What consequences may arise if two objects have the same hash value?

If two objects have the same hash value (hash collision), it can lead to the following consequences:

• In collections based on hash tables (e.g., HashSet, HashMap), objects with the same hash will fall into the same bucket, which reduces the efficiency of search and insert operations.

• If the equals() methods are not implemented correctly, the collection may incorrectly determine that objects are different, allowing duplicates, or conversely, consider different objects as the same.

• Overall, hash collisions do not violate the correctness of operation but degrade performance.

Therefore, it is important that the hashCode() method is well-distributed, and equals() and hashCode() are consistent.