多项选择题

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
F.java com.company.application.MainClass if run from the /apps/com/company/application directory

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单项选择题

Given the following directory structure：

And the following command line invocation：
javac –d classes source/Utils.java
Assume the current directory is bigProject， what it 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.

单项选择题

Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）

A.Alpha a=x；
B.Foo f=（Delta）x；
C.Foo f=（Alpha）x；
D.Beta b=（Beta）（Alpha）x；

单项选择题

What is the result？（）

A.Canada
B.null Canada
C.Canada null
D.Canada Canada
E.Compilation fails due to an error on line 26.
F.Compilation fails due to an error on line 29.