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？（）

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

单项选择题Given： 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

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 Bookclass？（）

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 - classpath /foo/myLib.jar Book.java

单项选择题Given： What is the result？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The attribute id in the ItemTest object remains unchanged.
D.The attribute id in the ItemTest object is modified to the new value.
E.A new ItemTest object is created with the preferred value in the id attribute.