Problems for Note on

i downloaded some source example code to run on my machine , but thecode is based on java virsion is 1.4, my machine is java 5.0, and when i compile the code, the Note on "unchecked or unsafe operation" Warnings comes out. i've try to add the type of arrayList and hashMaps(the main data structure the code used)as the author said in his book, but the notes warning still come out...help me please...

Cross post:
http://forum.java.sun.com/thread.jspa?threadID=788428&messageID=4480243#4480243

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