can I get the directory of another file?

I have created an auto-updater for my java program. but at the end of the download it downloads the file to desktop. I can to get where is the program file and update it?

this is my code:

    @Override
    public void run() {
        if(!Debug) {
            try {
                FileUtils.copyURLToFile(new URL("fileurl"), new File(System.getenv("APPDATA") + "\\file.zip"));
                UnzipUtility unzip = new UnzipUtility();
                File deskfile = new File(System.getProperty("user.home") + "/Desktop/file.jar");
                if(deskfile.exists()) {
                    deskfile.delete();
                }

                unzip.unzip(System.getenv("APPDATA") + "\\file.zip", System.getProperty("user.home") + "/Desktop");
                File file = new File(System.getenv("APPDATA") + "\\file.zip");
                file.delete();
                Successfull = true;
            } catch (IOException e) {
                Successfull = false;
            }
            try {
                Updater.sleep(0L);
            }catch(Exception e) {
                e.printStackTrace();
            }
        }
    }

this is the code present in my external updater jar and I need to find the main program directory what can I do?

For example, if the main program is in any other directory except the Desktop, the update will always download it to the desktop ... I need it to change the file that executes the command to start the updater

Solution

If your external updater is in the same directory as your mail application you can use:

System.getProperty("user.dir");

This will give you the current folder. You can find more details here: https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html

If this is not the case i see the following options:

ask the user before updating for the installation folder
store the installation folder in property file inOS user data // update jar folder.

regards, WiPu