public static String getFileExtension(URL extUrl) {        //URL: "http://photosaaaaa.net/photos-ak-snc1/v315/224/13/659629384/s659629384_752969_4472.jpg"       // String filename = "";        //PATH: /photos-ak-snc1/v315/224/13/659629384/s659629384_752969_4472.jpg        String extension="";        String path = extUrl.getPath();        //Checks for both forward and/or backslash        //NOTE:**While backslashes are not supported in URL's        //most browsers will autoreplace them with forward slashes        //So technically if you're parsing an html page you could run into        //a backslash , so i'm accounting for them here;        String[] pathContents = path.split("[\\\\/]");        if(pathContents != null){            int pathContentsLength = pathContents.length;            //System.out.println("Path Contents Length: " + pathContentsLength);//            for (int i = 0; i < pathContents.length; i++) {//                System.out.println("Path " + i + ": " + pathContents[i]);//            }            //lastPart: s659629384_752969_4472.jpg            String lastPart = pathContents[pathContentsLength-1];            String[] lastPartContents = lastPart.split("\\.");            if(lastPartContents != null && lastPartContents.length > 1){                int lastPartContentLength = lastPartContents.length;               // System.out.println("Last Part Length: " + lastPartContentLength);                //filenames can contain . , so we assume everything before                //the last . is the name, everything after the last . is the                //extension                String name = "";                for (int i = 0; i < lastPartContentLength; i++) {                   // System.out.println("Last Part " + i + ": "+ lastPartContents[i]);                    if(i < (lastPartContents.length -1)){                        name += lastPartContents[i] ;                        if(i < (lastPartContentLength -2)){                            name += ".";                        }                    }                }                extension = lastPartContents[lastPartContentLength -1];               // filename = name + "." +extension;               // System.out.println("Name: " + name);               // System.out.println("Extension: " + extension);               // System.out.println("Filename: " + filename);            }        }        return extension;    }