Web Reference: Nov 12, 2025 · Upcasting is the process of casting a subtype to a supertype in the inheritance tree's upward direction. When a sub-class object is referenced by a superclass reference variable, an automatic process is triggered without any further effort. Java Type Casting Type casting means converting one data type into another. For example, turning an int into a double. In Java, there are two main types of casting: Widening Casting (automatic) - converting a smaller type to a larger type size byte -> short -> char -> int -> long -> float -> double You can convert the type of a value through casting. Casting Conversions converts the type of an expression to the type specified. It is done by placing the desired type in parenthesis prior to the expression. In the case of wanting one or both of the operands to be a double, we can cast to a double as follows:
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