Setting filenames at OS level on Win32

Question

I've done this many times on Unix using the .profile file. But today I need to do it on windows. I went to environment variables and entered
New Variable = DATAFILE1
Value = c:\data1.txt;
New Variable = DATAFILE2
Value = c:\data2.txt;
Then in my code
//Simple program that copies from one file to another
public class demo {
    public static void main(String[] args) throws IOException {
     //This works
     File inputFile = new File("c:\\data1.txt");
     File outputFile = new File("c:\\data2.txt");
     //DATAFILE1,DATAFILE2 Set in control panel to reference files above.
     //compiler: cannot find symbols DATAFILE1, DATAFILE2
     //File inputFile = new File(DATAFILE1);
     //File outputFile = new File(DATAFILE2);
        FileReader in = new FileReader(inputFile);
        FileWriter out = new FileWriter(outputFile);
        int c;
        while ((c = in.read()) != -1)
           out.write(c);
        in.close();
        out.close();
}Any ideas?

Answer 1

Can you try "java -version" at the console, as it looks like you are not.
Look, not depricated: System.getenv(java.lang.String)
Also
// throws NullPointerException
String str = System.getenv("DATAFILE");Does that return null, or throw a NPE? As throwing an NPE would suggest that you are passing null to it, returning null would suggest DATAFILE is dot defined, try
echo %DATAFILE%
or
echo $DATAFILEdepending on platform.