Creating a circular reference between two objects in Java

DRMacIver (David R. MacIver) — Wed, 22 Aug 2007 22:03:41 GMT

This is in some sense the 'right' way of doing it as far as I can figure. Nothing else I've been able to come up with works even close to as well.



public class LazyModules 

{

  static int i = 0;



  static abstract class A{

    abstract B getB();

    int k = i++;

    public String toString() { return "" + k; }

  }



  static abstract class B{

    abstract A getA();

    int k = i++;

    public String toString() { return "" + k; }

  }



  public static void doStuff(A foo, B bar){

    System.out.println("foo = " + foo);

    System.out.println("foo.b = " + foo.getB());

    System.out.println("bar = " + bar);

    System.out.println("bar.a = " + bar.getA()); 

  }



  public static void main(String[] args){

    new Object(){

      final A foo = new A() { B getB() { return bar; }  };

      final B bar = new B() { A getA() { return foo; }  };



      { doStuff(foo, bar); }

    };

  }

}

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Creating a circular reference between two objects in Java