Annotation Type Required
@Retention(RUNTIME) @Target(FIELD) public @interface RequiredThis annotation will mark the field or the element in
io.realm.RealmListas not nullable.
When a field of type
Boolean, Byte, Short, Integer, Long, Float, Double, String, byte, Dateis annotated with
Required, it cannot be set to
nulland Realm will throw an exception if it happens.
Fields with primitive types are implicitly required. Note,
Stringis not a primitive type, so in Java it is default nullable unless it is marked
\@Required. In Kotlin the reverse is true, so a
Stringis non-null. To specify a nullable String in Kotlin you should use
If this annotation is used on a
RealmList, the annotation is applied to the elements inside the list and not the list itself. The list itself is always non-null. This means that a list marked with this annotation are never allowed to hold
nullvalues even if the datatype would otherwise allow it. Realm will throw an exception if you attempt to store null values into a list marked
This annotation cannot be used on a
RealmAny, as the inner value of a RealmAny field is always nullable. Realm will throw an exception if you attempt mark a
Compiling will fail if the
Requiredannotation is put an a
RealmListcontaining references to other Realm objects.