Class inheritance issues!

Question

Hello,
I have this code working on one computer but it won't work on another.
// - CPoint class
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CPoint extends Object
   public double dX, dY, dHeight, dZ;
   public CPoint( double dNewX, double dNewY, double dNewHeight, double dNewZ )
      //Store coordinate values
      dX = dNewX;
      dY = dNewY;
      dHeight = dNewHeight;
      dZ = dNewZ;
}this class compiles perfectly. However when I then compile this...
// - PLine class
public class PLine extends Object
   public CPoint cpoint[];
   public NewFile3 nFile3;
   double dX, dY, dHeight, dAngle, dZ;
   public PLine(String sNewzoneName, String sNewfileName, double dNewLLx, double dNewLLy, double dNewLLz)
     try
        //Call FileRead2 class
        nFile3 = new NewFile3(sNewzoneName, sNewfileName);
     catch (Exception exception)
        exception.printStackTrace();
     //Create array to store CPoint objects
     cpoint = new CPoint[nFile3.npCounter];
     dHeight = nFile3.dH + dNewLLz;
     dZ = dNewLLz;
     dAngle = nFile3.dAngle;
     for( int t=0; t<cpoint.length; t++)
        //Obtain values from FileRead2
        dX = nFile3.Points[t][0] + nFile3.dlX + dNewLLx;
        dY = nFile3.Points[t][1] + nFile3.dlY + dNewLLy;
        //Create an array of CPoint objects
        cpoint[t] = new CPoint( dX, dY, dHeight, dZ );
}I get, amongst others, the following error...
".....C:\Documents and Settings\WalterOG\Desktop\New Folder\PLine.java:11: cannot resolve symbol
symbol : class CPoint
location: class PLine
public CPoint cpoint[];
It doesn't make sense because the software I'm using on both computers is the same except there maybe a newer version of Java on the machine that is giving the error???
One other question, does Visual Studio 6 support swing? I'm not even using VS but I was just wondering??
Anyone got any ideas??
Cheers,
wALLY!

Answer 1

It would appear that you didn't put either class in a package. You will have to be careful that the compiler expects all your classes to be in the anonymous package. Are you using the javac command line compiler or some development environment to try to compile your code? The development environment may assume that your classes are supposed to be in some package, based on the directory path they are located under, and on your current project's properties in the IDE.
If you are using javac, then you need to invoke it from the same directory that the .java files are located in. You can't, for instance, say "javac myDirectory" from the directory above where the source files are stored. In that case, javac would assume that your classes were in a package called "myDirectory" but they aren't so it wouldn't be able to find them.