Подстановочные знаки (Wildcards) в обобщениях
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Wildcards (?) solve the problem that List<Dog> is not a List<Animal>. They let you write methods that work with generic types in a flexible but still type-safe way. There are three kinds: unbounded (?), upper-bounded (? extends T), and lower-bounded (? super T).
Unbounded Wildcard — ?
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