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Copying Files

Copying Files

Question:
Is there a simple way of copying a file from one directory to another?

Answer:
There is no predefined convenient method for copying a file from oneplace to another. You have to do it the old fashioned way.

Open thesource file, open the destination file, read the source file a chunkat a time into a buffer, and write the buffer to the destination file.Here is some sample code for doing that, with minimal error checking:

import java.io.*;public class copy {  public static final int BUFFER_SIZE = 4096;  public static final void copyStream(InputStream input, OutputStream output,                                      byte[] buffer)    throws IOException  {    int bytesRead;    while((bytesRead = input.read(buffer)) != -1)      output.write(buffer, 0, bytesRead);  }  public static final void main(String[] args) {    byte[] buffer = new byte[BUFFER_SIZE];    BufferedInputStream input;    BufferedOutputStream output;    File destination;    if(args.length  2 || destination.isDirectory()) {        if(!destination.isDirectory()) {          System.err.println(     "When copying multiple files, last argument must be a directory.");          return;        }        for(int i=0; i 
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