What is the cross-platform way of obtaining the path to the local application data directory?

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You could probably say something like (contradict me if I am wrong, or if this a bad approach)

private String workingDirectory;
//here, we assign the name of the OS, according to Java, to a variable...
private String OS = (System.getProperty("os.name")).toUpperCase();
//to determine what the workingDirectory is.
//if it is some version of Windows
if (OS.contains("WIN"))
{
    //it is simply the location of the "AppData" folder
    workingDirectory = System.getenv("AppData");
}
//Otherwise, we assume Linux or Mac
else
{
    //in either case, we would start in the user's home directory
    workingDirectory = System.getProperty("user.home");
    //if we are on a Mac, we are not done, we look for "Application Support"
    workingDirectory += "/Library/Application Support";
}
//we are now free to set the workingDirectory to the subdirectory that is our 
//folder.

Note that, in this code, I am taking full advantage that Java treats "https://stackoverflow.com/" the same as '\\' when dealing with directories. Windows uses '\\' as pathSeparator, but it is happy with "https://stackoverflow.com/", too. (At least Windows 7 is.) It is also case-insensitive on it’s environment variables; we could have just as easily said workingDirectory = System.getenv("APPDATA"); and it would have worked just as well.

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