Comparison of time spent in copying files by Java input and output streams _java

Nonsense is not much said, the key code as described below:

Package com.edu.xynu; 
Import Java.io.BufferedInputStream; 
Import Java.io.BufferedOutputStream; 
Import Java.io.File; 
Import Java.io.FileInputStream; 
Import Java.io.FileOutputStream; 
Import java.io.IOException; public class Iounitcopy {//per byte public static void Copybybyte (File srcfile,file destfile) throws ioexception{FileInput 
Stream fis=new FileInputStream (srcfile); 
FileOutputStream fos=new FileOutputStream (destfile); 
int i; 
while ((I=fis.read ())!=-1) {fos.write (i); 
} fis.close (); 
Fos.close (); }//By byte array public static void Copybybytearray (File srcfile,file destfile) throws ioexception{FileInputStream fis=new Fi 
Leinputstream (Srcfile); 
FileOutputStream fos=new FileOutputStream (destfile); 
byte []buf=new byte[10*1024]; 
int i; 
while ((I=fis.read (buf, 0, buf.length))!=-1) {fos.write (buf, 0, I); 
} fis.close (); 
Fos.close (); }//Byte buffered stream public static void Copybybuff (File srcfile,file destfile) throws ioexception{Bufferedinputstream bis=new Buf Feredinputstream (NewFileInputStream (srcfile)); 
Bufferedoutputstream bos=new Bufferedoutputstream (New FileOutputStream (DestFile)); 
int i; 
while ((I=bis.read ())!=-1) {bos.write (i); 
} bos.flush (); 
Bis.close (); 
Bos.close ();  }//byte array bulk read buffered output stream write to public static void Copybybuffarray (File srcfile,file destfile) throws ioexception{FileInputStream 
Bis=new FileInputStream (srcfile); 
Bufferedoutputstream bos=new Bufferedoutputstream (New FileOutputStream (DestFile)); 
byte [] buf=new byte[10*1024]; 
int Len; 
while ((Len=bis.read (buf,0,buf.length))!=-1) {bos.write (Buf,0,len); 
} bos.flush (); 
Bis.close (); 
Bos.close (); 
}} package Com.edu.xynu; 
Import Java.io.File; 
Import java.io.IOException; public class Iounitscopytest {public static void main (string[] args) {//TODO auto-generated method stub try {long 
Start=system.currenttimemillis (); Iounitcopy.copybybyte (New file ("C:\\1.mp3"), new file (//"C:\\2.mp3"));//90713ms//Iounitcopy.copybybytearray (new File ("C:\\1.mp3"), new file (///"C:\\3.mp3 "));//41ms//Iounitcopy.copybybuff (New file (" C:\\1.mp3 "), new file (//" C:\\4.mp3 "));//556ms//Iounitcopy.copy 
Bybytearray (New file ("C:\\1.mp3"), new file (//"C:\\5.mp3"));//30ms long End=system.currenttimemillis (); 
System.out.println (End-start); 
catch (IOException e) {//TODO auto-generated catch block E.printstacktrace (); } 
} 
}

The test file is