If my class implements Serializable, do I have to implement it in its subclasses?

java serializable
ycomp picture ycomp · Feb 4, 2012 · Viewed 16k times · Source

If I have B extends A... and A implements Serializable, do I have to write "B implements Serializable" ?

I think no, but I would like confirmation...

also if I put serialization id in A... do I need to put one in B also ? should serialization id in A be protected (not private) ?

Answer

Azodious picture Azodious · Feb 4, 2012

Yes. Subclass need not be marked serializable explicitly.

And, marking id as protected will do (from compiler perspective).

But, as good practice every class should have it's own private serialVersionUID.

Related questions

What is a JavaBean exactly?

I understood, I think, that a "Bean" is a Java class with properties and getters/setters. As much as I understand, it is the equivalent of a C struct. Is that true? Also, is there a real syntactic difference between …

Read More
What does it mean: The serializable class does not declare a static final serialVersionUID field?

I have the warning message given in the title. I would like to understand and remove it. I found already some answers on this question but I do not understand these answers because of an overload with technical terms. Is …

Read More
What is the difference between Serializable and Externalizable in Java?

What is the difference between Serializable and Externalizable in Java?

Read More