多项选择题

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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：

Which command-line invocations will compile？（）

A.javac Mule.java
B.javac -source 1.3 Mule.java
C.javac -source 1.4 Mule.java
D.javac -source 1.5 Mule.java

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"）； }

单项选择题

Given：

What is the result？（）

A.An Exception is thrown with no other output
B.B, followed by an Exception.
C.Compilation fails due to an error on line 9.
D.Compilation fails due to an error on line 15.

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

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Click the Exhibit button

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