單項選擇題

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.

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單項選擇題

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？（）

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）

多項選擇題

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

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