org.checkerframework.checker.signedness.qual

Annotation Type Constant

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @SubtypeOf(value={Unsigned.class,Signed.class})
public @interface Constant

The value is a compile-time constant, and could be Signed or Unsigned.

See the Checker Framework Manual:

Signedness Checker