多项选择题

Which two statements are true if a NullPointerException……

Which two statements are true if a NullPointerException is thrown on line 3 of class C？（）

A.The application will crash.
B.The code on line 29 will be executed.
C.The code on line 5 of class A will execute.
D.The code on line 5 of class B will execute.
E.The exception will be propagated back to line 27.

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单项选择题Given a method that must ensure that its parameter is not null： What， inserted at line 12， is the appropriate way to handle a null value？（）

A.assert value == null；
B.assert value != null ： "value is null"；
C.if （value == null）{ throw new AssertionException（"value is null"）； }
D.if （value == null）{ throw new IllegalArgumentException（"value is null"）； }

多项选择题Which two code fragments are most likely to cause a StackOverflowError？（）

A.A
B.B
C.C
D.D
E.E
F.F

单项选择题What is the result？（）

A.X， followed by an Exception.
B.No output， and an Exception is thrown.
C.Compilation fails due to an error on line 14.
D.Compilation fails due to an error on line 16.
E.Compilation fails due to an error on line 17.
F.X， followed by an Exception， followed by B

单项选择题What is the result？（）

A.test
B.Exception
C.Compilation fails.
D.NullPointerException

单项选择题Which statement is true if a ResourceException is thrown on line 86？（）

A.Line 92 will not execute.
B.The connection will not be retrieved in line 85.
C.The resource connection will not be closed on line 88.
D.The enclosing method will throw an exception to its caller.