Which design pattern is not implemented in Java language?

Hi,

In an interview I was asked that out of 23 design patterns, which one is not implemented in Java Language?

Any one have idea?

Regards,
Amit

Well, what were the 23 design patterns?

You can program anything in Java, including any design pattern that you can come up with. The question is a bit strange.

In my opinion, the best thing about design patterns is the common language -- by documenting common patterns, and giving them names, it help developers easily communicate. For example, when I say iterate, I am referring the iterate design pattern, and many developers knows exactly (or mostly) what I am talking about.

<rant>

In my opinion, the worst thing about design patterns, as with all things, elitism. While I don't mind the many new patterns being documented, I really hate the usage of the names, with the expectation that you are expected to know it. I really hate the expectation that you are expected to know a subtle detail, about something that is supposed to describe a "pattern".

Many of these "design pattern experts" may know their patterns, but they seem to have forgotten about what makes them popular.

</rant>

Henry