【多选题】
1. class TestA { <br /> 2. TestB b； <br /> 3. TestA（） { <br /> 4. b = new TestB（this）； <br /> 5. } <br /> 6. } <br /> 7. class TestB { <br /> 8. TestA a； <br /> 9. TestB（TestA a） { <br /> 10. this.a = a； <br /> 11. } <br /> 12. } <br /> 13. class TestAll { <br /> 14. public static void main （String args[]） { <br /> 15. new TestAll（）.makeThings（）；<br /> 16. // ...code continues on <br /> 17. } <br /> 18. void makeThings（） { <br /> 19. TestA test = new TestA（）；<br /> 20. } <br /> 21. } <br /> Which two statements are true after 
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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