why python is slower than java?
Brian Beck
exogen at gmail.com
Sun Nov 7 09:34:12 EST 2004
Pythogoras wrote:
> OK. I will rewrite it in Java.
>
> ///
> long t = currentTimeMillis();
> tryCopyFile("in.txt","out.txt");
> out.println( (currentTimeMillis() - t) / 1000);
> ///
>
> You lost. The Java-version is shorter!
> I didn't count import- and import static-statements
> because Eclipse cares about imports automatically.
I don't know what version of Java they're using in this troll's fantasy
land, but tryCopyFile does not, and has never existed in any Java
implementation. The real code for copying a file would look something
like the contents of this function (which is not a part of the standard
library):
public static void copy(File source, File dest) throws IOException {
FileChannel in = null, out = null;
try {
in = new FileInputStream(source).getChannel();
out = new FileOutputStream(dest).getChannel();
long size = in.size();
MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY,
0, size);
out.write(buf);
} finally {
if (in != null) in.close();
if (out != null) out.close();
}
}
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