Class access control

Question

I'm new to Java and have just started experimenting with Packages and importing classes from my own files. I keep getting the following error messages: cannot resolve symbol and package <my package name> does not exist and class file contains wrong class:<myclass name and path> Please remove or make sure it appears in the correct subdirectory of the classpath.
These class importing problems only occur when I specifically define the package and/or when I explicitly import one of my user classes.
I am using 2 simple classes to test this
//package myjava.practicePack; Commented out the offending line
class test {
     test() {
          System.out.println("Seems to work?@%$#^");
} // This class is found in C:\myjava\practicePack
and also
//package myjava.practicePack;
//import myjava.practicePack.test; // more offensive code
class testCase {
     public static void main(String[] args) {
          test A = new test();
} // testCase is in the same folder as test.class and I have also tried it in a subfolder of \practicePack and also just in \myjava (while test.class is in myjava\practicePack
Everything works fine when I don't use the package declaration on both/either classes or import the test.class into testCase
I'm using windows XP (I know I'm sorry too) and java 1.4.0_01.
My classpath is set to .;C:\myjava;C:\myjava\practicePack and echo %classpath% confirms this.
Can anyone tell me where my problem is?

Answer 1

The directory tree in which your source is stored must mirror the package structure.
So, suppose you're working c:\myproject as your base directory.
The class "test" with no package qualifiers would have to be c:\myproject\test.java
The class "myjava.practicePack.test" (that is, with the package qualifiers) would have to be in c:\myproject\myjava\practicePack\test.java
In both cases, you would run the javac command from c:\myproject. It then looks down into the directory structure, using the package identifiers, to find your source.
Note that in windows, the directory tree is not case sensitive, but the class and package names still are! In Unix and its variants, of course, the directory names are also case sensitive.
I'm new to Java and have just started experimenting
with Packages and importing classes from my own files.
I keep getting the following error messages: cannot
resolve symbol and package <my package name> does
not exist and class file contains wrong
class:<myclass name and path> Please remove or make
sure it appears in the correct subdirectory of the
classpath.
These class importing problems only occur when I
specifically define the package and/or when I
explicitly import one of my user classes.
I am using 2 simple classes to test this
//package myjava.practicePack; Commented out the
offending line
class test {
     test() {
          System.out.println("Seems to work?@%$#^");
} // This class is found in C:\myjava\practicePack
and also
//package myjava.practicePack;
//import myjava.practicePack.test; // more offensive
code
class testCase {
     public static void main(String[] args) {
          test A = new test();
} // testCase is in the same folder as test.class and
I have also tried it in a subfolder of \practicePack
and also just in \myjava (while test.class is in
myjava\practicePack
Everything works fine when I don't use the package
declaration on both/either classes or import the
test.class into testCase
I'm using windows XP (I know I'm sorry too) and java
1.4.0_01.
My classpath is set to
.;C:\myjava;C:\myjava\practicePack and echo
o %classpath% confirms this.
Can anyone tell me where my problem is?