不用两个double直接进行强转是为了防止精度的损失

方式一：

    @Overridepublic int compareTo(Object o) {
//        System.out.println("**************");if(o instanceof Goods){Goods goods = (Goods)o;//方式一：if(this.price > goods.price){return 1;}else if(this.price < goods.price){return -1;}else{
//                return 0;return -this.name.compareTo(goods.name);}}
//        return 0;throw new RuntimeException("传入的数据类型不一致！");}

方式二：

   @Overridepublic int compareTo(Object o) {
//        System.out.println("**************");if(o instanceof Goods){Goods goods = (Goods)o;return Double.compare(this.price,goods.price);}
//        return 0;throw new RuntimeException("传入的数据类型不一致！");}