java stream filter populate list from stream code example

Example 1: find object with same attribute java stream

Optional<Person> matchingObject = objects.stream().
    filter(p -> p.email().equals("testemail")).
    findFirst();

Example 2: filter and map multiple fields from java stream

// Note that you shouldn't normally use == on objects
Predicate<Detail> itemPredicate = d-> item.equals(d.getItem());
Predicate<Detail> namePredicate = d-> name.equals(d.getName());

details.stream()
    .filter(itemPredicate.and(namePredicate))
    .collect(Collectors.toList());