How to get the information that was recorded in the ArrayList?

Question

I created a java application where login credentials are required to have access. I recorded the information about username in ArrayList.

private void jBLoginActionPerformed(java.awt.event.ActionEvent evt) {                                        

    String sql="select * from logins where username=? and password=? and idTypeLogin=?";
    try{
        pst=(PreparedStatement) conexao.prepareStatement(sql);
        pst.setString(1, jTUser.getText());
        pst.setString(2, jPass.getText());
        pst.setString(3, jComboBoxTipoLogin.getSelectedItem().toString());

        rs=pst.executeQuery();
        if(rs.next()){

            String idTypeLogin= rs.getString("idTypeLogin"); 

            if (idTypeLogin.equals("Administrator")) {

                jTTaskAdmin ah = new jTTaskAdmin();
                ah.setVisible(true);

            }
             else {
                jTTaskTecnic eh = new jTTaskTecnic();
                eh.setVisible(true);

            }
            this.setVisible(false);
            }
        else{
            JOptionPane.showMessageDialog(null, "User Invalid");
              }
                //close();
            }catch(Exception e){
        JOptionPane.showMessageDialog(null, e);
            }



        List<String> loggedInUsers = new ArrayList<String>();
     loggedInUsers.add(jTUser.getText())

            List<String> t = loggedInUsers;   

           jTTasktecnic.recordVar=loggedInUsers.get(0);  
   }

enter image description here

And I add this code in second form

static String recordVar;

How can I do to get the information that was recorded in the array, but in another form. That is, I recorded the information in ArrayList in the Login form, now I want to get this information in another form.

How can I do this?

Thank you

Hey .. jUst try like this `yourList.get(0)` if the list having one element.. Check out for the documentation. — Rookie007, Apr 18 '14 at 08:37

score 1 · Accepted Answer · answered Apr 18 '14 at 08:41

1

You can do it Like this

Form two

Declare A variable where you want to store ArrayList Item(May be String or Int or something else)

You can also declare it static.

But declare it Globally (Means at start of the class not inside method or something else)

Form One

Store ArrayList Item in Variable of Form 2 OnClick of logIn button.

Form2 ob=new Form2();
ob.recordVar=arrayList.get(3);//it will access recordVar of Form2 3rd element of ArrayList for example

Or you can declare Form2 variable static and acces it via class name.

Like this

Form2.recordVar=arrayList.get(3);

answered Apr 18 '14 at 08:41

akash

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Thanks for reply. what is recordVar? I tried the code that you gave very kindly, but gives error in recordVar. – strange_098 Apr 18 '14 at 10:33
Okay `recordVar` is variable you have to declare on second form you want to go,so declare it in second form as `String recordVar;` – akash Apr 18 '14 at 10:36
Thanks again.I do that, but i made a system.out.println and recordVar is null only in 2nd form :S – strange_098 Apr 18 '14 at 10:46
Have you initialized variable in first form onclik? As suggested in my answer. – akash Apr 18 '14 at 10:48
I think I do that. I edit my post, than you can check ;) – strange_098 Apr 18 '14 at 10:51
1

Scope of this `jTTaskTecnic eh = new jTTaskTecnic();` is limited to else block so declare at start of method and try. – akash Apr 18 '14 at 10:55
1

Oh don't call me Sir :) Glad to help you. :) – akash Apr 18 '14 at 11:10

score 0 · Answer 2 · answered Apr 18 '14 at 08:35

0

define ArrayList as global so you can access it whenever you want.

answered Apr 18 '14 at 08:35

Jay M

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8

Thanks for reply, how can I do that? I'm new in JAVA :S – strange_098 Apr 18 '14 at 08:36

Shiva Kumar · Answer 3 · 2014-04-18T10:30:34.363

0

Let your method return the loggedInUsers and use it where you want. Change the method signature accordingly. Global variables are notorious. It is better to reduce the scope to where it is just required

private List<String> jBLoginActionPerformed(java.awt.event.ActionEvent evt) 
{
   // do samething
   return t
}

edited Apr 18 '14 at 10:30

answered Apr 18 '14 at 08:41

Shiva Kumar

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How to get the information that was recorded in the ArrayList?

3 Answers3