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Asked: 2026-06-06T13:44:53+00:00

I would like to emulate the following interface: interface MultiSideEffectFunction<T> { void action(T first,

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I would like to emulate the following interface:

interface MultiSideEffectFunction<T> {
    void action(T first, T second);
}

(it would save me from having to introduce a new interface)

is there a preferred Guava approach to doing this?

Note: I thought about doing it with

Function<Pair<T>, Void>

but there are two problems which makes the creation of a new interface preferable:

  1. One must define a class called Pair<T>, which looks a lot like a Map.Entry<T, T> with more appropriate getter names (as a second question: is there a Guava type like this?).
  2. The Void return type is always a pain – it would be better to have a genuine void signature.
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1 Answer

  1. Editorial Team

    Guava contributor here.

    The preferred Guava approach is to write your own interface.

    In particular, do not use Function; Function should only be used when the function doesn’t have side effects.

    Guava deliberately lacks a Pair type; we advise that any time you need a pair, you create your own class that attaches useful names to the two values, rather than the utterly uninformative “first” and “second”. (The prototypical example is for GPS coordinates; a class entitled LatLong is much more informative than a Pair<Double, Double>.)

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