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kotlinlang

Question about Kotlin vs Java generics:

this compiles just fine in Kotlin
```open class Animal&lt;T1, T2&gt;

class Cat&lt;I&gt; : Animal&lt;I, List&lt;I&gt;&gt;()

val x: Animal&lt;String, List&lt;String&gt;&gt; = Cat()```
however trying to do the same instantiation in java fails:
```Animal&lt;String, List&lt;String&gt;&gt; x = new Cat&lt;String&gt;() // error```
Is there something I can do to improve the generics in the Kotlin code so that they can be used from Java just like from Kotlin?

```class Cat&lt;I&gt; : Animal&lt;I, List&lt;@JvmSuppressWildcards I&gt;&gt;()```

that fixed it! thanks… just not sure why is it needed..

declaring the same 2 classes in Java works in both Java and Kotlin :thinking_face:

because Kotlin's `List` is declared with an `out` type parameter, the translation to Java is normally `List&lt;? extends String&gt;`. this is more general than a Java `List&lt;String&gt;` (well, not for `String` in particular because it's `final`, but the typechecker doesn't know that)