reading (which is ok ill give it that
public static String read(String folderName, String file, int lineNumber) {
    	String read = null;
        try {
            in = new BufferedReader(new FileReader(folderName + "/" + file));
            while (lineNumber > 0) {
                read = in.readLine();
                lineNumber--;
            }
            in.close();
        } catch (Exception e) {
            System.err.println(e);
        }
        return read;
}

writing (which is very annoying considering you cant write to a specific line. it goes down the page and whatever line comes first it writes to)
public static void write(String folderName, String file, String outString, boolean clear, boolean newLine) {
        try {
        	if (!clear) {
        		out = new BufferedWriter(new FileWriter(folderName + "/" + file, true));
        	} else {
        		out = new BufferedWriter(new FileWriter(folderName + "/" + file));
        	}
        	out.write(outString);
            if (newLine) {
            	out.newLine();
            }
            out.close();
        } catch (Exception e) {
            System.err.println(e);
        }
 }