Uses of Class
java.util.Observable

Packages that use Observable
java.util Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array). 
 

Uses of Observable in java.util
 

Methods in java.util with parameters of type Observable
 void Observer.update(Observable o, Object arg)
          This method is called whenever the observed object is changed.