Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object？（）
- A、When using versions of Java technology earlier than 5.0.
- B、When sharing a StringBuffer among multiple threads.
- C、When using the java.io class StringBufferInputStream.
- D、When you plan to reuse the StringBuffer to build more than one string.
正确答案:A,B
答案解析:有
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