What difficulties can arise when overriding the hashCode method if it always returns one?

If the hashCode method always returns the same value, for example 1, it causes all objects to be placed in the same bucket in hash tables such as HashMap or HashSet. As a result:

• The performance of insert, search, and delete operations sharply decreases from the expected average time of O(1) to O(n), since all elements in one bucket must be sequentially traversed.
• The purpose of hashing is violated, as the hash function does not distribute objects across buckets.
• This can lead to increased program response time and higher resource consumption.

Example of poor overriding:

@Override
public int hashCode() {
    return 1; // always the same value
}

A correct override should consider the fields of the object involved in the equals comparison to ensure good distribution of hash codes.