Have you ever overridden the hashCode method in your code?

Yes, overriding the hashCode method in Java is a common practice, especially when overriding the equals method. It is necessary for the correct functioning of objects in hash-based collections such as HashMap or HashSet.

Rules for overriding hashCode:

• If two objects are equal according to equals, then their hashCode must be the same.
• A good implementation should distribute hashes evenly to reduce collisions.

Example of overriding hashCode and equals:

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    MyClass myClass = (MyClass) o;
    return Objects.equals(field1, myClass.field1) &&
           Objects.equals(field2, myClass.field2);
}

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

Using Objects.hash simplifies creating a hash code based on the object's fields.