java pass data to JTable's row upon button click

Question

I'm doing a java app which has to pass an initialized array of string to display as a row to a JTable.

This is what I tried:

      Object[] _row1;

      public PrintMeNow() {
            table = new JTable();
    table.setBounds(16, 203, 362, 16);
    table.setShowHorizontalLines(true);
    table.setShowVerticalLines(true);
    table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    table.setModel(new DefaultTableModel(
        new Object[][] {
                _row1, {2,2,2}, {3,3,3}, {4,4,4}
        },
        new String[] {
            "QTY", "Item Code", "Amount"
        }
    ));

     }

  btnStart.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent arg0) {
           _row1 = new Object[]{"DN Korina", "DN Madrid", "DN Romania"};
      }
  });

But when I pressed the start button, it's not filling the row. What am I doing wrong in here? Help is much appreciated. Thanks.

May the same question here http://stackoverflow.com/questions/20514181/actionevent-of-a-component-on-a-table-cell-doesnt-take-place — PHPFan, Jan 07 '14 at 09:26

Paul Samsotha · Accepted Answer · 2014-01-07T10:59:30.977

What you need to do is add a row to the Model. Something like this

public void actionPerformed(ActionEvent arg0) {
    DefaultTableModel model = (DefaultTableModel)table.getModel();
    model.addRow(new Object[]{"DN Korina", "DN Madrid", "DN Romania"});
}

The easiest way is to set up you model before hand to have no rows

String[] colNames = {
       "QTY", "Item Code", "Amount"
};

DefaultTableModel model = new DefaultTableModel(colNames, 0);  <== 0 rows
JTable table = new JTable(model);

Then whatever rows you want to add, just add to the model

public void actionPerformed(ActionEvent e){
    model.addRow(new Object[]{"DN Korina", "DN Madrid", "DN Romania"});
}

UPDATE Example

import java.awt.*;
import java.util.Stack;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class TestTable {

    private String[] colNames = { "Col 1", "Col2", "Col3", "Col4", "Col5" };

    private DefaultTableModel model = new DefaultTableModel(colNames, 0);
    private JTable table = new JTable(model);
    private MyStack myStack = new MyStack();
    private Stack<Integer[]> stack;

    private JButton button = new JButton("Add Row");

    public TestTable() {
        stack = myStack.getStack();

        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (!stack.isEmpty()) {
                    Integer[] array = stack.pop();
                    model.addRow(array);
                }
            }
        });

        JFrame frame = new JFrame();
        frame.add(new JScrollPane(table), BorderLayout.CENTER);
        frame.add(button, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TestTable();
            }
        });
    }
}

class MyStack {
    public Stack<Integer[]> stack = new Stack<Integer[]>();

    public MyStack() {
        int k = 1;
        for (int i = 0; i < 20; i++) {
            Integer[] array = new Integer[5];
            for (int j = 0; j < 5; j++) {
                array[j] = i * k * (j + 1);
            }
            k++;
            stack.push(array);
        }
    }

    public Stack<Integer[]> getStack() {
        return stack;
    }
}

Explanation

I have a MyStack class that has a Stack. It could be any data structure like an array even, but I chose to use a Stack because I can just .pop() it. And the get the Integer[].
I instantiate that class in the GUI class
I then extract that Stack. Keep in mind the Stack holds Integer[]'s
As i explained, you want to add a single dimension array to the model.
So every time I click the button, an Integer[] is pulled out of the Stack, then I just add that array to the model as a row.

Hello thanks for this example, but what if I don't know what rows are to pass? Meaning I have another class, from their I have to pass array of string to this class? — neknek mouh, Jan 07 '14 at 09:52
It However you get that data, just `model.addRow(a single Dim array)` — Paul Samsotha, Jan 07 '14 at 09:56
Create an instance of that class in the GUI class and extract the data from it — Paul Samsotha, Jan 07 '14 at 09:57
By the way can you explain those lines of codes to me? thanks — neknek mouh, Jan 07 '14 at 10:52

score 1 · Answer 2 · answered Jan 07 '14 at 09:32

1

But when I pressed the start button, it's not filling the row. What am I doing wrong in here?

your code inside ActionListener missing any code to addRow to JTable or to DefaultTableModel (table.getModel....)
in the case that you are using DefaultTableModel doesn't matter if is row added to JTable or DefaultTableModel
don't to use NullLayout in Swing, Swing is designated to be laid by using LayoutManager

answered Jan 07 '14 at 09:32

mKorbel

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How do you know that I'm using NullLayout? – neknek mouh Jan 07 '14 at 09:39
Because for the sake of my example I use AbsoluteLayout – neknek mouh Jan 07 '14 at 09:49

java pass data to JTable's row upon button click

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