多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object？（）AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInputStream.DWhen you plan to reuse the StringBuffer to build more than one string.
多选题
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.
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