A.URL B.URLConnection C.Socket D.DatagramSocket
A.java、io、OutputStream B.java、io、OutputStreamWriter C.java、io、EncodeOutputStream D.java、io、EncodeWriter
A.New BufferedInputStream(”in.txt”); B.New BufferedlnputStream(newFile(”in.txt”)); C.New BufferedlnputStream(newⅥHter(”in.txt”)); D.New BufferedlnputStream(new(”in.txt”));