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Two Minute Drill

 
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Hi all,

I dint understand some points from 2minute drill please explain

Advanced Overloading (Objectives 1.5 and 5.4)
1 Primitive widening uses the "smallest" method argument possible.
2 Used individually, boxing and var-args are compatible with overloading.
3 You CANNOT widen from one wrapper type to another. (IS-A fails.)

Thanks in advance
 
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