الميثود جافا

كيف ممكن اعملهم

1-ميثود في كلاس الفاتورة لانشاء الطلب تستقبل المنتجات المختارة من الميثود Select الموجودة في كلاس المنتجات

2-ميثود في كلاس الفاتورة تستقبل الطلب + تستقبل معللومات العميل من كلاس العميل + المجموع الكلي للطلب

public class Invoices {
    
    public double total;
    private Customer customer;
    private Product product;
    
    public Invoices (double total0,Product products0,Customer customer0){
    this.total=total0;
    this.product = new Product(products0);
    this.customer= new Customer(customer0);
    }
    public Invoices(){
        this.total=0;
        this.product=null;
        this.customer=null;
    }

    public double getTotal() {
        return total;
    }

    public void setTotal(double total) {
        this.total = total;
    }

    public Product getProduct() {
        return new Product (product);
    }

    public void setProduct(Product products) {
        this.product = new Product (products);
    }

    public Customer getCustomer() {
        return new Customer (customer);
    }

   public class Invoices {
    
    public double total;
    private Customer customer;
    private Product product;
    
    public Invoices (double total0,Product products0,Customer customer0){
    this.total=total0;
    this.product = new Product(products0);
    this.customer= new Customer(customer0);
    }
    public Invoices(){
        this.total=0;
        this.product=null;
        this.customer=null;
    }

    public double getTotal() {
        return total;
    }

    public void setTotal(double total) {
        this.total = total;
    }

    public Product getProduct() {
        return new Product (product);
    }

    public void setProduct(Product products) {
        this.product = new Product (products);
    }

    public Customer getCustomer() {
        return new Customer (customer);
    }

    public void setCustomer(Customer customer) {
        this.customer = new Customer (customer);
    }
    public String toString(){
        String text="""
                    Invoices information :
                    Customer information :
                    """+this.customer+
                "\nThe products :\n"+this.product+"\nThe total price :" +this.total;
Return text;
        return null;
    }

   
}