System.out.println("\nHow many commodities you wanna buy:");
		n = sc.nextInt();
		ShoppingCart[] s = new ShoppingCart[n];
		System.out.println("Input the commodity's name and the numbers you wanna buy:");
		for(int i = 0;i < n;i++){
			Name = sc.next();
			for(int j = 0;j < 2;j++){
				if(Name.equals(c[j].name)){
					//Price = c[j].price;
					Num = sc.nextInt();
					s[i] = new ShoppingCart(Name,c[j].price,Num);
					break;
				}
			}
			
		}
		System.out.println("商品名称\t\t单价\t购买数量");
		for(int i = 0;i < n;i++){
			System.out.printf("%-10s%9d%12d%n",s[i].name,s[i].price,s[i].num);
		}
		for(int i = 0;i < n;i++){
			Sum += s[i].price*s[i].num;
		}
		System.out.printf("总计：%d",Sum);
		System.out.println("");