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Set<Rel> x = findByTop(id);
return x.stream()
   .filter(r -> r.getBottomOtyp() == otyp)
   .collect(Collectors.toSet());

Set<Rel> x = findByTop(id); return x.stream() .filter(r -> r.getBottomOtyp() == otyp) .collect(Collectors.toSet());

Set<Rel> x = findByTop(id);
x.removeIf(r -> (r.getBottomOtyp() != otyp));
return x;

Set<Rel> x = findByTop(id); x.removeIf(r -> (r.getBottomOtyp() != otyp)); return x;

set.stream().findFirst().orElse(null)

set.stream().findFirst().orElse(null)

set.stream()
    .filter(x -> x < 5)
    .forEach(x -> System.out.println(x))

set.stream() .filter(x -> x < 5) .forEach(x -> System.out.println(x))

set.stream()
    .filter(x -> x < 5)
    .skip(1)
    .limit(2)
    .forEach(x -> System.out.println(x))

set.stream() .filter(x -> x < 5) .skip(1) .limit(2) .forEach(x -> System.out.println(x))