ImmutableSet Sınıfı - Preserve Insertion Order

Giriş

Açıklaması şöyle

Guava’simmutable collections do not allow null elements (and, for maps, null values nor null keys). While this prevents a few use cases, in general it’s quite useful to know that you cannot have null elements in a collection.

They also preserve insertion order: an ImmutableSet can be iterated upon in the insertion order.

build metodu
ImmutableSet.Builder nesnesi döner.

copyOf metodu
Şöyle yaparız..

ImmutableSet.copyOf(heroes)

toImmutableSet metodu
Collector metodudur

Örnek

Şöyle yaparız.

collections
  .stream()
  .flatMap(collection -> loadKeys(...).stream())
  .collect(ImmutableSet.toImmutableSet());