Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Uses of Interface java.util.Observer - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Edition

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Uses of Interface
java.util.Observer

Packages that use Observer
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 Observer in java.util

Methods in java.util with parameters of type Observer

void Observable.addObserver(Observer o)
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)
Deletes an observer from the set of observers of this object.