List and Map which allow you to have both variables and independent values managed by one Object.Scope instance.Serializable is!SelfSerializable instance.Serializer and also turn array of these objects back in to that very same Object!Serializer is powerful utility class that allows you to serialize any object in Java using universal protocol system.Serializer uses internally as an OOP programmatic interpretation of null.String will be serialized normally, for instance "Hello world!"CharSequence instance.