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 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 
Bob‟s 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？（）