java报错：cannot resolve method compareTo(java.lang.double)

 

排序不正确写法：

        List<Map<String,Object>> sortList2 = list.stream().sorted((o1, o2) -> {
            if (o1.get("DAY_ACTUAL").toString().compareTo(o2.get("DAY_ACTUAL").toString()) > 0) {
                return -1;
            } else  return 1;
        }).collect(Collectors.toList());

 

排序不正确，需将 字符串转为 double 再排序

 

报错写法：

        List<Map<String,Object>> sortList2 = list.stream().sorted((o1, o2) -> {
            if ((Double)(o1.get("DAY_ACTUAL").toString().compareTo(Double)(o2.get("DAY_ACTUAL").toString()) > 0) {
                return -1;
            } else  return 1;
        }).collect(Collectors.toList());

 

解决方法：

将基础类型double转为java封装的Double类

调整后写法：

        List<Map<String,Object>> sortList2 = list.stream().sorted((o1, o2) -> {
            if (new Double(o1.get("DAY_ACTUAL").toString()).compareTo(new Double(o2.get("DAY_ACTUAL").toString())) > 0) {
                return -1;
            } else  return 1;
        }).collect(Collectors.toList());