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Editorial Team
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Asked: 2026-06-19T00:02:12+00:00

I have tree classes ClassA , ClassB and ClassC . ClassA and ClassB extends

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I have tree classes ClassA, ClassB and ClassC. ClassA and ClassB extends ClassC. I have merged Multimap<ClassC> and I have Collection of objects of different types. I wold like to get this objects from Collection but how to distinguish this objects? I have created Collection<? super ClassC> coll = multimap.get(key) and I wold like to get this objects using trnasform method but I don’t know how to distinguish object’s type. Can you give me advice? I appreciate every help.

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  1. Editorial Team

    By the sound of it you actually need to filter the collection down to the types you want:

    Collection<? super ClassC> coll = multimap.get(key);

Iterable<ClassA> classAs = Iterables.filter(coll, ClassA.class);
Iterable<ClassB> classBs = Iterables.filter(coll, ClassB.class);

    Update from @EtienneNeveu using the overload Iterables.filter(Iterable<?> unfiltered, Class<T> type) removes any type issues with my original answer.

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