What is the result？（） 
- A、12，4
- B、The code runs with no output.
- C、An exception is thrown at runtime.
- D、Compilation fails because of an error in line 21.
- E、Compilation fails because of an error in line 22.
- F、Compilation fails because of an error in line 31.
正确答案:E
答案解析:有
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