public default DoubleConsumer andThen (DoubleConsumer after)

Returns a composed DoubleConsumer that performs, in sequence, this operation followed by the after operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation. If performing this operation throws an exception, the after operation will not be performed.

after    the operation to perform after this operation

Returns:  a composed DoubleConsumer that performs in sequence this operation followed by the after operation

NullPointerException    if after is null