单项选择题

What is the result？（）

A.The code runs with no output.
B.An exception is thrown at runtime.
C.Compilation fails because of an error in line 20.
D.Compilation fails because of an error in line 21.
E.Compilation fails because of an error in line 23.
F.Compilation fails because of an error in line 25.

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单项选择题What is the result？（）

A.3， 2， 1
B.1， 2， 3
C.Compilation fails.
D.The code runs with no output.
E.An exception is thrown at runtime.

单项选择题What is the result？（）

A.A,B,C
B.B,C,A
C.Compilation fails.
D.The code runs with no output
E.An exception is thrown at runtime.

单项选择题What inserted at line 39， will sort the keys in the props HashMap？（）

A.Arrays.sort（s）；
B.s = new TreeSet（s）；
C.Collections.sort（s）；
D.s = new SortedSet（s）；

单项选择题What is the result？（）

A.2，1，0
B.2，1，1
C.3，2，1
D.3，2，2
E.Compilation fails.
F.An exception is thrown at runtime.

单项选择题Given that the elements of a PriorityQueue are ordered according to natural ordering， and： What is the result？（）

A.apple pear
B.banana pear
C.apple apple
D.apple banana
E.banana banana