单项选择题
System.out.format（”Pi is approximately %d.”， Math.PI）；
What is the result？（）
A. Compilation fails.
B. Pi is approximately 3.
C. Pi is approximately 3.141593.
D. An exception is thrown at runtime.
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单项选择题
11. String test = “Test A. Test B. Test C.”； 12. // insert code here 13. String[] result = test.split（regex）； Which regular expression inserted at line 12 will correctly split 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[ \.] +“； -
单项选择题
11. String test= “a1b2c3”； 12. String[] tokens = test.split（”\\d”）； 13. for（String s： tokens） System.out.print（s +“ “）； 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. -
单项选择题
11. String test = “This is a test”； 12. String[] tokens = test.split（”\s”）； 13. System.out.println（tokens.length）； What is the result？（）
A. 0
B. 1
C. 4
D. Compilation fails.
E. An exception is thrown at runtime.
