JTable selects more cells than clicked

Question

I am writing an application that uses a JTable and I would like to be able to select individual cells so I can interact with the selected cells. The problem is that when I select a certain number of cells, the JTable thinks I have clicked more than I actually have. For instance, I click 3 cells and the JTable automatically selects a 4th.

Here is an image of my issue. I select 3 cells in the order numbered in the image, and a 4th one is selected after selecting the 3rd. enter image description here

How can I solve this issue?

Runnable example. My table application looks identical to this(obviously no menus or extra crap but this is how it is setup).

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableModel;

public class TestTable extends JFrame {

    private JPanel contentPane;
    private DefaultTableModel dbModel;
    private JTable table;
    private JScrollPane scrollPane;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                    TestTable frame = new TestTable();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public TestTable() {
        super("Test Table");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 800, 500);

        String[] columnNames = {"Name","Sport","Years Played"};
        Object[][] data = {{"Tim","Baseball","4"},
                {"Josh","Hockey","6"},
                {"Jessica","Volleyball","3"}};

        dbModel = new DefaultTableModel(data, columnNames);
        table = new JTable(dbModel);
        table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        table.getColumnModel().setColumnSelectionAllowed(true);
        table.setCellSelectionEnabled(true);
        scrollPane = new JScrollPane(table);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        contentPane.add(scrollPane, BorderLayout.CENTER);
        setContentPane(contentPane);
    }
}

This sounds like your using a custom cell render but aren't resetting it on each run. Consider posting a runnable demonstration of your problem — MadProgrammer, Feb 25 '14 at 20:13
I am not using a custom cell renderer. I just looked at the TableSelectionDemo by Oracle and the same thing that happens in my application, happens in the demo. — BitWar, Feb 26 '14 at 03:04
Just added a runnable example. It is exactly how my application looks minus all the extra junk. They both behave the same with respect to selecting cells. — BitWar, Feb 26 '14 at 03:58
Hmm, works fine for me, I click 1, 2, 3 without any issues. Running Windows 7 and Java 6 & 7 — MadProgrammer, Feb 26 '14 at 04:11
Perhaps I was being vague in my question. I want to be able to select multiple cells at a time(e.g., click the 1st cell, control+click the 2nd cell, then control+click the 3rd cell and have only those 3 cells selected). When I click and control+click in a pattern similar to the picture I posted, a 4th cell gets highlighted or selected when it wasn't clicked on in the first place. — BitWar, Feb 26 '14 at 04:19

score 4 · Answer 1 · edited May 23 '17 at 12:33

4

To enable single cell selection, use setCellSelectionEnabled(true), which "treats the intersection of the row and column selection models as the selected cells." See also this related answer.

edited May 23 '17 at 12:33

Community

1
1

answered Feb 25 '14 at 17:43

trashgod

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Setting 'setCellSelectionEnabled()' to true did not fix the issue. I just looked at the TableSelectionDemo by Oracle and the same thing that happens in my application, happens in the demo. – BitWar Feb 26 '14 at 03:05
You might look at this alternative [approach](http://stackoverflow.com/a/7620726/230513) for _non_-contiguous selection. – trashgod Feb 26 '14 at 04:00

JTable selects more cells than clicked

1 Answers1