import java.io.File;

​

public class ProgramDataLocation {

    public static String programDataDir() {

        String osName = osName();

        if (osName.startsWith("Windows")) {

            String localAppDataDir = System.getenv("LOCALAPPDATA");

            if (localAppDataDir != null && !localAppDataDir.isEmpty()) {

                return localAppDataDir;

            } else {

                // Fallback to the user's home directory if LOCALAPPDATA is not set

                return userDir();

            }

        } else if (osName.startsWith("Linux")) {

            String xdgDataHome = System.getenv("XDG_DATA_HOME");

            if (xdgDataHome != null && !xdgDataHome.isEmpty()) {

                return xdgDataHome;

            } else {

                return userDir() + File.separator + ".local" + File.separator + "share";

            }

        } else {

            return ""; // Handle other OSes as needed

        }

    }

​

    public static String userDir() {

        return System.getProperty("user.home");

    }

​

    public static String osName() {

        return System.getProperty("os.name");

    }

​

    public static void main(String[] args) {

        String programDataDir = programDataDir();

        System.out.println("Program Data Directory: " + programDataDir);

    }

}