Uses of Interface java.util.Observer (Java SE 11 & JDK 11 )

## Uses of Interface
java.util.Observer

- Packages that use Observer
  Package | Description
  --- | ---
  java.util | Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.

- - ### Uses of Observer in java.util

    Methods in java.util with parameters of type Observer
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | Observable.`addObserver​(Observer o)` | Deprecated. Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set.
    `void` | Observable.`deleteObserver​(Observer o)` | Deprecated. Deletes an observer from the set of observers of this object.