多项选择题

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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Click the Exhibit button. What is the result? （）

A.Value is: 8
B.Compilation fails.
C.Value is: 12
D.Value is: -12
E.The code runs with no output.
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Given:

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