【fix sonar】 CategoryCodeRule.java文件

jero-boot/jero-boot-module-system/src/main/java/com/jero/modules/system/rule/CategoryCodeRule.java

@@ -46,13 +46,13 @@ public class CategoryCodeRule implements IFillRuleHandler {
         LambdaQueryWrapper<SysCategory> query = new LambdaQueryWrapper<SysCategory>().eq(SysCategory::getPid, categoryPid).isNotNull(SysCategory::getCode).orderByDesc(SysCategory::getCode);
         SysCategoryMapper baseMapper = (SysCategoryMapper) SpringContextUtils.getBean("sysCategoryMapper");
         List<SysCategory> list = baseMapper.selectList(query);
-        if (list == null || list.size() == 0) {
+        if (list == null || list.isEmpty()) {
             if (ROOT_PID_VALUE.equals(categoryPid)) {
                 //情况1
                 categoryCode = YouBianCodeUtil.getNextYouBianCode(null);
             } else {
                 //情况2
-                SysCategory parent = (SysCategory) baseMapper.selectById(categoryPid);
+                SysCategory parent =  baseMapper.selectById(categoryPid);
                 categoryCode = YouBianCodeUtil.getSubYouBianCode(parent.getCode(), null);
             }
         } else {