Java 1.7 Override of hashCode() not behaving as I would expect

Question

I have a class where I have overridden both the hashCode method as well as the equals method. The equals method behaves as I would expect it to, however the hashCode method

Answer 1

The problem is not with .hashCode(); the problem is that you don't override .equals()!

Look at your prototype:

public boolean equals(Car car)

Now have a look at the documentation for Object...

What you should override is:

public boolean equals(Object obj)

Hence the error. You did implement hashCode correctly, however you use Object's .equals() implementation.