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单项选择题 Given：

What is the result？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.doStuff x = 6 main x = 6
D.doStuff x = 5 main x = 5
E.doStuff x = 5 main x = 6

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你可能感兴趣的试题

1.单项选择题 Given：

and two separate command line invocations：
java Yippee
java Yippee 1 2 3 4
What is the result？（）

A.No output is produced.1 2 3
B.No output is produced.2 3 4
C.No output is produced.1 2 3 4
D.An exception is thrown at runtime.1 2 3

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2.单项选择题 Given：

What is the result？（）

A.81
B.82
C.91
D.92

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3.单项选择题Which statement is true？（）

A.A class’s finalize（） method CANNOT be invoked explicitly.
B.super.finalize（） is called implicitly by any overriding finalize（） method.
C.The finalize（） method for a given object is called no more than once by the garbage collector.
D.The order in which finalize（） is called on two objects is based on the order in which the two objects became finalizable.

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4.多项选择题 Given：

And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH
environment variable is set to "." （current directory）.
Which two java commands entered at the commandline will run MainClass？（）

A.java MainClass if run from the /apps directory
B.java com.company.application.MainClass if run from the /apps directory
C.java -classpath /apps com.company.application.MainClass if run from any directory
D.java -classpath . MainClass if run from the /apps/com/company/application directory
E.java -classpath /apps/com/company/application：. MainClass if run from the /apps directory

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5.单项选择题 Given the following directory structure：
bigProject
|--source
||--Utils.java|
|--classes
|--
And the following command line invocation：
javac -d classes source/Utils.java
Assume the current directory is bigProject，what is the result？（）

A.If the compile is successful， Utils.class is added to the source directory.
B.The compiler returns an invalid flag error.
C.If the compile is successful， Utils.class is added to the classes directory.
D.If the compile is successful， Utils.class is added to the bigProject directory.

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6.单项选择题 A UNIX user named Bob wants to replace his chess program with a new one， but he is not sure where theold one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command：
java -classpath /test：/home/bob/downloads/*.jar games.Chess
Bob’s CLASSPATH is set （at login time） to：
/usr/lib：/home/bob/classes：/opt/java/lib：/opt/java/lib/*.jar
What is a possible location for the Chess.class file？（）

A./test/Chess.class
B./home/bob/Chess.class
C./test/games/Chess.class
D./usr/lib/games/Chess.class
E./home/bob/games/Chess.class

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7.单项选择题 Given a class Repetition：

Which code should be inserted at line 1 of Demo.java to compile and run Demo to print "pizzapizza"？（）

A.import utils.*；
B.static import utils.*；
C.import utils.Repetition.*；
D.static import utils.Repetition.*；
E.import utils.Repetition.twice（）；
F.import static utils.Repetition.twice；

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8.单项选择题 Given：

What is the result？（）

A.Compilation fails due to an error in line 23.
B.Compilation fails due to an error in line 29.
C.A ClassCastException occurs in line 29.
D.A ClassCastException occurs in line 31.
E.The value of all four objects prints in natural order.

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9.多项选择题 Given a pre-generics implementation of a method：

What three changes allow the class to be used with generics and avoid an unchecked warning？（）

A.Remove line 14.
B.Replace line 14 with "int i = iter.next（）；".
C.Replace line 13 with "for （int i ： intList） {".
D.Replace line 13 with "for （Iterator iter ： intList） {".
E.Replace the method declaration with "sum（List intList）".

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10.单项选择题 Given：

Which method will complete this class？（）

A.public int compareTo（Object o）{/*more code here*/}
B.public int compareTo（Score other）{/*more code here*/}
C.public int compare（Score s1，Score s2）{/*more code here*/}
D.public int compare（Object o1，Object o2）{/*more code here*/}

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