File list (Check if you may need any files):
ObserverExample
...............\.idea
...............\.....\.name
...............\.....\compiler.xml
...............\.....\copyright
...............\.....\.........\profiles_settings.xml
...............\.....\encodings.xml
...............\.....\misc.xml
...............\.....\modules.xml
...............\.....\workspace.xml
...............\ObserverExample.iml
...............\out
...............\...\production
...............\...\..........\ObserverExample
...............\...\..........\...............\Example$1.class
...............\...\..........\...............\Example.class
...............\...\..........\...............\RandomNumberGenerator.class
...............\...\..........\...............\RandomNumberListener.class
...............\...\..........\...............\RandomNumberListenerImpl.class
...............\src
...............\...\Example.java
...............\...\RandomNumberGenerator.java
...............\...\RandomNumberListener.java
...............\...\RandomNumberListenerImpl.java
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