A UNIX user named Bob wants to replace...

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'sCLASSPATH 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
F.inside jarfile /opt/java/lib/Games.jar (with a correct manifest)
G. inside jarfile /home/bob/downloads/Games.jar (with a correct manifest)

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1.单项选择题 Given classes defined in two different files:

What is required at line 5 in class SomeApp to use the process method of BitUtils?（）

A.process(bytes);
B.BitUtils.process(bytes);
C.app.BitUtils.process(bytes);
D.util.BitUtils.process(bytes);
E.import util.BitUtils.*; process(bytes);
F.SomeApp cannot use the process method in BitUtils.

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2.单项选择题 Given:

What is the result?（）

A.81
B.82
C.91
D.92
E.Compilation fails.
F.An exception is thrown at runtime.

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3.多项选择题A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class?（）

A. The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
B. The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..
C. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.
D. The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.
E. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java.
F. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.java
G. The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java

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4.单项选择题 Given classes defined in two different files:What is required at line 5 in class SomeApp to use the process method of BitUtils?（）

A. process(bytes);
B. BitUtils.process(bytes);
C. util.BitUtils.process(bytes);
D. SomeApp cannot use methods in BitUtils.
E. import util.BitUtils.*; process(bytes);

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5.多项选择题Which two statements are true?（）

A.It is possible for more than two threads to deadlock at once.
B.The JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
C.Deadlocked threads release once their sleep() method's sleep duration has expired.
D.Deadlocking can occur only when the wait(), notify(), and notifyAll() methods are used incorrectly.
E.It is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
F.If a piece of code is capable of deadlocking, you cannot eliminate the possibility of deadlocking by inserting invocations of Thread.yield().

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6.单项选择题 Given:

What is the result?（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes normally and prints "foo".
D.The code executes normally, but nothing is printed.

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7.单项选择题 Given:

What is the result?（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes normally and prints "sleep".
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8.单项选择题 Given:

Which is true?（）

A.If line 10 is removed, the compilation succeeds.
B.If line 11 is removed, the compilation succeeds.
C.If line 12 is removed, the compilation succeeds.
D.If line 13 is removed, the compilation succeeds.
E.More than one line must be removed for compilation to succeed.

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9.单项选择题 Given:

Which statement is true?（）

A.420 is the output.
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C.All constructors must be declared public.
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A.Looser coupling
B.Tighter coupling
C.Lower cohesion
D.Higher cohesion
E.Weaker encapsulation
F.Stronger encapsulation

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