что я упускаю?

if (args.length > 0) {

    if (args[1].length() > 8) args[1] = args[1].substring(0, 8);
    int id = Integer.parseInt(args[1]);
    if (base.checkHaveID(id)) {

        if (args[0].equals("-d")) {
            base.removeElement(id);

        } else if (args[0].equals("-u")) {
            if (args[2].length() > 30) args[2] = args[2].substring(0, 30);
            if (args[3].length() > 8) args[3] = args[3].substring(0, 8);
            if (args[4].length() > 4) args[4] = args[4].substring(0, 4);
            base.updateElement(id, args[2], args[3], args[4]);
        }
    }
    base.writeToFile(fileName2);
}

boolean checkHaveID(int id){
    return base.keySet().contains(id);
}

void writeToFile(String fileName) throws IOException {
    BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
    int i =base.size();
    for (Element element : base.values()){
        writer.write(element.toString());
        i--;
        if (i>0) writer.write("\n");
    }
    writer.close();
}

//        args = new String[5];
//        args[0] = "-u";
//        args[1] = "5";
//        args[2] = "Dog";
//        args[3] = "1000";
//        args[4] = "5";

args = "-u 5 Dog 1000 5".split(" ");

//        args = new String[5];
//        args[0] = "-u";
//        args[1] = "5";
//        args[2] = "Dog";
//        args[3] = "1000";
//        args[4] = "5";

String name = "";
for (int i = 2; i < args.length - 2; i++) {
    name += args[i] + " ";
}
args[2] = name.trim();
args[3] = args[args.length - 1];
args[4] = args[args.length - 2];

String name = "";
for (int i = 2; i < args.length - 2; i++) {
    name += args[i] + " ";
}
args[2] = name.trim();
String price = args[args.length - 2];
args[4] = args[args.length - 1];
args[3] = price;

String productName = "";
for (int i = 2; i < args.length - 2; i++) {
    productName += args[i] + " ";
}
productName =  productName.trim();
String price = args[args.length - 2];
String quantity = args[args.length - 1];

public static void main(String[] args) throws IOException {

    if (args.length > 0 && (args[0].equals("-d") || args[0].equals("-u"))) {
        String id = args[1];
        String fileName = readString();

        List<String> strings = new ArrayList<>();
        BufferedReader reader = new BufferedReader(new FileReader(fileName));
        while (reader.ready()) {
            String str = reader.readLine();
            String readedID = str.substring(0, 8);
            if (readedID.trim().equals(id)) {
                if (args[0].equals("-d")) ;
                else if (args[0].equals("-u")) strings.add(updatedString(readedID, args));
            } else {
                strings.add(str);
            }
        }
        reader.close();

        writeList(strings, fileName);
    }
}

static String readString() throws IOException {
    BufferedReader readerConsol = new BufferedReader(new InputStreamReader(System.in));
    String string = readerConsol.readLine();
    readerConsol.close();
    return string;
}

static void writeList(List<String> strings, String fileName) throws IOException {
    BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
    writer.write(strings.get(0));
    for (int i = 1; i < strings.size(); i++) {
        writer.write("\n" + strings.get(i));
    }
    writer.close();
}

static String formatString(String string, int lenght) {
    if (string.length() > lenght) {
        string = string.substring(0, lenght);
    } else {
        for (int i = string.length(); i < lenght; i++) {
            string += " ";
        }
    }
    return string;
}

static String updatedString(String id, String[] args) {
    String productName = "";
    for (int i = 2; i < args.length - 2; i++) {
        productName += args[i] + " ";
    }
    productName = formatString(productName.trim(), 30);
    String price = formatString(args[args.length - 2], 8);
    String quantity = formatString(args[args.length - 1], 4);

    return id + productName + price + quantity;
}