If a class has fields that are objects of other classes, those classes do not need to implement the Serializable interface to be serialized.

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Quizplus · Accepted Answer

For a class to be serializable, all of its fields must be serializable unless marked as transient. If a class has fields that are objects of other classes, those classes must also implement the Serializable interface for the parent class to be properly serialized.

If a Class Has Fields That Are Objects of Other