How does java implement inner class closures?

Posted by thecoop on Stack Overflow See other posts from Stack Overflow or by thecoop
Published on 2010-05-10T17:34:30Z Indexed on 2010/05/10 17:44 UTC
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In Java an anonymous inner class can refer to variables in it's local scope:

public class A {
    public void method() {
        final int i = 0;

        doStuff(new Action() {
            public void doAction() {
                Console.printf(i);   // or whatever
            }
        });
    }
}

My question is how is this actually implemented? How does i get to the anonymous inner doAction implementation, and why does it have to be final?

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