Java IO input-output stream FileWriter character stream

BYTE buffer stream

Why use wrapper flows, which are used to improve the performance of read and write operations. public class Packing_flowdemo {public static void main (string[] args) throws Exception {File File = new file ("File/packing _flow.txt ");//The notation of the wrapper stream, the buffer memory size. 1024*8=8192  (byte)//bufferedoutputstream packing = new Bufferedoutputstream (new FileOutputStream (file, True));// Packing.write ("Hello everyone!") How are you? How is your! ". GetBytes ());//packing.close ();     The read and write operation of the wrapper stream. Bufferedinputstream outpacking = new Bufferedinputstream (new FileInputStream (file)); byte[] buffer = new Byte[1024];int Len = -1;while ((len = outpacking.read (buffer))! =-1) {System.out.println (new String (buffer, 0, Len));}}}

public static void Main (string[] args) throws IOException {//For the code to look good, throw it directly out of file File=new file ("moves/Xu Song-makeup-field edition. mp3" ); File File1=new file ("moves/Xu Song-makeup. mp3"),//text (file, file1),//text2 (file, file1),//text3 (file, file1); Text4 (file, FILE1);} private static void text (File file,file file1) throws IOException {///node stream method, one byte read and write Long begin= System.currenttimemillis (); FileInputStream in=new fileinputstream (file); FileOutputStream out =new FileOutputStream (file1); int Len=-1;while ((Len=in.read ())!=-1) {out.write (len); In.close (); Out.close (); System.out.println (System.currenttimemillis ()-begin)//5547 milliseconds}private static void Text2 (File file,file file1) throws IOException {//Buffer stream notation, one byte read and write Long Begin=system.currenttimemillis (); Bufferedinputstream in=new Bufferedinputstream (new FileInputStream (file)); Bufferedoutputstream out =new Bufferedoutputstream (new FileOutputStream (file1)); int Len=-1;while (In.read ()!=-1) { Out.write (len);} In.close (); Out.close (); System.out.println (System.currenttimemillis ()-begin)//63 ms}private static void Text3 (File file,file file1) throws IOException {///node stream notation, one-time read 1024 bytes long begin= System.currenttimemillis (); FileInputStream in=new fileinputstream (file); FileOutputStream out =new FileOutputStream (file1); int len=-1;byte[] Buffer=new byte[1024];while ((len=in.read (buffer) ) {!=-1) {out.write (Buffer,0,len);} In.close (); Out.close (); System.out.println (System.currenttimemillis ()-begin)//38 milliseconds}private static void Text4 (File file,file file1) throws IOException {//Buffer stream notation, one-time read 1024 bytes long begin=system.currenttimemillis (); Bufferedinputstream in=new Bufferedinputstream (new FileInputStream (file)); Bufferedoutputstream out =new Bufferedoutputstream (new FileOutputStream (file1)); int len=-1;byte[] Buffer=new byte[ 1024];while ((len=in.read (buffer))!=-1) {out.write (Buffer,0,len);} In.close (); Out.close (); System.out.println (System.currenttimemillis ()-begin);//4 milliseconds}

Java IO input-output stream FileWriter character stream