import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class Main {
public static void main(String[] args) throws Exception {
String fromFileName = "from.txt";
String toFileName = "to.txt";
BufferedInputStream in = new BufferedInputStream(new FileInputStream(fromFileName));
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(toFileName));
byte[] buff = new byte[32 * 1024];
int len;
while ((len = in.read(buff)) > 0)
out.write(buff, 0, len);
in.close();
out.close();
}
}