What&ensp;is&ensp;the&ensp;result？（）

单项选择题 What is the result？（）

A.test
B.null
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 1.
E.Compilation fails because of an error in line 4.
F.Compilation fails because of an error in line 5.

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1.单项选择题 Which code， inserted at line 14， allows the Sprite class to compile？（）

A.Direction d = NORTH；
B.Nav.Direction d = NORTH；
C.Direction d = Direction.NORTH；
D.Nav.Direction d = Nav.Direction.NORTH；

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2.单项选择题 Given a correctly compiled class whose source code is：

Assume that the class file is located in /foo/com/sun/sjcp/， the current directory is /foo/， and that the classpath contains "." （current directory）.
Which command line correctly runs Commander？（）

A.java Commander
B.java com.sun.sjcp.Commander
C.java com/sun/sjcp/Commander
D.java -cp com.sun.sjcp Commander
E.java -cp com/sun/sjcp Commander

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3.单项选择题A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command： java games.cards.Poker What allows the user to do this？（）

A.put Poker.jar in directory /stuff/java，and set the CLASSPATH to include /stuff/java
B.put Poker.jar in directory /stuff/java，and set the CLASSPATH to include /stuff/java/*.jar
C.Put Poker.jar in directory /stuff/java，and set the CLASSPATH to include /stuff/java/Poker.jar
D.put Poker.jar in directory /stuff/java/games/cards，and set the CLASSPATH to include /stuff/java
E.put Poker.jar in directory /stuff/java/games/cards，and set the CLASSPATH to include /stuff/java/*.jar
F.put Poker.jar in directory /stuff/java/games/cards，and set the CLASSPATH to include /stuff/java/Poker.jar

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4.单项选择题 What is the result？（）

A.s=14
B.s=16
C.s=10
D.Compilation fails.
E.An exception is thrown at runtime.

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5.多项选择题 What two must the programmer do to correct the compilation errors？（）

A.insert a call to this（） in the Car constructor
B.insert a call to this（） in the MeGo constructor
C.insert a call to super（） in the MeGo constructor
D.insert a call to super（vin） in the MeGo constructor
E.change the wheelCount variable in Car to protected
F.change line 3 in the MeGo class to super.wheelCount=3

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6.单项选择题A team of programmers is involved in reviewing a proposed design for a new utility class， After some discussion， they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself. What design issue has the team discovered？（）

A.Tight coupling
B.Low cohesion
C.High cohesion
D.Loose coupling
E.Weak encapsulation
F.Strong encapsulation

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7.多项选择题 What are four valid examples of polymorphic method calls？（）

A.x.a2（）；
B.z.a2（）；
C.z.c1（）；
D.z.a1（）；
E.y.c1（）；
F.x.a1（）；

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8.单项选择题 What is the result？（）

A.peep
B.bark
C.meow
D.Compilation fails.
E.An exception is thrown at runtime.

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9.单项选择题 What is the result？（）

A.Afoo，Afoo
B.Afoo，Bfoo
C.Bfoo，Afoo
D.Bfoo，Bfoo
E.Compilation fails.
F.An exception is thrown at runtime.

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10.多项选择题 Which three statements are true？（）

A.Compilation fails.
B.The code compiles and the output is 2.
C.If lines 16， 17 and 18 were removed， compilation would fail.
D.If lines 24， 25 and 26 were removed， compilation would fail.
E.If lines 16， 17 and 18 were removed， the code would compile and the output would be 2.
F.If lines 24， 25 and 26 were removed， the code would compile and the output would be 1.

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