Fully qualified filename (including path)

Question

I have a sample program I'm playing with to learn a bit about JAVA. In the code below I have variables named 'file1' and 'file2' which are defined with a filenames 'file1.txt' and file2.txt respectively.
So when the program executes it looks for these files in the current directory. However, if I want to change these values to 'c:\file1.txt' and 'c:\ttmsapps\file2.txt' then I can't compile the program.
Would someone be able to show me in the code below how to specify a fully qualified filename? I'd certainly appreciate seeing the example.
import java.io.File;
import java.lang.Object;
import java.util.Date;
import java.text.Format;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class CompareFileDates {
  public static void main(String[] args) {
    String fileStatus = " ";
    String file1 = "file1.txt";
    String file2 = "file2.txt";
    long date1 = 0;
    long date2 = 0;
    String finalDate1 = null;
    String finalDate2 = null;
    boolean file1Exists = (new File(file1)).exists();
    boolean file2Exists = (new File(file2)).exists();
    if (file1Exists) {
        // Get the timestamp from file 1 and format it
        date1 = (new File(file1)).lastModified();
     Date newDate1 = new Date(date1);
     DateFormat df = new SimpleDateFormat();
     finalDate1 = df.format(newDate1);
    else {
        // File or directory does not exist
        fileStatus = file1 + " does not exist.  ";
...more

Answer 1

Awesome. I'm getting very close.
However, in building the variable 'file1' on the Windows-side I will need to be specific to the which Drive Letter the file exists on...for instance I may need to specify 'C:\' as part of the creation of the 'file1' variable. This is because the java program will be executed by people on the File Server on the K: drive, yet I want the program to specify a file on their C: drive. If I do this then the program wouldn't run on UNIX, right? Because UNIX doesn't have Drive Letters (e.g. C:, K:).
In this case would I have to hard code the Drive Letter for Windows and then edit and remove the Drive Letter before running the program on UNIX?
Here's my program so far which will run on Windows or UNIX, but it doesn't have the Drive Letter differences required on Windows so the program would have to be executed by the user on the same Drive Letter as the file I'm specifying.
import java.io.File;
import java.lang.Object;
import java.util.Date;
import java.text.Format;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class CompareFileDates {
  public static void main(String[] args) {
    String file1 = File.separator + "exfc" + File.separator + "its" + File.separator + "file1.txt";
    System.out.println(file1);
}The output on Windows:
K:\COMMON\ITS\STEVEB\java\CompareFileDates>java CompareFileDates
\exfc\its\file1.txtThe output on UNIX:
/data/users/ssbuechl/java/CompareFileDates >java CompareFileDates
/exfc/its/file1.txt