What is the result？（） 
- A、The code will deadlock.
- B、The code may run with no output.
- C、An exception is thrown at runtime.
- D、The code may run with output "0 6".
- E、The code may run with output "2 0 6 4".
- F、The code may run with output "0 2 4 6".
正确答案:F
答案解析:有
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