//我是想做一个类似购买东西的例子，一个很基础的问题，我搞不清楚了


import


public class gouwu {                        //声明购物类；
    public static int f=20,now=0;            //f数组长度，now数组游标
    public static huowu hche[];              // 存放货物的 对象数组hche[]，

   
   
     class huowu {                            //声明货物类
            String name;
            int count;
            int price;
            public huowu(String n,int c,int p)
            {
                this.name=n;
                this.count=c;
                this.price=p;
            }
            public huowu(){
                this.name=null;
                this.count=0;
                this.price=0;
            }
            public void addh(huowu huo)
            {
                hche[now].name=huo.name;
                hche[now].count=huo.count;
                hche[now].price=huo.price;
            }
        }

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        gouwu gou=new gouwu();

        hche=new huowu[f];                    //对象数组的创建
            int m=1,n=0;
            String mn;
            for(;now<f&m==0;now++)
                {
                System.out.println("输入：");
                try {
                    m=System.in.read();
                    }
                catch (IOException e)
                    {
                        
                        e.printStackTrace();
                    }
                    mn="货物"+String.valueOf(m);
                 System.out.println("输入价格：");
               
                try {
                    n=System.in.read();
                } catch (IOException e) {
                    
                    e.printStackTrace();
                }
                huowu huo=gou.new huowu(mn,m,n);           // 创建货物对象
               
                huo.addh(huo);                               //添加到对象数组中
               
                }
            gou.jiaofei();
        
        
    }
     public void jiaofei()                                //讲数组中的货物总价值进行计算；
        {
            int sum=0;
            for(int i=0;i<=now;i++)
            {
                sum=sum+(hche[i].count*hche[i].price);        //提示是这里有错，我觉得可能是
                                                                //没有赋值的原因，该怎么解决？
            }
            System.out.println("总金额为"+sum);
        }

}
 

莫非是层次太低了吗？大伙看了看也不回。。。我在描述一下 ：对象数组就好比一个购物车 每种货物代表一个元素， 每种货物有 名字name 数量count 单价price   程序的过程就是将货物装入购物车（输入0时结束），最后将购物车中所以货物的总价值进行计算。       --程序是非常简单的，只是不知道问题出在哪，我纠结了很久了 望大伙指点迷津啊，不胜感激

好冷清。。为什么没人回呢？我是真找不到问题所在

import java.util.*;

public class Commodity {
    private String name;
    private int count;
    private double price;
    
    public Commodity(String name, int count, double price) {
        this.name = name;
        this.count = count;
        this.price = price;
    }

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        String name;
        int count;
        double price;
        ArrayList<Commodity> cart = new ArrayList<>();
        for (int i = 1; ; ++i) {
            System.out.print("输入第" + i + "个商品的数量：");
            count = reader.nextInt();
            if (count == 0)
                break;
            System.out.print("输入第" + i + "个商品的名字：");
            name = reader.next();
            System.out.print("输入第" + i + "个商品的单价：");
            price = reader.nextDouble();
            cart.add(new Commodity(name, count, price));
        }
        Iterator<Commodity> iter = cart.iterator();
        Commodity c;
        while (iter.hasNext()) {
            c = iter.next();
            System.out.println(c.name + ": $" + (c.count * c.price));
        }
        System.out.println("总价： $" + calc(cart));
    }
    
    public static double calc(ArrayList<Commodity> cart) {
        double total = 0.0;
        Iterator<Commodity> iter = cart.iterator();
        Commodity c;
        while (iter.hasNext()) {
            c = iter.next();
            total += c.count * c.price;
        }
        return total;
    }
}