RFR(s): 8060192: Add default method Collection.toArray(generator)

Stuart Marks stuart.marks at oracle.com
Fri Dec 8 00:47:03 UTC 2017

On 12/7/17 3:50 PM, Jonathan Bluett-Duncan wrote:

> Looking over 
> http://cr.openjdk.java.net/~smarks/reviews/8060192/webrev.2/src/java.base/share/classes/java/util/ArrayList.java.cdiff.html, 
> I'm wondering if the method `ArrayList.toArray(IntFunction)` should have an 
> `@Override` to make it clear that it's overriding the default method in 
> Collection. What do you think?

I guess it wouldn't hurt. I had thought about adding it, but most of the methods 
in ArrayList that override implementations from supertypes *don't* have 
@Override. Looking more closely, it appears that the ones that override 
interface default methods *do* have @Override.

I don't think there's a rule that says that @Override should be used when 
overriding interface default methods but not when overriding implementations 
from a superclass or when implementing an abstract interface method. Frankly, I 
think the JDK is just sloppy here. Most of the existing implementations didn't 
use @Override -- possibly because they were introduced before annotations 
existed -- and later on, whoever implemented the overrides of the Java 8 default 
methods decided to add @Override.


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