Module java.base
Package java.util

Interface Observer

@Deprecated(since="9")public interfaceObserver
Deprecated.
This interface has been deprecated. See theObservable class for further information.
A class can implement theObserver interface when it wants to be informed of changes in observable objects.
Since:
1.0
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    Deprecated.
    This method is called whenever the observed object is changed.

  • Method Details

    • update

      void update(Observable o,Object arg)
      Deprecated.
      This method is called whenever the observed object is changed. An application calls anObservable object'snotifyObservers method to have all the object's observers notified of the change.
      Parameters:
      o - the observable object.
      arg - an argument passed to thenotifyObservers method.