CODEWITHSUNDEEP
javaclass
user1016403
user1016403

Reputation: 12621

overriding equals in superclass but not in subclass?

I have overridden equals() and hashCode() in my ClassA. 

ClassA {
   //overridden equals() and hashCode()
}

ClassB extends ClassA. 

ClassB extends ClassA{
   //....
}

Now if my code calls classBInstance.equals(classBInstanceTwo), does this call ClassA's equals method?

Thanks!

Upvotes: 0

Views: 163

Answers (2)

keiki
keiki

Reputation: 3459

Yes it does. But this can easily break the equals/hashcode contract (javadoc). For Example:

a equals b == b equals a

a equals b == a equals c == b equals c

So in the class B you shouldn't add new fields, which you want to use in equals/hashcode.

A possible solution is to use Class A as a field in Class B.

In the book Effective Java of Joshua Bloch there is a nice article about the problems with it.

Upvotes: 5

artplastika
artplastika

Reputation: 1982

Yes. All methods in Java are virtual by default.

Upvotes: 1

Related Questions