org.checkerframework.checker.nullness.qual

Annotation Type KeyForBottom

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

Used internally by the type system; should never be written by a programmer.

See the Checker Framework Manual:

Map Key Checker