单项选择题
What is the result？（）
A.0
B.1
C.4
D.Compilation fails.
E.An exception is thrown at runtime.
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多项选择题
WhichtwoscenariosareNOTsafetoreplaceaStringBufferobjectwithaStringBuilderobject？（）
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.
E.Enitiation of separate design processes to the separation of users -
单项选择题
The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14， 2000？（）
A.The value of s is 14-dic-2000.
B.The value of s is Dec 14， 2000.
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 13. -
单项选择题
What is the result？（）
A.int Long
B.Short Long
C.Compilation fails.
D.An exception is thrown at runtime.
