单项选择题
11. public static void test（String str） {
12. if（str == null | str.lellgth（） == 0） {
13. System.out.println（”String is empty”）；
14. } else {
15. System.out.println（”String is not empty”）；
16. }
17. }
And the invocation：
31. test（llull）；
What is the result？（）
A. Au exception is thrown at runtime.
B. “String is empty” is printed to output.
C. Compilation fails because of au error in line 12.
D. “String is not empty” is printed to output.
相关考题
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单项选择题
A UNIX user named Bob wants to replace his chess program with a new one， but he is hot sure where the old one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command： java -classpath /test：/home/bob/downloads/* .jar games.Chess Bobs CLASSPATH is set （at login time） to： /usr/lib：/home/bob/classes：/opt/java/lib：/opt/java/lib/* .jar What is a possible location for the Chess.class file？（）
A. /test/Chess.class
B. /home/bob/Chess.class
C. /test/games/Chess.class
D. /usr/lib/games/Chess.class
E. /home/bob/games/Chess.class
F. inside jarfile /opt/java/lib/Games.jar （with a correct manifest）
G. inside jarfile /home/bob/downloads/Games.jar （with a correct manifest） -
多项选择题
package com.company.application； public class MainClass { public static void main（String[] args） { } } 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 -
单项选择题
Given the fully-qualified class names： com.foo.bar.Dog com.foo.bar.blatz.Book com.bar.Car com.bar.blatz.Sun Which graph represents the correct directory structure for a JAR file from which those classes can be used by the compiler and JYM？（）
A. Jar A
B. Jar B
C. Jar C
D. Jar D
E. Jar E
