copy file using Java

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Java

copy-paste

i'm copying a file from one location to another using java using the following code:

InputStream fis = new FileInputStream(sourceFile);
OutputStream fos = new FileOutputStream(destFile);
byte[] databuf = new byte[1024];
int length;
while ((length = fis.read(databuf)) > 0) {

fos.write(databuf, 0, length);

}
fis.close();
fos.close();

But this program does not copy the file as fast as the windows explorer.
can anyone explain the reason?
is something wrong with my code or my approach?
Also suggest me if there is any other better(efficient) way of doing the same.