Package org.checkerframework.checker.nonempty.qual

Annotation Interface NonEmpty

@Documented
@Retention(RUNTIME)
@Target({TYPE_PARAMETER,TYPE_USE})
@SubtypeOf(UnknownNonEmpty.class)
public @interface NonEmpty

The Collection, Iterator, Iterable, or Map, or Stream is definitely non-empty.

See the Checker Framework Manual:

Non-Empty Checker