InputStream in = (InputStream) s.getInputStream();

OutputStream out = (OutputStream) s.getOutputStream();

视频上老师没类型转换啊，为什么我做的时候提醒要类型转换呢？？？

InputStream in = (InputStream) s.getInputStream();

OutputStream out = (OutputStream) s.getOutputStream();

视频上老师没类型转换啊，为什么我做的时候提醒要类型转换呢？？？