A.0
B.1
C.4
D.Compilation fails.
E.An exception is thrown at runtime.

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

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.

A.int Long
B.Short Long
C.Compilation fails.
D.An exception is thrown at runtime.

A.35. DateFormat df = DateFormat.getDateFormat（）；42. d.setTime（（60 * 60 * 24） + d.getTime（）；
B.35. DateFormat df = DateFormat.getDateInstance（）；42. d.setTime（（1000 * 60 * 60 * 24） +d.getTime（））；
C.35. DateFormat df = DateFormat.getDateFormat（）；42. d.setLocalTime（（1000 * 60 * 60 * 24） +d.getLocalTime（））；
D.35. DateFormat df = DateFormat.getDateInstance（）； 42. d.setLocalTime（（60 * 60 * 24） +d.getLocalTime（））；

A.a，b，c
B.1，2，3
C.a1b2c3
D.a1 b2 c3
E.Compilation fails.
F.The code runs with no output.
G.An exception is thrown at runtime.

A.Compilation fails.
B.After line 15， the value of age is 5.
C.After line 15， the value of age is 3.
D.An exception is thrown at runtime.

A.The value of b is 2.
B.The value of a is 3.14.
C.The value of b is 2.00.
D.The value of a is 3.141.
E.The value of a is 3.1415.
F.The value of a is 3.1416.
G.The value of b is 2.0000.

A.True
B.Not true
C.An exception is thrown at runtime.
D.Compilation fails because of an error at line 12.
E.Compilation fails because of an error at line 19.

A.String regex = ""；
B.String regex = " "；
C.String regex = ".*"；
D.String regex = "\\s"；
E.String regex = "\\.\\s*"；
F.String regex = "\\w[\.] +"；

A.7
B.49
C.343
D.Compilation fails.
E.An exception is thrown at runtime.