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in java, the `equals()` and `hashcode()` methods are crucial for object comparison and storage in collections like hashmap or hashset. the `equals()` method determines if two objects are considered equal, based on their content rather than their memory addresses. a proper implementation should ensure that if two objects are equal, they must have the same hash code.

the `hashcode()` method returns an integer representation of an object’s memory address, used for efficient data retrieval in hash-based collections. according to the contract, if two objects are equal (as determined by `equals()`), they must return the same hash code.

however, if the `hashcode()` method is overridden, the `equals()` method should also be overridden to maintain consistency. failing to adhere to these principles can lead to issues such as unexpected behavior in collections, making it essential for developers to understand and implement these methods correctly during java interviews.
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