java报错：cannot not resolve method compareTo(double)_山中有石为玉

最近开发，写了如下一段代码进行排序：

Collections.sort(dislist, new Comparator<Distance>(){
    public int compare(Distance dis1, Distance dis2){
        return dis1.getDis().compareTo(dis2.getDis());
    }
});Collections.sort(dislist,