A.Mr. John Doe
B.An exception is thrown at runtime.
C.Compilation fails because of an error in line 12.
D.Compilation fails because of an error in line 15.
E.Compilation fails because of an error in line 20.

A.Foo{public int bar（）{return 1；}}
B.new Foo{public int bar（）{return 1；}}
C.new Foo（）{public int bar（）{return 1；}}
D.new class Foo{public int bar（）{return 1；}}

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

A.12，4
B.The code runs with no output.
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 21.
E.Compilation fails because of an error in line 22.
F.Compilation fails because of an error in line 31.

A.0
B.1
C.2
D.3
E.4
F.6

A.import utils.*；
B.static import utils.*；
C.import utils.Repetition.*；
D.static import utils.Repetition.*；
E.import utils.Repetition.twice（）；
F.import static utils.Repetition.twice；
G.static import utils.Repetition.twice；

A.test
B.null
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 1.
E.Compilation fails because of an error in line 4.
F.Compilation fails because of an error in line 5.

A.Direction d = NORTH；
B.Nav.Direction d = NORTH；
C.Direction d = Direction.NORTH；
D.Nav.Direction d = Nav.Direction.NORTH；

A.java Commander
B.java com.sun.sjcp.Commander
C.java com/sun/sjcp/Commander
D.java -cp com.sun.sjcp Commander
E.java -cp com/sun/sjcp Commander

A.put Poker.jar in directory /stuff/java，and set the CLASSPATH to include /stuff/java
B.put Poker.jar in directory /stuff/java，and set the CLASSPATH to include /stuff/java/*.jar
C.Put Poker.jar in directory /stuff/java，and set the CLASSPATH to include /stuff/java/Poker.jar
D.put Poker.jar in directory /stuff/java/games/cards，and set the CLASSPATH to include /stuff/java
E.put Poker.jar in directory /stuff/java/games/cards，and set the CLASSPATH to include /stuff/java/*.jar
F.put Poker.jar in directory /stuff/java/games/cards，and set the CLASSPATH to include /stuff/java/Poker.jar

A.s=14
B.s=16
C.s=10
D.Compilation fails.
E.An exception is thrown at runtime.