问题如题，在线等啊！！
代码：
IExamMgrAssignPlusTeacherArrangementService examMgrAssignPlusTeacherArrangementService;
public void setExamMgrAssignPlusTeacherArrangementService(
IExamMgrAssignPlusTeacherArrangementService examMgrAssignPlusTeacherArrangementService) {
this.examMgrAssignPlusTeacherArrangementService = examMgrAssignPlusTeacherArrangementService;
}不会报空指针的，