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casting

 
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what is downcast and upcasting
what is use of it? and how importent in scjp 1.5?
 
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http://mindprod.com/jgloss/downcasting.html
http://mindprod.com/jgloss/upcasting.html

Quite important for exam.

Please try to find answers by yourself first, and only if you struggle post them here.
 
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