Contoh yang dapat diamati Kotlin
This class was deprecated in API level Tiramisu.
This class and the Observer interface have been deprecated. The event model
supported by Observer and Observable is quite limited, the order of notifications
delivered by Observable is unspecified, and state changes are not in one-for-one
correspondence with notifications. For a richer event model, consider using the
java.beans package. For reliable and ordered messaging among threads, consider
using one of the concurrent data structures in the java.util.concurrent package.
For reactive streams style programming, see the java.util.concurrent.Flow API.
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