《Java实战开发经典》第六章6.6

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本文通过具体示例展示了Java中抽象类与继承的应用。通过定义抽象类Shop及其实现类Rice和Cola，演示了如何使用抽象方法sum()来计算不同商品的总价。Rice类基于价格和重量计算总价，而Cola类则基于单价和数量计算总价。

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);            
    //Cola cola =new Cola(2.8,5)会提示报错
    System.out.println("结账时共付款:"+(rice.sum()+cola.sum())+"元");
}
}