How is the hashCode value generated for an object in Java?

In Java, the hashCode() method returns an integer value that serves as the hash code of the object. By default, if the method is not overridden, hashCode() is generated based on the internal address of the object in memory (or another unique identifier).

When overriding hashCode(), it is common to use the object's fields that influence its equality to ensure that equal objects have the same hash code. For example:

@Override
public int hashCode() {
    return Objects.hash(field1, field2);
}

The generation of hashCode should be fast and distribute values evenly to minimize collisions in hash tables.