Populate a jTable from an ArrayList

Question

I'm trying to populate a JTable from an ArrayList, The ArrayList is filled with data from my database.

this is the code I tried :

DefaultTableModel model = new DefaultTableModel();

        model.setColumnIdentifiers(new String[]{"Numéro d'ordre", "Article", "Quantité", "Remarque"});
        for (gestionstock.LigneBonInterne o : listLigneBonInterne) {
            model.addRow(new String[]{o.getNumOrder().toString(), o.getdesgArt(), o.getQte().toString(), o.getRemarque()});
            System.out.println(o.toString());
        }

        jTable1.setModel(model);

But I get this error message :

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at magasinier.BonInterneDetails.(BonInterneDetails.java:63)

the ligne 63 is : jTable1.setModel(model);

I did a test to see if the ArrayList is filled, and I found that the ArrayList is filled with records which means that there is no problem with filling the ArrayList

How can I solve this problem ?

EDIT :

I tried to create the JTable using code and assign it to ScrollPane :

JTable jTable1 = new JTable(model);
        jTable1.setModel(model);
         jScrollPane1.setViewportView(jTable1);

But I still get the same error this time is the line : jScrollPane1.setViewportView(jTable1);

So now your jSCrollPane1 variable is null. You'll want to work this out. — Hovercraft Full Of Eels, Jun 07 '13 at 01:15
Here's a related [example](http://stackoverflow.com/a/9134371/230513) built on `Map`. — trashgod, Jun 07 '13 at 01:20

Reimeus · Accepted Answer · 2013-06-07T00:36:40.920

3

Initialize the JTable jTable1 prior to setting the TableModel

jTable1 = new JTable(model);
jTable1.setModel(model);

edited Jun 07 '13 at 00:36

answered Jun 07 '13 at 00:15

Reimeus

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I can't do that, I'm using netbeans. – Aimad Majdou Jun 07 '13 at 00:18
@user2417302 I don't see how your choice of editor affects the code. – chollida Jun 07 '13 at 00:24
@chollida in netbeans I created the jTable by drag and drop from the palette, so the jTable is protected from changes I make to him. – Aimad Majdou Jun 07 '13 at 00:31
I tried to create the jTable using code, and I did the same as in your post but I'm still getting the same problem – Aimad Majdou Jun 07 '13 at 00:35
@user2417302 Can you ensure that you call `initComponents` before calling your code? This will instantiate your code. (This is why coding by hand gives you more freedom with the code.) – Reimeus Jun 07 '13 at 00:44

score 0 · Answer 2 · answered Jun 07 '13 at 01:54

0

In Netbeans palette you can specify some custom post-initialization code or use a custom constructor.

answered Jun 07 '13 at 01:54

rimero

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8

Populate a jTable from an ArrayList

EDIT :

2 Answers2