try
    {
        FileWriter filewriter;
        filewriter= new FileWriter("Medicine Sheet.txt",true);

        String Name, Company, BatchNo, Price,DOM, DOE;
        int Quantity;
        Name = NameTB.getText();
        if(Name.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"Name Not Enter Correctly");
        }
        else
        {
            Pattern phpattern = Pattern.compile("\\w");
            Matcher phmatcher = phpattern.matcher(Name);
            if(!phmatcher.matches())
            {
                JOptionPane.showMessageDialog(null,"Invalid Name, Try Again");
            }


            else
            {
                filewriter.write(Name+" ");
                filewriter.write("\r\n");
                filewriter.close();
                JOptionPane.showMessageDialog(null,"File Written Successfully !");
            }

        }
        Company = CompanyTB.getText();
        if(Company.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"Company Not Enter Correctly");
        }
        else
        {
                filewriter.write(Company+" ");
                filewriter.write("\r\n");
                filewriter.close();
                JOptionPane.showMessageDialog(null,"File Written Successfully !");
        }
        BatchNo = BatchnoTB.getText();
        if(BatchNo.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"Batch Number Not Enter Correctly");
        }
        else
        {
                filewriter.write(BatchNo+" ");
                filewriter.write("\r\n");
                filewriter.close();
                JOptionPane.showMessageDialog(null,"File Written Successfully !");
        }
        Price = (PriceTB.getText());
        if(Price.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"Price Not Enter Correctly");
        }
        else
        {
                filewriter.write(Price+" ");
                filewriter.write("\r\n");
                filewriter.close();
                JOptionPane.showMessageDialog(null,"File Written Successfully !");
        }
        DOM = DOMTB.getText();
        if(DOM.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"DOM Not Enter Correctly");
        }
        else
        {
                filewriter.write(DOM+" ");
                filewriter.write("\r\n");
                filewriter.close();
                JOptionPane.showMessageDialog(null,"File Written Successfully !");
        }
        DOE = DOETB.getText();
        if(DOE.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"DOE Not Enter Correctly");
        }
        else
        {
                filewriter.write(DOE+" ");
                filewriter.write("\r\n");
                filewriter.close();
                JOptionPane.showMessageDialog(null,"File Written Successfully !");
        }
        Quantity = Integer.parseInt(QuantityTB.getText());
        if(Quantity.isEmpty())
        {
            JOptionPane.showMessageDialog(null,"Quantity Not Enter Correctly");
        }
        else
        {
            filewriter.write(Quantity+" ");
            filewriter.write("\r\n");
            filewriter.close();
            JOptionPane.showMessageDialog(null,"File Written Successfully !");
        }



    }

    catch (IOException ex)
    {
            Logger.getLogger(AddMedicine.class.getName()).log(Level.SEVERE, null, ex);
            JOptionPane.showMessageDialog(null,"File Invalid");
    }
    }