Consider the below code:

{% highlight java linenos %}

class MyWonderfulClass {

void go() {

Bar b = new Bar();

b.doStuff(new Foo() {

public void foof() {

System.out.println("foofy");

} // end foof method

}); // end inner class def, arg, and b.doStuff stmt.

} // end go()

}

interface Foo {

void foof();

}

class Bar {

void doStuff(Foo f) {

}

}

{% endhighlight %}

The `doStuff(Foo f)` in `Bar` class takes an object of a class that implements `Foo` interface. So, we just passed an

anonymous class which is an implementation of the `Foo` interface as an argument to the `doStuff()` method (in line 4).

This we call it as __Argument Defined Anonymous Class__.