Java--io class, Byte throttle buffer

two ways to compare byte stream reading data
█ read one byte at a time █ read one byte array at a time        ? Improves operational efficiency by reading multiple data at a time

Public class Copydemo { //First step: Read the contents of 1.txt into memory FileInputStream ///Step two: Read the in-memory data into the 2.txt FileOutputStream //Use a byte stream to copy things will not appear garbled, because it is to copy all the things past, did not come out to parse Public static void Main (string[] args) throws IOException { FileInputStream fis = new FileInputStream ("My skateboard Shoes. mp4"); //Any file format can be copied FileOutputStream fos = new FileOutputStream ("Kaobei.mp4");

//Method One: Inefficient, one byte at a time / * int b = 0; While ((b = Fis.read ())! =-1) { Fos.write (b);                 }*/ //Method Two: High efficiency, an entire array at a time byte[] bytes = new byte[1024]; int len = 0; While (len = fis.read (bytes))! =-1) { Fos.write (Bytes,0,len);                 } fis.close (); Fos.close ();         } }

byte buffer stream (wrapper stream, with some buffers added 8092 byte)
█ byte stream the speed of reading and writing an array is significantly faster than reading and writing one byte at a time, which is a buffer effect added to the array, and Java itself is designed with this in mind, so it provides a bytes buffer stream █ byte buffered output stream         ? Bufferedoutputstream Bufferedinputstream (InputStream in); //Buffer size default is 8192 Create a Bufferedinputstream and save its arguments, which is input stream in for future use. Bufferedinputstream (inputstream in, int size); creates a value with the specified buffer size.
█ byte buffered input stream         ? Bufferedinputstream Bufferedoutputstream (OutputStream out); creates a new buffered output stream to write data to the specified underlying output stream. Bufferedoutputstream (outputstream out, int size); creates a new buffered output stream that writes data with the specified buffer size to the specified underlying output stream.

Public class Buffertestmain { Public static void Main (string[] args) throws IOException { FileInputStream fis = new FileInputStream ("My skateboard Shoes. mp4"); //Such FIS do not have buffers Bufferedinputstream Bfis = new Bufferedinputstream (FIS); FileOutputStream fos = new FileOutputStream ("Kaobei.mp4"); Bufferedoutputstream Bfos = new Bufferedoutputstream (FOS);

//Method One:/* int b = 0;While ((b = Bfis.read ())! =-1) {//appears to be a byte-by-byte read, in fact the system implementation is read 8,192 bytes to the buffer at a timeBfos.write (b); }*///Method two:Faster, the buffer comes with a 8192 buffer, and itself defines a 1024 buffer byte[] bytes = new byte[1024]; int len = 0;While (len = bfis.read (bytes))! =-1) {Bfos.write (bytes, 0, Len); }         } }

Java--io class, Byte throttle buffer