public static void print(String s) throws IOException {
if (out == null) {
systemout.println(s);
} else {
out.printf(s + "\n");
out.flush();
}
}
protected static void out(String s, Object... args) throws IOException {
if (out == null) {
systemout.println(sprintf(s, args));
} else {
out.printf(s + "\n", args);
out.flush();
}
}