@Override
    public boolean remove(@Nullable Object key, @Nullable Object value) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean replace(K key, V oldValue, V newValue) {
      throw new UnsupportedOperationException();
    }

    @Override
    public @Nullable V replace(K key, V value) {
      throw new UnsupportedOperationException();
    }