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單項選擇題

10. public class ClassA { 
11. public void count(int i) { 
12. count(++i); 
13. } 
14. } 
And: 
20. ClassA a = new ClassA(); 
21. a.count(3); 
Which exception or error should be thrown by the virtual machine?() 

A. StackOverflowError
B. NullPointerException
C. NumberFormatException
D. IllegalArgumentException
E. ExceptionlnlnitializerError

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