by, 01-08-2012 at 11:50 AM (1735 Views)
When you treat a variable of one type to another type, it is called type casting. Up casting supports automatic conversion but in case of low casting you need to explicitly specify it.
In case of objects, you can cast a subclass object into a superclass.Java Code: Type Castingbyte -> short -> int -> long -> float -> double int i = 5; long j = i; //Right. Up casting or implicit casting byte b1 = i; //Wrong. Compile time error “Type Mismatch”. byte b2 = (byte) i ; //Right. Down casting or explicit casting is required.
Upcasting vs Downcasting