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Asked: 2026-06-04T00:29:10+00:00

i have an ArrayList that looks like this: [ 1 2011-05-10 1 22.0, 2

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i have an ArrayList that looks like this: 

[
1 2011-05-10  1  22.0, 
2 2011-05-10  2  5555.0, 
3 2011-05-11  3  123.0, 
4 2011-05-11  2  212.0, 
5 2011-05-30  1  3000.0, 
6 2011-05-30  1  30.0, 
7 2011-06-06  1  307.0, 
8 2011-06-06  1  307.0, 
9 2011-06-06  1  307.0, 
10 2011-06-08  2  3070.0, 
11 2011-06-03  2  356.0, 
12 2011-05-10  2  100.0, 
13 2011-05-30  1  3500.0, 
14 2011-05-10  3  1000.0, 
15 2011-05-10  3  1000.0, 
16 2011-05-07  1  5000.0, 
17 2011-05-07  4  500.0, 
18 2011-08-07  3  1500.0, 
19 2011-08-08  6  11500.0, 
20 2011-08-08  4  11500.0, 
21 2011-08-08  7  11500.0, 
22 2011-06-07  8  3000.0]

Here is the code how i got this arraylist: 

@Override
    public ArrayList<Expenses> getExpenses() {
        ArrayList<Expenses> expenses = new ArrayList<Expenses>();
        try {
            Statement stmt = myConnection.createStatement();
            ResultSet result = stmt.executeQuery("SELECT * FROM expenses");
            while(result.next()){

                Expenses expense = new Expenses();
                expense.setNum(result.getInt(1));
                expense.setPayment(result.getString(2));
                expense.setReceiver(result.getInt(3));
                expense.setValue(result.getDouble(4));

                expenses.add(expense);

                }
        }
            catch (SQLException e){
                 System.out.println(e.getMessage());
             }
        return expenses;
    }

but what i want to get to an arraylist so that each element of array wasn’t the line of the table (what i have now), but every individual element of the table should be the element of array ( [1, 2011-05-10, 1, 22.0, 2, 2011-05-10, 2, 5555.0, 3, 2011-05-11, 3, 123.0,]. Can anyone help me with that?

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1 Answer

  1. Editorial Team

    The only way you could do add into an ArrayList elements of different type, will be to treat them as general objects. However the code you already have is much superior.

    @Override
public ArrayList<Object> getExpenses() {
    ArrayList<Object> expenses = new ArrayList<Object>();
    try {
        Statement stmt = myConnection.createStatement();
        ResultSet result = stmt.executeQuery("SELECT * FROM expenses");
        while(result.next()) {

            expenses.add(new Integer(result.getInt(1)));

            expenses.add(result.getString(2));
            expenses.add(new Integer(result.getInt(3)));
            expenses.add(result.getDouble(4));
        }
    }
    catch (SQLException e) {
        System.out.println(e.getMessage());
    }
    return expenses;
}
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