Java, Lambda: How to find a List from a Collection of Lists with different Types?

Question

Which is the best way in Java 8 to get a List with elements of Type1 from a List of Lists -> (Records) {List<Type1>, List<Type2>, List<Type3>, ...} ?

Records has several Lists with different Types -> {List<Type1>, List<Type2>, List<Type3>, ...}

List<T> getList(T t) {
  // t is instance of Type1
  return Records -> List<t>;
}

Thanks so much for your help.

No, the Types are fully independent from each other. Thanks for your comment. — ThomasMuller
– ThomasMuller, Commented Oct 23, 2017 at 16:47

y.luis.rojo · Accepted Answer · 2017-10-23 16:42:59Z

1

class Utils<T> {

    List<T> getList(T t, List<List> list) {
        return list.stream().filter(i -> t.getClass().isInstance(i.get(0))).flatMap(List<T>::stream).collect(Collectors.toList());
    }
}

answered Oct 23, 2017 at 16:42

y.luis.rojo

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