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Ans. Deserialization. In serialization, we can save the object of a byte stream into a file or send over a network. Suppose if you serialize the Singleton class, and then again de-serialize that object, it will create a new instance, hence deserialization will break the Singleton pattern.
To overcome this issue, we need to override readResolve() method in the Singleton class and return the same Singleton instance.
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