Java - Anonymous Inner Class (ActionListener, Runnable)

http://blog.naver.com/euro87?Redirect=Log&logNo=120184592615
// Anonymous Inner Class => No need for the object of class
// Need for ActionListener, Runnable interface

public class A{
    int x;
    public void test(){
        //...
    }
}

A a = new A(){                     // No need for the object of class
           public void test(){
               // ...              // ----> Overriding
           }
       };