How to add new rows to existing rows in JTable

Question

I have a JTable developed in Netbeans forms. I want the program to work in such a way that when I click a button, the new prepared records will be added to the existing ones. My problem is when I want to add new records, the moment I click the button, it replaces the existing one. Can anyone help me with the method to add new records to existing ones?

Answer 1

Use DefaultTableModel and simple call DefaultTableModel#addRow() method on it to add a new row.

• Here table having 4 existing rows
• A new row is added on button click

sample code:

    Object data[][] = { { "111 Hello", "Capital1", "TX 11111" },
                        { "222 Hello", "Capital2", "TX 22222" },
                        { "333 Hello", "Capital3", "TX 33333" },
                        { "444 Hello", "Capital4", "TX 44444" } 
                      };
    String col[] = { "Name", "Capital", "TX" };

    final DefaultTableModel model = new DefaultTableModel(data, col);
    final JTable table = new JTable(model);

    ....

    final JButton addButton = new JButton("Add");
    addButton.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            Object[] newRecord = { "555 Hello", "Capital5", "TX 55555" };
            model.addRow(newRecord); // <== Adding new row here
        }
    });

Answer 2

My problem is when I want to add new records, the moment i click the button, it replaces the existing one.

Don't create a new TableModel.

Instead you should be using the DefaultTableModel.addRow(...) method to add a new row to the end of the table.