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Comments on Prevent anonymously subclassing

Post

Prevent anonymously subclassing

+3
−0

Is it possible to somehow prohibit anonymously subclassing of a specific class? For instance, with a plain public parent class:

public class Parent {

}

Extending this class should not be possible with an unnamed, anonymous subclass:

var myClass = new Parent() { ... }

However, all other forms of subclassing or usage should work, such as:

public class Child extends Parent {
    public static Object feelingLucky(boolean really) { 
        return really ? new Child() : new Parent();
    }
}
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1 comment thread

Sample use case? (3 comments)
Sample use case?
FractionalRadix‭ wrote 3 months ago

Out of curiosity, is there a use case for this? Your answer is clever, but I don't think a parent class should care if subclasses are anonymous.

Yes, I originally posted the answer on Stack Overflow. I don’t think it’s a great solution to the underlying issue there, though. I did consider posting a variation of that underlying issue here, but didn’t get that far yet.

https://stackoverflow.com/a/60123319/7395227

FractionalRadix‭ wrote 3 months ago

Ah, serialization! That makes sense. One should still wonder, if the subclass is anonymous, why one would need to serialize it in the first place. It's likely an X/Y problem, as you suggest in your comment. Still, I could imagine someone running into this situation.