This is a JAVA realization of the observer design pattern. Also analyzed the JDK Swing/AWT part of the observer pattern implementation.

DesignPattern-Observer
......................\.classpath
......................\.project
......................\.settings
......................\.........\org.eclipse.jdt.core.prefs
......................\.........\org.maven.ide.eclipse.prefs
......................\pom.xml
......................\src
......................\...\main
......................\...\....\java
......................\...\....\....\edu
......................\...\....\....\...\xmu
......................\...\....\....\...\...\designPattern
......................\...\....\....\...\...\.............\DesignPattern_Observer
......................\...\....\....\...\...\.............\......................\AbstractObserver.java
......................\...\....\....\...\...\.............\......................\AbstractSubject.java
......................\...\....\....\...\...\.............\......................\ButtonTest.java
......................\...\....\....\...\...\.............\......................\ConcreteObserverOne.java
......................\...\....\....\...\...\.............\......................\ConcreteObserverTwo.java
......................\...\....\....\...\...\.............\......................\ConcreteSubject.java
......................\...\....\resources
......................\...\test
......................\...\....\java
......................\...\....\....\edu
......................\...\....\....\...\xmu
......................\...\....\....\...\...\designPattern
......................\...\....\....\...\...\.............\DesignPattern_Observer
......................\...\....\....\...\...\.............\......................\ObserverTest.java
......................\...\....\resources
......................\target
......................\......\DesignPattern-Iterator-0.0.1-SNAPSHOT.jar
......................\......\classes
......................\......\.......\edu
......................\......\.......\...\xmu
......................\......\.......\...\...\designPattern
......................\......\.......\...\...\.............\DesignPattern_Observer
......................\......\.......\...\...\.............\......................\AbstractObserver.class
......................\......\.......\...\...\.............\......................\AbstractSubject.class
......................\......\.......\...\...\.............\......................\ButtonHandler.class
......................\......\.......\...\...\.............\......................\ButtonHandler2.class
......................\......\.......\...\...\.............\......................\ButtonTest.class
......................\......\.......\...\...\.............\......................\ConcreteObserverOne.class
......................\......\.......\...\...\.............\......................\ConcreteObserverTwo.class
......................\......\.......\...\...\.............\......................\ConcreteSubject.class
......................\......\.......\...\...\.............\DesignPattern_Strategy
......................\......\maven-archiver
......................\......\..............\pom.properties
......................\......\surefire
......................\......\........\surefire2416181476891429391tmp
......................\......\........\surefire3260104848293817274tmp
......................\......\surefire-reports
......................\......\................\TEST-edu.xmu.designPattern.DesignPattern_Iterator.ArrayListTest.xml
......................\......\................\TEST-edu.xmu.designPattern.DesignPattern_Iterator.LinkedListTest.xml
......................\......\................\edu.xmu.designPattern.DesignPattern_Iterator.ArrayListTest.txt
......................\......\................\edu.xmu.designPattern.DesignPattern_Iterator.LinkedListTest.txt
......................\......\test-classes
......................\......\............\edu
......................\......\............\...\xmu
......................\......\............\...\...\designPattern
......................\......\............\...\...\.............\DesignPattern_Observer
.....................

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