UML to Java question

I have a UML that I have to convert to Java code. The only thing I cannot figure out is how to call method op2() in class B from classes C and D. If I create an object of class B, then the whole program goes into an infinite loop. And I cannot even make the method op2() a class method. Can anyone tell me where I need to correct the code?

http://img512.imageshack.us/img512/408/17721211.jpg

Code:

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public class B extends A {
  public static void main(String args[]) {
    new B();
  }
  private C c;
  private D d;
  public B() {
    System.out.println("B()");
    c = new C(this);    // 1:
    d = new D(this);    // 2:
    c.op3(d);            // 3:
    d.op4(c);            // 4:
  }
  public void op2() {
    System.out.println("B.op2()");
    op1();              // 3.1.1.1:  and  4.1.1.1:
  }

}

class A{
    public void op1() {
        System.out.println("A.op1()");
        }
}


class C {
        private B b;
        private D d;
        public C(B b) {
        System.out.println("C()");
        }

        public void op3(D d) {
        System.out.println("C.op3()");
        d.op5();
        }

        public void op5() {
        System.out.println("C.op5()");
        b.op2(); //erroneous part
        }
}

class D {
        private B b;
        private C c;
        public D(B b) {
        System.out.println("D()");
        }

        public void op4(C c) {
        System.out.println("D.op4()");
        c.op5();
        }

        public void op5() {
        System.out.println("D.op5()");
        b.op2();  //erroneous part
        }
}

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Hello,
What exactly are you trying to do in your classes. The op2() method is in class B. So, if you need to use this method in class C and class D then you will need to extend class C and class D with class B. I think this is the solution for it. Also, if you need some other way round then you can also you class B as an interface so that it can be called by class C and class D at the same time, that is multiple inheritance.