# Nullable

Artifact: [androidx.annotation:annotation](https://developer.android.com/jetpack/androidx/releases/annotation) [View Source](https://cs.android.com/search?q=file:androidx/annotation/Nullable.jvm.kt+class:androidx.annotation.Nullable) Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/annotation#1.0.0)

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```
@MustBeDocumented
@Retention(value = AnnotationRetention.BINARY)
@Target(allowedTargets = [AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER, AnnotationTarget.VALUE_PARAMETER, AnnotationTarget.FIELD, AnnotationTarget.LOCAL_VARIABLE, AnnotationTarget.ANNOTATION_CLASS, AnnotationTarget.FILE])
@Target(value = [ElementType.METHOD, ElementType.PARAMETER, ElementType.FIELD, ElementType.LOCAL_VARIABLE, ElementType.ANNOTATION_TYPE, ElementType.PACKAGE])
public annotation Nullable
```

<br />

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Denotes that a parameter, field or method return value can be null.

When decorating a method call parameter, this denotes that the parameter can legitimately be null and the method will gracefully deal with it. Typically used on optional parameters.

When decorating a method, this denotes the method might legitimately return null.

This is a marker annotation and it has no specific attributes.