05IO緩衝流 提高IO效率

緩衝流的基本原理：是在建立流物件時，會建立乙個內建的預設大小的緩衝區陣列，通過緩衝讀寫，減少系統訪問次數，從而提高效率

bufferedinputstream bis =

newbufferedinputstream
(new
fileinputstream
("d.txt"))
;int len =0;
while
((len=bis.
read()
)!=-1
) bis.
close()
;

bufferedoutputstream bos =

newbufferedoutputstream
(new
fileoutputstream
("d.txt"
,true))
;for
(int a =
0; a<
10;a++
) bos.
flush()
; bos.
close()
;

bufferedreader br =

newbufferedreader
(new
filereader
("d.txt"))
; string line = null;
while
((line=br.
readline()
)!=null)
br.close()
;

bufferedwriter bw =

newbufferedwriter
(new
filewriter
("d.txt"))
;for
(int i =
0; i<
10;i++
) bw.
close()
;

I O基礎流 緩衝流

io流 字元流 轉換流 以下三句話功能相同 1 inputstreamreader isr new inputstreamreader new fileinputstream a.txt 預設字符集。2 inputstreamreader isr new inputstreamreader new ...

帶緩衝的IO流和不帶緩衝的IO流

先來看看不帶快取的i o和標準 帶快取的 i o都有那些 不帶快取的i o read,write,open.標準 帶快取的 i o fgets,fread,fwrite.這裡使用兩個對應的函式進行比較 ssize t write int filedes,const void buff,size t ...

IO流 位元組緩衝流，字元緩衝流

處理流 裝飾流 位元組緩衝流，字元緩衝流 用於提高位元組流的效能 bufferedinputstream，bufferedoutputstream 位元組緩衝流 bufferedinputstream is newbufferedinputstream new fileinputstream fil...