update 删除班级前校验班级是否有学生

server-db/src/main/java/cn/exploring/engine/server/db/service/ClassService.java

@@ -108,7 +108,7 @@ public class ClassService {
         Map<Integer, List<StudentInfo>> classStudentMap = studentInfoService.selectStudentByClassIdListGroupByClassId(idList);
         if (!CollectionUtils.isEmpty(classStudentMap) && classStudentMap.values().stream().anyMatch(list -> !CollectionUtils.isEmpty(list))) {
             return classStudentMap.entrySet().stream().filter(entry -> !CollectionUtils.isEmpty(entry.getValue()))
-                    .map(entry -> StrUtil.format("班级[({}){}]存在学生{}名无法删除", entry.getKey(), classNameMap.get(entry.getKey()), entry.getValue().size()))
+                    .map(entry -> StrUtil.format("班级[{}]存在{}名学生无法删除", classNameMap.get(entry.getKey()), entry.getValue().size()))
                     .collect(Collectors.joining(", "));
         }