org.checkerframework.checker.nullness.qual

Annotation Type Nullable

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @SubtypeOf(value={})
 @QualifierForLiterals(value=NULL)
 @DefaultFor(types=java.lang.Void.class)
public @interface Nullable

Nullable is a type annotation that indicates that the value is not known to be non-null (see NonNull). Only if an expression has a Nullable type may it be assigned null.

A programmer might write the type Nullable on an expression even if it never evaluates to null.

See Also:

NonNull, MonotonicNonNull, NullnessChecker

See the Checker Framework Manual:

Nullness Checker