Java Cross-Platfrom OS detection to declare file path location
public class FileConfiguration {

    private String checkOs() {
        String path = "";
        if (System.getProperty("os.name").startsWith("Windows")) {
            // includes: Windows 2000,  Windows 95, Windows 98, Windows NT, Windows Vista, Windows XP
            path = "C://Users//...";

        }
        elseif (System.getProperty("os.name").startsWith("Mac")) {
            path = "///Users//...";
        }
        return path;

    }

    // declare paths for file source and destination
    String destinationPath = path;
    String sourcePath = path;

if (a) {
// code
} else if (b) {
// code
}