2, Jifuryu
Jifuryu
Why is there a character stream?
After a coded character may occupy different number of bytes, and byte characters are not one to one relationship between the characters encoded could become unequal number of bytes
using a byte stream at the time of the operation of the text file is not very convenient, in the end can not accurately control the number of bytes for each character?
So Java provides a stream of characters designed to operate on the characters (character stream so only for text files)
can accurately get / put characters from the stream
Character set (encoding scheme) charSet
ASCII: American Standards Committee, represented by a 7-byte character ISO8859 -1 : Europe, Latin encoding with 8 byte represents a character GBK: Chinese encoding, represents a Chinese character two bytes GB2312: GBK upgraded version with more characters GB18030: GBK version replaced, but not very widely used BIG -5 : Traditional encoding Unicode: international standard code, the vast majority of the characters use two bytes of code, called Unicode encoding is UTF -8 : a Unicode encoding scheme to achieve, when the character appearing in the program need to write to a file on the hard disk, or transmitted over the network, specify a coding scheme, and the program thus compiled specific character word section features: a variable length encoding scheme, the encoded character could occupy 1 - 4 bytes: English one byte, Chinese generally occupies three bytes
Commutations
