扫描仪，数组和DataOutputStream

Question

你们都。我对基本Java有疑问。

因此，我一直在尝试找出如何从Controller类输入产品的数据，以及如何使用DataOutputStream将数据保存在文本文件中。产品类别已封装。但是我收到一些语法错误。如果有人可以帮助我，将不胜感激。

public class DataStream {
    Product[] product = new Product[5];
    Scanner sc = new Scanner(System.in);

    public void productList() {
        for(int i=0; i<4; i++) {
            product[i] = new Product();
            System.out.println("Input a product name");
            String name = product[i].setName(sc.nextLine());
            System.out.println("Input a price");
            int price =product[i].setPrice(sc.nextInt());
            System.out.println("Input a product quantity");
            int quantity =product[i].setQuantity(sc.nextInt());
            System.out.println("Input a product discount");
            double discount =product[i].setDiscount();
        }
    }

    public void addFile() {
        DataOutputStream dos = null;
        try {
            dos = new DataOutputStream(new FileOutputStream("product.dat"));
            dos.writeUTF(product.getName());
            dos.writeInt(product.getPrice());
            dos.writeInt(product.getQuantity());
            dos.writeDouble(product.getDiscount());
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                dos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public void printFile() {
        DataInputStream dis = null;
        try {
            dis = new DataInputStream(new FileInputStream("product.dat"));
            dis.readUTF(); dis.readInt(); dis.readDouble();
            System.out.println(product);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                dis.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}