illegal start of expression

static void AddNewCustomer()
{
    try
    {
        int id;
        String UniqCustID, uniqcustid, newcust, UniqueNumber;

        do
        {
            UniqCustID  = "Please enter unique customer id : ";
            uniqcustid  = JOptionPane.showInputDialog( UniqCustID );

            UniqueNumber(id, newcust);

            if (UniqueNumber(id, newcust) == false)
            {
                JOptionPane.showMessageDialog(null, "Customer id already exists or you entered a number less than 1!");
        }