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Reference Variable Casting

 
Greenhorn
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I'm preparing for SCJP....while solving problems with the WhizLabs Exam Simulator.
Having problems with Reference Variable Casting!!!
Please provide some links so that I can clear the doubts....
Thanks!!!
 
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Look at the following tutorials

http://www.javabeginner.com/learn-java/java-object-typecasting (the site shows a very annoying add)
http://javaforyou.wordpress.com/2008/06/22/casting-reference-variables-downcasting-upcasting/
 
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