A. An exception is thrown.
B. The code does not compile.
C. “Hello worlds.” Is printed to the terminal.
D. The program exits without printing anything.

A. public double methoda （）：
B. static void methoda（double d1） {}
C. public native double methoda （）：
D. abstract public foid methoda （）：
E. protected void methoda （double d1） {}

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；