why find the problem when i try to run this code which is in d:\world directory and my package name is world
the problem is given below
C:\Documents and Settings\Administrator>D:
D:\>CD world
D:\world>set CLASSPATH=.;d:;
D:\world>javac HelloWorld.java
D:\world>
java world.HelloWorld
Error: Could not find or load main class world.HelloWorld
my java code is given below