如何在Java 8中从流中收集cusom类对象？

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In my problem I have Map<Flashcard, FlashcardStats> flashcards. Flashcard class contains two fields: String term and String definition. When I have to find specific flashcard from flashcards, how can I do I via Java 8 Streams? How can I collect Flashcard object or just definition field having only term?

例如：

    private static String getWrongAnswerMessage(Map<Flashcard, FlashcardStats> flashcards, String term, String answer) {

    Flashcard flashcard = flashcards.keySet().stream().filter(o -> o.getTerm().equals(term)).collect() //what now

先感谢您！