Question entretien chez EPAM Systems : Can you explain the difference between ConcurrentHashMap and Collections.synchronizedMap()? How does HashMap handle hash collisions internally in Java 8 vs Java 11? What happens if a superclass implements Serializable but the subclass does not? Will serialization work?

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Can you explain the difference between ConcurrentHashMap and Collections.synchronizedMap()? How does HashMap handle hash collisions internally in Java 8 vs Java 11? What happens if a superclass implements Serializable but the subclass does not? Will serialization work?

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