CODEWITHSUNDEEP
java
girish lalwani
girish lalwani

Reputation: 81

Java Q based on Packages

A UNIX user named Bob wants to replace his chess program with a new one, but he is not 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)


Answer is C but I want to know how it is ...........

Upvotes: 1

Views: 1264

Answers (1)

JB Nizet
JB Nizet

Reputation: 692023

The classpath is explicitely passed to the java command, so it supersedes the CLASSPATH environment variable. Answers B, D, E and F are thus incorrect.

A is incorrect since the class name is games.Chess. Since the package and the directory structures must match, the Chess.class file must be in a games folder (inside or outside a jar file).

C is correct.

G is incorrect because you can't pass *.jar to a classpath. And even if Games.jar was explicitely in the classpath, the manifest doesn't play any role here.

See http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html for the documentation about the classpath.

Upvotes: 6

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