index = (hashCode & 0x7FFFFFFF) % mapTable.length;
            for (Entry<K, V> e = mapTable[index]; e != null; e = e.next) {
                if (e.hashCode == hashCode && key.equals(e.key)) {
                    return swapValue(e, value);
                }
            }
        } else {
            for (Entry<K, V> e = mapTable[0]; e != null; e = e.next) {
                if (e.key == null) {