org.checkerframework.checker.nullness.qual

Annotation Type KeyForBottom

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @TargetLocations(value={EXPLICIT_LOWER_BOUND,EXPLICIT_UPPER_BOUND})
 @InvisibleQualifier
 @SubtypeOf(value=KeyFor.class)
 @DefaultFor(value=IMPLICIT_LOWER_BOUND)
public @interface KeyForBottom

The bottom type in the Map Key type system. Programmers should rarely write this type.

See the Checker Framework Manual:

Map Key Checker, the bottom type