Web Reference: May 11, 2024 · One way we can protect our code is to add annotations such as @NotNull to our method parameters. By using @ NotNull, we indicate that we must never call our method with a null if we want to avoid an exception. Feb 11, 2011 · When calling Java libraries, it can take advantage of those annotations to let Kotlin tools know if a Java API can accept or return null. As far as I know, the only Nullable packages compatible with Kotlin are org.jetbrains.annotations and android.support.annotation (now androidx.annotation). Mar 28, 2026 · This blog post will provide a comprehensive guide on the `@NotNull` annotation, including its fundamental concepts, usage methods, common practices, and best practices.
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