Execute the following simple test:

import java.awt.*;

public class slash {
  public static void main(String[] args) {
    FileDialog fd = new FileDialog((Frame)null, "save", FileDialog.SAVE);
    fd.setVisible(true);
    System.err.println("dir: " + fd.getDirectory());
  }
}

Note that the dialog is modal, so System.err.println() should be executed after the dialog is hidden/disposed. However, even if the dialog is still visible, the current directory is printed to console in ~5 secs after the dialog is shown.