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 The process of converting the value of one data type (int, float, double, etc.) to another data type is known as typecasting. In Java, there are 13 types of type conversion. However, in this tutorial, we will only focus on the major 2 types. 1. Widening Type Casting 2. Narrowing Type Casting To learn about other types of type conversion, visit Java...
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