Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?（）<br>A:When using versions of Java technology earlier than 5.0.<br>B:When sharing a StringBuffer among multiple threads.<br>C:When using the java.io class StringBufferInputStream.<br>D:When you plan to reuse the StringBuffer to build more than one string.

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.

出自：Oracle认证

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