For variables of reference types,you must check the class declaration to ensure that the type is serializable.

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Quizplus · Accepted Answer

This is because only serializable classes can be serialized and deserialized in Java. If a reference type is not serializable, it cannot be safely transferred over a network or saved to disk. Therefore, it is important to check that the class of a reference type is serializable before attempting to serialize it.

For Variables of Reference Types,you Must Check the Class Declaration