7、atePom_application_objectTrain_Part_Class defineTrain_Part_ClassProject_idPOM_string0-rwn defineTrain_Part_Classserial_numberPOM_string1-rwn save quit编写该文本要注意如下事项:1)Pom_application_object是父类,是系统定义的。将生成的新类Train_Part_Class是它的子类;2)Project_id和serial_number是显示于窗体上的属性名,它们可描述某产品的I