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 Narrowing Casting (manual) - converting a larger type to a smaller type size double -> float ... Type casting is a technique that is used either by the compiler or a programmer to convert one data type to another in Java. Type casting is also known as type conversion. For example, converting int to double, double to int, short to int, etc.
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