I\o operation

Function: Read and write data on device, hard disk file, memory, keyboard, network and so on.

Classification:

Data trend: Input stream, output stream

Data type: Character stream (text data reader or writer end)

Byte stream (end of all type stream)

1 bytes = 8 bits binary bytes are stored information units, units of measure

Character: a symbol of abstraction

Character set: encoding, ANSI encoding standard

BYTE Stream-character

FileInputStream fis = new FileInputStream ("Text.txt");

byte inpyt[] = new BYTE[21];

Fis.read (input);

String inputstring = new String (Input, "UTF-8");

Fis.close ();

Character---byte stream

FileOutputStream fos = new FileOutputStream ("Text.txt");

String outstring = "";

byte output[] = Outstring.getbytes ("UTF-8");

Fos.write (output);

Fos.close ();

File copy:

FileInputStream fis = new FileInputStream ("A.gif");

FileOutputStream fos = new FileOutputStream ("B.gif");

byte input[] = new BYTE[50];

while (Fis.read (input)!=-1) {fos.write (input);}

Fis.close ();

Fos.close ();

　　

I\o operation