单项选择题

A.Compilation fails.B.Nothing is added to the file syst……

Given that the current directory is empty， and that the user has read and write privileges to the currentdirectory， and the following：

Which statement is true？（）

A.Compilation fails.
B.Nothing is added to the file system.
C.Only a new file is created on the file system.
D.Only a new directory is created on the file system.
E.Both a new file and a new directory are created on the file system.

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单项选择题Given： Which statement is true？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.Synchronizing the run（） method would make the class thread-safe.
D.The data in variable "x" are protected from concurrent access problems.
E.Declaring the doThings（） method as static would make the class thread-safe.

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

A.Foo.beta（） is a valid invocation of beta（）.
B.Foo.alpha（） is a valid invocation of alpha（）.
C.Method beta（） can directly call method alpha（）.
D.Method alpha（） can directly call method beta（）.

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 command line 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

单项选择题Given： What is the result？（）

A.w-f
B.f-p w-f
C.w-f b-f
D.f-p w-f b-f

单项选择题Click the Exhibit button. What is the output of the program shown in the exhibit？（）

A.300-100-100-100-100
B.300-300-100-100-100
C.300-300-300-100-100
D.300-300-300-300-100