package xiti6;
abstract class Shop{
abstract float sum();
}
class Rice extends Shop{
private float price;
private float weight;
Rice(float price,float weight){
this.price=price;
this.weight=weight;
}
float sum(){
return price*weight;
}
}
class Cola extends Shop{
private float price;
private int num;
Cola(float price,int num){
this.price=price;
this.num=num;
}
float sum(){
return price*num;
}
}
public class Sixth {
public static void main(String[] args) {
Rice rice=new Rice(4,5);
Cola cola=new Cola(2.8f, 5);
System.out.println("结账时共付款:"+(rice.sum()+cola.sum())+"元");
}
}