Packages, classpath, sigh...

Question

I have a package, which has different versions for mac and windows. So, I thought I would make 2 folders one called "mac" and one called "win" and stick the corresponding package version into each folder along with shared library files for the OS. Depending on which OS the program is running on, I would set the classpath and library path to either "mac" or "win." However, even though both the classpath and libpath ARE being set correctly (I've checked them with println's) the prog cannot find the classes in the package.
The strange thing is, if I'm on say for instance "mac" os, and I place the macos package AND macos sharedlibrary into my CURRENT directory(along with all my classes and src files) and I set the CLASS and LIBRARY paths to THAT directory, the program finds the package and the lib without a problem and the program runs. I think my problem is that when I put a package into a folder, that folder actually becomes part of the fully qualified package name even though I didn't declare it that way with my package statement in my classes... Or something to do with placing a package into a folder that I cannot figure out. Any of you guys able to help me? Here's some code snippets...
This sets class and lib to current dir and works
import java.io.File;
import java.io.IOException;
public class PathSetter
     PathSetter()
        try
            String classpath = System.getProperty("java.class.path");
            String libpath = System.getProperty("java.library.path");
            File thisDir = new File (".");
               String pathSep = System.getProperty("path.separator");
               String[] dirs1 = classpath.split(pathSep);
               String[] dirs2 = libpath.split(pathSep);
               boolean classThere = false;
               boolean libThere = false;
               for(int i = 0; i < dirs1.length; i++)
                    if(dirs1.equals(thisDir.getCanonicalPath()))
                         classThere = true;
                         break;
          for(int i = 0; i < dirs2.length; i++)
                    if(dirs2[i].equals(thisDir.getCanonicalPath()))
                         libThere = true;
                         break;
          if(classThere == false)
               String currentDir = thisDir.getCanonicalPath();
                    System.setProperty("java.class.path", classpath + pathSep + currentDir + pathSep);
               if(libThere == false)
               String currentDir = thisDir.getCanonicalPath();
                    System.setProperty("java.library.path", libpath + pathSep + currentDir + pathSep);
     catch(IOException e){ e.printStackTrace(); }
This sets class and lib to corresponding OS folder, and DOES NOT work
import java.io.File;
import java.io.IOException;
public class PathSetter
     PathSetter()
        try
            String classpath = System.getProperty("java.class.path");
            String libpath = System.getProperty("java.library.path");
            String pathSep = System.getProperty("path.separator");
            String os = System.getProperty("os.name");
            String firstThree = os.substring(0, 3);
            File thisDir = new File (".");
            File newDir = null;
               String[] dirs1 = classpath.split(pathSep);
               String[] dirs2 = libpath.split(pathSep);
               boolean classThere = false;
               boolean libThere = false;
               if(firstThree.equalsIgnoreCase("win") == true)
               { newDir = new File(thisDir.getCanonicalPath() + System.getProperty("file.separator") + "win"); }
               else if(firstThree.equalsIgnoreCase("mac") == true)
               { newDir = new File(thisDir.getCanonicalPath() + System.getProperty("file.separator") + "mac"); }
               for(int i = 0; i < dirs1.length; i++)
                    if(dirs1.equals(newDir.getCanonicalPath()))
                         classThere = true;
                         break;
          for(int i = 0; i < dirs2.length; i++)
                    if(dirs2[i].equals(newDir.getCanonicalPath()))
                         libThere = true;
                         break;
          if(classThere == false)
               String correctDir = newDir.getCanonicalPath();
                    System.setProperty("java.class.path", classpath + pathSep + correctDir + pathSep);
               if(libThere == false)
               String correctDir = newDir.getCanonicalPath();
                    System.setProperty("java.library.path", libpath + pathSep + correctDir + pathSep);
     catch(IOException e){ e.printStackTrace(); }

Answer 1

Ok heres the setup.
In my "main" folder I have all class and source files. This folder is called "test."
Within that folder along with class/src files are 2 folders called "mac" and "win"
Inside "mac" is the mac version of the package "org.eclipse.swt" and also the mac shared library.
Inside "win" is the windows version of "org.eclipse.swt" and also the windows .dll files.
First I run the pathsetter class in the snippets I originally posted. Setting the class and lib paths to either "mac" or "win."
Then from classes in the "test" folder, I have import statements like "import org.eclipse.swt.graphics.*, import org.eclipse.swt.events.*, etc. Because only one of the "mac"/"win" folders is in the class/lib paths, those import statements should import the correct packages. i.e. If I'm on mac, it should import the package in the "mac" folder because that is the only place it knows to look.
Does this help? The problem I was running into was finding a way to determine which OS I was on, and then be able to import the correct package and lib files after making that determination. The only way I could think to do this was to make the 2 folders and set classpath and libpath.