(h);
		branch k=new branch("藝術",14);
		arts a=new arts();
		a.ca(k);
	}
}
class science{
	void ca(branch obj){
		obj.calculatehrs();
	}
}
class arts{
	void ca(branch obj){
		obj.calculatehrs();
	}
}