Java Platform 1.2

Uses of Class

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.

Java Platform 1.2

Submit a bug or feature Version 1.2 of Java Platform API Specification
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