Copy files problem/ Storing byte [] in Vector

Question

Hey.
I am trying to write a tool to copy files from one location to various others.
I wrote a little scrap class to test the copy algorithm.
In the tool I want to read the input files only once and then just read the data from a Vector or something.
I tryed the following.
import java.io.*;
import java.util.*;
public class copytest
     public static void main(String args[])
          try
               File output = new File("f:/Ascii/test");
               if(!output.exists())
                    output.mkdirs();
               BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File("f:/Textfiles/test.txt")));
               BufferedOutputStream buf = new BufferedOutputStream(new FileOutputStream("f:/Ascii/test/t.txt"));
               int currend = -1;
               byte[] buffer = new byte[80];
               Vector tr = new Vector();
               while((currend = bis.read(buffer))!= -1)
                    tr.addElement(buffer);
//Store data for a while...
               System.out.println("Here");
               for(int i = 0; i<tr.size() ; i++)
                    byte[] bufe = (byte[])(tr.elementAt(i));
//Read it again...?
                    // THIS DOES NOT WORK!!!
                    buf.write(bufe, 0, bufe.length);
               buf.close();
               bis.close();
          catch(IOException e)
               System.out.println(e);
I hope U can help me...
THX
Martin
          

Answer 1

while((currend =bis.read(buffer))!= -1)
byte[] temp = new byte[currend];
System.arraycopy(buffer, 0, temp, 0, currend);
tr.addElement(temp);
//Store data for a while...
}Thanks! I will try that. I should have thought of that myself actually...
But, since that involves creating and
allocating memory for multiple arrays of bytes and
then holding them in memory, I really doubt you will
gain any performance at all compared to just
immediately writing out what you read.You are probably right. I just want to give it a shot. My tool works with threads and that would mean I would read the input x<=8 times simultaneously. Thats why I thought reading it once and than using an static Vector might be better...
But when it gets to a big amount of data.... I don't know....
Thanks!
Martin