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. }

package testApp;

 class TestApp {
 TestB b;
 TestApp() {
 b = new TestB(this);
 System.out.println("Object A Init ed.");
 }
 protected void finalize(){
   System.out.println("DELETING Object A...");
 }
 }
 class TestB {
 TestApp a;
 TestB(TestApp a) {
 this.a = a;
 System.out.println("Object B Init ed.");
 }
 protected void finalize(){
   System.out.println("DELETING Object B...");
 }
 }
 class TestAll {
 public static void main (String args[]) {
 new TestAll().makeThings();
 System.out.println("Calling System.gc()...");
 System.gc();
 for(;;
 }
 void makeThings() {
 TestApp test = new TestApp();
 }
}