多項(xiàng)選擇題

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. } 
Which two statements are true after line 15, before main completes?()

A. Line 15 causes a stack overflow.
B. An exception is thrown at runtime.
C. The object referenced by a is eligible for garbage collection.
D. The object referenced by b is eligible for garbage collection.
E. The object referenced by a is not eligible for garbage collection.
F. The object referenced by b is not eligible for garbage collection.

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