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

A.1，2，3
B.Compilation fails because of an error in line 12.
C.Compilation fails because of an error in line 13.
D.Compilation fails because of an error in line 14.
E.A ClassCastException is thrown at runtime.

A.TestA
B.TestB
C.Compilation fails.
D.An exception is thrown at runtime.

A.Compilation succeeds.
B.Exactly one class does NOT compile.
C.Exactly two classes do NOT compile.
D.Exactly four classes do NOT compile.
E.Exactly three classes do NOT compile.

A.A
B.B
C.C
D.D
E.E

A.It can be any class.
B.No class has access to base.
C.The class must belong to the geometry package.
D.The class must be a subclass of the class Hypotenuse.

A.Compilation fails because of an error in line 3.
B.Compilation fails because of an error in line 7.
C.Compilation fails because of an error in line 9.
D.If you define D e = new E（），then e.bMethod（） invokes the version of bMethod（） defined in Line 5.
E.If you define D e = （D）（new E（）），then e.bMethod（） invokes the version of bMethod（） defined in Line 5.
F.If you define D e = （D）（new E（）），then e.bMethod（） invokes the version of bMethod（） defined in Line 9.

A.final
B.static
C.native
D.public
E.private
F.abstract
G.protected

A.1
B.2
C.3
D.4
E.5

A.double getSalesAmount（） { return 1230.45； }
B.public double getSalesAmount（） { return 1230.45； }
C.private double getSalesAmount（） { return 1230.45； }
D.protected double getSalesAmount（） { return 1230.45； }