When an object is passed to a method, the actual and formal parameters become aliases of each other.

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When an object is passed to a method in many programming languages, such as Java, the method receives a reference to the object. This means the actual parameter (the object passed in) and the formal parameter (the object received by the method) both refer to the same memory location, effectively making them aliases of each other. Changes to the object through the formal parameter will affect the original object.

When an Object Is Passed to a Method, the Actual