BankAccount program , adding to arraylist through a method

Question

I'm having a problem adding an object to an arraylist, using a method from class throws a error and I cant seem to find the problem. The error is Error = non-static variable db cannot be referenced from a static contex

Driver code (there are 5 cases but problem is in the case shown. last line above break)

package bankaccount;
import java.util.Random;
public class DriverClass 
{
    Database db = new Database();
    Database Deleted = new Database();
    boolean done = false;

    public static void main(String[] args)
    {
        while (!false)
        {
            int menu = IO.getInt("Please choose one of the following:"+
                    "\n 1 to create new account"+ "\n 2 to delete an account"+
                    "\n 3 to withdraw from an account"+"\n 4 to deposit to an account"+
                    "\n 5 to list all customers"+"\n 6 to list all deleted customers"+
                    "\n 7 to display single account "+"\n 8 to exit this program");

            switch(menu)
            {


            case 1:
                //Create bankaccount object  = creates new account
                String LastName = IO.getString("Please type last name: ");
                String FirstName = IO.getString("Please type first name: ");
                Name n = new Name (LastName,FirstName);

                //Create address object
                String street = IO.getString("Please type your address: ");
                String city = IO.getString("Please type your city: ");
                String state = IO.getString("Please type your state: ");
                String zipcode = IO.getString("Please type your zipcode: ");
                Address addr = new Address (street,city,state,zipcode);
                //Create Account number
                Random randomGenerator = new Random();
                int randomInt = randomGenerator.nextInt(2000000000);
                AccountNum accno = new AccountNum(randomInt);
                //Create customer object
                Customer c = new Customer(n,addr,accno);
                //Create bankaccount object 
                double amt = IO.getDouble("Please type the opening account balance: ");
                BankAccount b = new BankAccount(c, amt);
                db.add(b);
                break;

& here is the code from the database class - calling the add method for array list package bankaccount;

import java.util.ArrayList;

public class Database 
{
    int index;
    boolean found;
    ArrayList<BankAccount> list;
    BankAccount acc;

    Database()
    {
        ArrayList<BankAccount> list = new ArrayList<BankAccount>();
    }

    public void add(BankAccount b)
    {
        list.add(b);
    }

    BankAccount remove (int i)
    {
        return list.remove(i);
    }

    BankAccount getaccount()
    {
        return acc;
    }

    ArrayList getlist()
    {
        return list;
    }

    int getindex()
    {
        return index;
    }

    boolean inlist()
    {
        return found;
    }

    void search (String key)
    {
        found = false;
        int i = 0;
        //int.length = list.size();

        while (i < list.size() && !found)
        {
            BankAccount b = list.get(i);
            if (key.equals(b.getcustomer()))
            {
                acc = b; found = true; index = i;
            }
            else 
            {
                i++;
            }
        }
    } 
}

Error = non-static variable db cannot be referenced from a static context. Appreciate any push in the right direction! — ArronG
– ArronG, Commented May 28, 2013 at 2:50
check this out stackoverflow.com/questions/5671610/… stackoverflow.com/questions/3527137/… — user1987371
– user1987371, Commented May 28, 2013 at 2:51
Thank you for the links - did help me clarify how to add objects to arraylist. — ArronG
– ArronG, Commented May 28, 2013 at 3:03

Craig · Accepted Answer · 2013-05-28 02:58:42Z

0

At the end of the switch block you make reference to the db object which is not static, however you are in a static context (public **static** void main). The simple solution would be to change the line

Database db = new Database();

to

static Database db = new Database();

You will likely need to change the other two variables as well.

answered May 28, 2013 at 2:58

Craig

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