How can I add two jTextFields to JTable cell on button click

Question

I have a JTable, edit button and save button. when I click the edit button , I want to insert two JTextFields into a particular cell which is selected . So I can write (strings) into these text fields . when I click on save button want to remove those two textfields from the cell and paste that strings (into the same cell of the table).

Answer 1

You don't need to add a JTextField to a JTable in order for a cell to be editable. The isCellEditable(int row, int column) function can be overridden to return a boolean dependent on the edit button. Here's an example:

import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.EventQueue;
import java.awt.event.*;
import java.awt.Dimension;

public class EditTableExample extends JFrame {
    private boolean editable = false;
    public EditTableExample() {
        //set up jframe
        setPreferredSize(new Dimension(500, 500));
        setMinimumSize(new Dimension(500, 500));
        setResizable(false);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        //set up content pane
        JPanel contentPane = new JPanel();
        setContentPane(contentPane);
        //table model
        Object[][] tableContents = new Object[][]{ //contents of our table
                {"Person1", "City1"},
                {"Person2", "City2"},
                {"Person3", "City3"}
        };
        Object[] tableHeader = new Object[]{
                "Name", "City"
        };
        DefaultTableModel model = new DefaultTableModel(tableContents, tableHeader) {
            @Override
            public boolean isCellEditable(int row, int column) {
                return editable;
            }
        };
        //table
        JTable table = new JTable(model);
        //scrollpane to house table
        JScrollPane tablePane = new JScrollPane(table);
        tablePane.setPreferredSize(new Dimension(450, 450));
        //button that will add a row
        JButton add = new JButton("Add Row");
        add.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                model.addRow(new Object[model.getColumnCount()]); //adds a new, empty row to the table
            }
        });
        //button that will toggle edit mode
        JButton edit = new JButton("Toggle Edit");
        edit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                editable = !editable; //switches the value of 'editable' on click
            }
        });
        //button to remove a row
        JButton remove = new JButton("Remove Row");
        remove.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                try {
                    model.removeRow(table.getSelectedRow()); //remove selected row
                }
                catch (ArrayIndexOutOfBoundsException e) {
                    JOptionPane.showMessageDialog(rootPane, "No Row Selected");
                }
            }
        });
        //add everything together
        contentPane.add(tablePane);
        contentPane.add(add);
        contentPane.add(edit);
        contentPane.add(remove);
    }
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                EditTableExample e = new EditTableExample();
                e.setVisible(true);
            }
        });
    }
}

As you can see, the isCellEditable function will return the value of 'editable', a boolean whose value is toggled by the 'edit' button. Instead of having one cell per person that contains "Name, City" there are two columns, one for the person's name and one for their city. Let me know if you have any other questions.