1. class TestA { 
 2. TestB b; 
 3. TestA() { 
 4. b = new TestB(this); 
 5. } 
 6. } 
 7. class TestB { 
 8. TestA a; 
 9. TestB(TestA a) { 
 10. this.a = a; 
 11. } 
 12. } 
 13. class TestAll { 
 14. public static void main (String args[]) { 
 15. new TestAll().makeThings(); 
 16. // ...code continues on 
 17. } 
 18. void makeThings() { 
 19. TestA test = new TestA(); 
 20. } 
 21. }   

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