class BaseData
class ImgData extends BaseData
class FileData extends BaseData
sample:
BaseData data=new ImgData();
如何判断data 是ImgData 还是 FileData?
if (data instanceof ImgData){
}
用instanceof 关键字即可.
class BaseData
class ImgData extends BaseData
class FileData extends BaseData
sample:
BaseData data=new ImgData();
如何判断data 是ImgData 还是 FileData?
if (data instanceof ImgData){
}
用instanceof 关键字即可.