A. The code compiles and “s=” is printed.
B. The code compiles and “s=” + s）；
C. The code does not compile because Strings is not initialized.
D. The code does not compile because Strings cannot be referneed.
E. The code comiles， but a NullPointer Exception is thrown when toString is called.

A. run
B. import
C. default
D. implement

A. foo has the value of “”
B. foo hast he falue of null.
C. foo has the value of “blue”
D. foo has the value of “green”
E. An exception is thrown.
F. The code will not compile.

A. The program runs and prints nothing.
B. The program runs and prints “Equal”.
C. An error at line 5 cause compilation to fail.
D. The program runs but aborts with an exception.

A. The program runs and prints “0”
B. The program runs and prints “1”
C. The program runs but aborts with an exception.
D. An error “possible undefined variable” at line 4 causes compilation to fail.
E. An error “possible undefined variable” at line 9 cause compilation to fail.

A. 2
B. 4
C. 8
D. 16
E. The code will not compile.

A. public interface Person {}  Public class Employee extends Person {}
B. public interface Shape {}  public interface Rectangle extends Shape {}
C. public interface Color {}  public class Shape { private Color color； }
D. public class Species {}  public class Animal { private Species species； }
E. interface Component {} Class Container implements Component {private Component [] children；

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

A. An anonymous class can be declared as static.
B. A static inner class cannot be a static member of the outer class.
C. A static inner class does not require an instance of the enclosing class.
D. Instance member of a static inner class can be referenced using the class name of the staticinner class.