File list (Check if you may need any files):
ObserverDemo
............\.classpath
............\.project
............\bin
............\...\demo
............\...\....\Jerry.class
............\...\....\Nanfang.class
............\...\....\Newspace.class
............\...\....\Reader.class
............\...\....\Test.class
............\...\....\Tom.class
............\src
............\...\demo
............\...\....\Jerry.java
............\...\....\Nanfang.java
............\...\....\Newspace.java
............\...\....\Reader.java
............\...\....\Test.java
............\...\....\Tom.java
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