单项选择题
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.
单项选择题 System.out.format（”Pi is approximately %d.”， Math.PI）； What is the result？（）
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”？（）
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？（）