@Override
    public int hashCode() {
        final long n = ((long) window.hashCode() << 32) | key.hashCode();
        return (int) (n % 0xFFFFFFFFL);
    }
Return the window containing the values associated with this key.

@return the window containing the values
streams/src/main/java/org/apache/kafka/streams/kstream/Windowed.java