What&ensp;is&ensp;the&ensp;result？（）

单项选择题 What is the result？（）

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.

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1.单项选择题 What is the result？（）

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.

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2.多项选择题 Which two statements are true about The result if the default locale is Locale.US？（）

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.

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3.单项选择题 What is the result when method testIfA is invoked？（）

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.

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4.单项选择题 Which regular expression， inserted at line 12， correctly splits test into "Test A"， "Test B"， and "Test C"？（）

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

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5.单项选择题 What is the result？（）

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

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6.单项选择题 Which code fragment， inserted at line 23， allows the code to compile？（）

A.df = new DateFormat（）；
B.df = Date.getFormat（）；
C.df = date.getFormat（）；
D.df = DateFormat.getFormat（）；
E.df = DateFormat.getInstance（）；

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7.单项选择题 Given：
1.d is a valid， non-null Date object
2.df is a valid， non-null DateFormat object set to the current locale
What outputs the current locale’s country name and the appropriate version of d’s date？（）

A.Locale loc = Locale.getLocale（）； System.out.println（loc.getDisplayCountry（）+ " " + df.format（d））；
B.Locale loc = Locale.getDefault（）； System.out.println（loc.getDisplayCountry（）+ " " + df.format（d））；
C.Locale loc = Locale.getLocale（）；System.out.println（loc.getDisplayCountry（）+ " " + df.setDateFormat（d））；
D. Locale loc = Locale.getDefault（）；System.out.println（loc.getDisplayCountry（）+ " " + df.setDateFormat（d））；

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8.多项选择题 Which two code fragments， inserted independently at line 3， generate the output 4247？（）

A. String s = "123456789"； s = （s - "123"）.replace（1， 3， "24"） - "89"；
B. StringBuffer s = new StringBuffer（"123456789"）；s.delete（0， 3）.replace（1， 3， "24"）.delete（4， 6）；
C. StringBuffer s = new StringBuffer（"123456789"）； s.substring（3， 6）.delete（1，3）.insert（1， "24"）；
D. StringBuilder s = new StringBuilder（"123456789"）；s.substring（3， 6）.delete（1， 2）.insert（1， "24"）；
E. StringBuilder s = new StringBuilder（"123456789"）； s.delete（0， 3）.delete（1， 3）.delete（2， 5）.insert（1， "24"）；

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9.单项选择题 What is the result？（）

A.three
B.other
C.An exception is thrown at runtime.
D.Compilation fails because of an error on line 12.
E.Compilation fails because of an error on line 13.
F.Compilation fails because of an error on line 15.

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10.单项选择题 What is the result？（）

A.The value "4" is printed at the command line.
B.Compilation fails because of an error in line 5.
C.Compilation fails because of an error in line 9.
D.A NullPointerException occurs at runtime.
E.A NumberFormatException occurs at runtime.
F.An IllegalStateException occurs at runtime.

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