IO operations (file copy) based on the Java language

    static void main public (String [] args) { 
        // Get the value of the system time in milliseconds before starting a copy Long Start = the System. with currentTimeMillis (); // copy file, first set the source file location and destination location of the file File a sourceFile = new new File ( "D: /HAO/movie.mp4"); File descFile = new new File ( "D: /HAO1/movie.mp4"); // read stream BufferedInputStream Reader = null; // InputStream Reader = null; // write inflow BufferedOutputStream The write = null; // write the OutputStream = null; // read cycle, while the read while writing the try { Reader = new new BufferedInputStream ( new new the FileInputStream (a sourceFile)); write = new new BufferedOutputStream The ( new new a FileOutputStream (descFile));
        
        


 

 



 


 


Reader the FileInputStream new new = // (a sourceFile); 
// Write new new = a FileOutputStream (descFile); 
// define a B, read byte, byte by byte, for reading and writing 
// int B; 
/ / while (! (b = reader.read ()) = - 1) {// read 
// write.write (b); // write 
//} 
// or: a character array, the array is read by the press writing the array, increase the efficiency of byte [] = Data new new byte [ 1024]; int len; the while (! (len = reader.Read (Data)) = - . 1) { // read write.write (Data, 0, len ); // write } the System. Out.println ( "the OK"); } the catch (IOException E) { e.printStackTrace (); } the finally { the try { IF (Reader =! null) { reader.Close (); }
 
 
 






 
 


} The catch (IOException E) { 
e.printStackTrace (); 
} 
 the try { 
 IF (Write =! Null) { 
write.close (); 
} 
} the catch (IOException E) { 
e.printStackTrace (); 
} 
} 
 Long the System End = . with currentTimeMillis (); 
 // Get the value of the system time in milliseconds after the end of copying 
the system. Out.println ((Start-end) + "MS"); 
}