Using protected instance variables can cause derived-class methods to be written to depend on base-class implementation.

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Quizplus · Accepted Answer

Protected instance variables are accessible to derived classes, which means that derived-class methods can directly access and depend on these variables. This can lead to a situation where the derived-class methods are tightly coupled to the base-class implementation, making the code difficult to maintain or modify. Therefore, it is recommended to use private instance variables with public getters and setters instead of protected instance variables.

Using Protected Instance Variables Can Cause Derived-Class Methods to Be