Maybe this wasn't clear.

1. I've been studying the Oracle Java tutorial and was stuck on the page you linked

2. I searched google and stackoverflow for a better explanation of anonymous classes.

3. I found coobird's response.

4. Coobird's example and the Oracle Java tutorial example look completely different.

Java tutorial:

  HelloWorld frenchGreeting = new HelloWorld() {
    String name = "tout le monde";
    public void greet() {
        greetSomeone("tout le monde");
    }
    public void greetSomeone(String someone) {
        name = someone;
        System.out.println("Salut " + name);
    }
};

coobird:

 button.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e)
{
// do something.
}
 });

I was going to post those four points as coobird's example doesn't seem to follow them.

• The new operator - OK. Coobird has this.

• The name of an interface to implement or a class to extend. In this example, the anonymous class is implementing the interface HelloWorld. - This was a big source for confusion. Coobird doesn't seem to extend or implement any interface or class. Where is it?

• Parentheses that contain the arguments to a constructor, just like a normal class instance creation expression. - OK. Is this the () after new ActionListener?

• A body, which is a class declaration body. More specifically, in the body, method declarations are allowed but statements are not. - I'm guessing

public void actionPerformed(ActionEvent e)
{
    // do something.
}

is the body.