Confused about Dan's exam...

[Attila Bak]

Suppose we have the following code (from Dan's exam)

  abstract class A {
  private int x = 4;
  private int y = 2;
  public int x() {return x;}
  public void x(int x) {this.x = x;}
  public int y() {return y;}
  public void y(int y) {this.y = y;}
}
interface B {int math();}
class C {
  static class D extends A implements B {
    public int math() {return x()+y();}
  }
  static A a1 = new A() implements B {
    public int math() {return x()+y();}
  };
  public static void main(String[] args) {
    System.out.print(new C.D().math());
    System.out.print(a1.math());
  }
} 

Why is class D considered anonymous class in this case?
An anonymous class cannot be static says another explanation in the same exam...
Can you help me on this?
thanx
attila

[Dan Chisholm]

In the above code example, the reference to the anonymous class is static; but the anonymous class is not static.
The reference, a1, is static so only one instance of the anonymous class will be created regardless of the number of instances of class C.

[Attila Bak]

Thanks Dan!
I understand now half of it:-)
Can you enlighten me further why is class D considered an anonymous class?
Thanks in advance!
attila

[Sarma Lolla]

class C {  static class D extends A implements B {    public int math() {return x()+y();}  }  static A a1 = new A() implements B {    public int math() {return x()+y();}  };  

In the above code class D is not anonymous. It is just a static inner class.
The problem is with the anonymous class referred by satic A a1.It can't use implements key word.