How to set a custom object in a JTable row

Question

I should tell this first, this is NOT about Rendering a Table cell.

Here is the TableModel that i'm building using a 2D array based on a User object in my DB.

    List<User> userList = userManagerService.getAllUsers();

    /* String[] col_user = {"Username", "Name", "Phone", .... } */
    String[][] data = new String[userList.size()][col_user.length];
    int i = 0;
    for (User user : userList) {
        String[] userdata = new String[col_user.length];
        userdata[0] = user.getUserUsername();
        userdata[1] = user.getUserName();
        userdata[2] = user.getUserPhone();
        userdata[3] = user.getUserNic();
        userdata[4] = user.getUserAddress();
        userdata[5] = user.getUserEmail();

        data[i++] = userdata;
    }

    VstTableItemModel tiModel = new VstTableItemModel(data, col_user);
    dataTable.setModel(tiModel);

My problem is how can i get a User object back, using the selected row in the Table. Note that i can't make a new User object and populate it with the row data. I must get the queried User object(objects in userList). So, is their any way to set a Object with a table row ?

Here is my VstTableItemModel class.

public class VstTableItemModel extends AbstractTableModel {

    ArrayList<Object[]> data;
    String[] header;

    public VstTableItemModel(Object[][] obj, String[] header) {
        this.header = header;
        data = new ArrayList<Object[]>();

        for (int i = 0; i < obj.length; ++i) {
            data.add(obj[i]);
        }
    }

    @Override
    public int getRowCount() {
        return data.size();
    }

    @Override
    public int getColumnCount() {
        return header.length;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        return data.get(rowIndex)[columnIndex];
    }

    @Override
    public String getColumnName(int index) {
        return header[index];
    }

}

Are you able to modify the `VstTableItemModel`? – MadProgrammer Sep 24 '12 at 05:39 — MadProgrammer, Sep 24 '12 at 05:39
Yes. Do i need to post it here ? – shan Sep 24 '12 at 05:42 — shan, Sep 24 '12 at 05:42
No, it will just make it easier ;) – MadProgrammer Sep 24 '12 at 05:43 — MadProgrammer, Sep 24 '12 at 05:43

MadProgrammer · Accepted Answer · 2012-09-24T05:49:52.893

Instead of splitting the User object up before you create the model, add it directly to the model and allow the model to do the work for you...

For example

public class VstTableItemModel extends AbstractTableModel {

    private List<User> users;

    public VstTableItemModel(List<User> users) {

        this.users = new ArrayList<User>(users);

    }

    @Override
    public int getRowCount() {
        return users.size();
    }

    @Override
    public int getColumnCount() {
        return 6;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {

        Object value = "??";
        User user = users.get(rowIndex);
        switch (columnIndex) {
            case 0:
                value = user.getUserUsername();
                break;
            case 1:
                value = user.getUserName();
                break;
            case 2:
                value = user.getUserPhone();
                break;
            case 3:
                value = user.getUserNic();
                break;
            case 4:
                value = user.getUserAddress();
                break;
            case 5:
                value = user.getUserEmail();
                break;
        }

        return value;

    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
        return // Return the class that best represents the column...
    }

    /* Override this if you want the values to be editable...
    @Override
    public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
        //....
    }
    */

    /**
     * This will return the user at the specified row...
     * @param row
     * @return 
     */
    public User getUserAt(int row) {
        return users.get(row);
    }

}

This way, you should be able to do something like...

List<User> userList = userManagerService.getAllUsers();
VstTableItemModel tiModel = new VstTableItemModel(userList);

Now when you need to...you can grab a the user that is represent at a specific row...

User user = tiModel.getUserAt(rowIndex);

Thanks. But, What will happen if i sort it ? Then the row index will change. isn't it ? — shan, Sep 24 '12 at 05:53
If you're using `JTable`'s sort API, then you can simply use `JTable. convertRowIndexToModel` to convert the view's (the `JTable`) row index to the model index. — MadProgrammer, Sep 24 '12 at 05:56
I should point out, the row sorter API (`TableRowSorter`) uses a proxy model when sorting, it doesn't actually change the data model, but instead maps the indices between the view and the model — MadProgrammer, Sep 24 '12 at 05:57

How to set a custom object in a JTable row

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