How to select all text in JTable cells during editing

Posted by jl5501 on Mon, 07 Mar 2022 03:16:45 +0100

Introduction: This article mainly introduces how to select all text in JTable cell and relevant experience and skills during editing. The article has about 6721 words, 194 views and 7 likes, which is worthy of recommendation!

I want the editor in my editable JTable to select all the text in the cell when I start editing. I tried some things, all around from tablecelleditor JTextComponent is called on the component returned by gettablecelleditorcomponent method selectAll(). Nothing I've tried.

In my recent attempt, I changed the SimpleTableDemo class in the Swing tutorial to use a custom TableCellEditor that calls the selectAll method. In the debugger, I can see that the selectAll () method is being called, but the table still goes into edit mode without selecting the text in the cell (or maybe clearing the selection before displaying). The code is as follows. Who can tell me what went wrong?

import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.text.JTextComponent;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;

    public SimpleTableDemo() {
        super(new GridLayout(1, 0));

        String[] columnNames = {"First Name",
                                "Last Name",
                                "# of Years",

        Object[][] data = {
                {"Kathy", "Smith", "Snowboarding", new Integer(5), new Boolean(false)},
                {"John", "Doe", "Rowing", new Integer(3), new Boolean(true)},
                {"Sue", "Black", "Knitting", new Integer(2), new Boolean(false)},
                {"Jane", "White", "Speed reading", new Integer(20), new Boolean(true)},
                {"Joe", "Brown", "Pool", new Integer(10), new Boolean(false)}

        final JTable table = new SelectingTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));

        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.

    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();

        System.out.println("Value of data: ");
        for (int i = 0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j = 0; j < numCols; j++) {
                System.out.print("  " + model.getValueAt(i, j));

     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");

        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque

        //Display the window.

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {

    class SelectingTable extends JTable {
        public SelectingTable(Object[][] data, String[] columnNames) {
            super(data, columnNames);
            TableColumnModel model = super.getColumnModel();
            for (int i = 0; i < super.getColumnCount(); i++) {
                TableColumn tc = model.getColumn(i);
                tc.setCellEditor(new SelectingEditor(new JTextField()));

        class SelectingEditor extends DefaultCellEditor {

            public SelectingEditor(JTextField textField) {

            public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
                Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
                if (c instanceof JTextComponent) {
                    JTextComponent jtc = (JTextComponent) c;
                return c;


Table Select All Editor It should suit you. It is the preferred solution, so you do not need to continue creating custom editors. This is a column containing integers. Only integers should be accepted. With your current code

Part of your code works. If you use the F2 key to start editing, select the text. However, when you use the mouse and double-click a cell, a second mouse event is passed to the editor to place the caret where you clicked, which removes the selection. The solution is:

final JTextComponent jtc = (JTextComponent)c;
SwingUtilities.invokeLater(new Runnable()
    public void run()


public class SelectAllCellEditor extends DefaultCellEditor
    public SelectAllCellEditor(final JTextField textField ) {
        super( textField );
        textField.addFocusListener( new FocusAdapter()
            public void focusGained( final FocusEvent e )
        } );

JTable can have many different components in a cell. When editing, it is usually JTextField. You need to get the field first and then select. You can get the length of text through processing mode. This code should get you started, and you may want to put it in the List selection handler. Namely.

 ListSelectionModel rowSM = this.getSelectionModel();
 rowSM.addListSelectionListener(new ListSelectionListener() {
    public void valueChanged(ListSelectionEvent e){
       DefaultCellEditor ed = (DefaultCellEditor)this.getCellEditor();
       JTextField jf = (JTextField)ed.getComponent();, *text.length()*);

It is worth noting that you need to find text length(). It could be something like this:

this.getModel().getValueAt(this.getSelectedRow(), this.getSelectedColumn()).length();

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