Text position in a cell in JTable?

Question

hello experts!!
how can i center(horizontal) position/left/right justified a text in a cell in JTable?
plz help.. tnx in advance!

Answer 1

kagaw3000 wrote:
ok i got it!
But i am really confuse in JTable tutorial. it uses JLable as a CellRenderer and JButton as a CellEditor
then it returns a Color.
for clarification, when i am editing a cell, CellEditor will takes place, right? and when customizing the display of a cell, CellRendere will takes place, right?
There is a very good explanation at the beginning of the Concepts: Editors and Renderers section in the tutorial.
can you show me code that get and return a String not a Color.class?The default editor GenericEditor of JTable uses a JTextField which returns a String:
static class GenericEditor extends DefaultCellEditor {
    Class[] argTypes = new Class[]{String.class};
    java.lang.reflect.Constructor constructor;
    Object value;
    public GenericEditor() {
        super(new JTextField());
        getComponent().setName("Table.editor");
    public boolean stopCellEditing() {
        String s = (String)super.getCellEditorValue();
        // Here we are dealing with the case where a user
        // has deleted the string value in a cell, possibly
        // after a failed validation. Return null, so that
        // they have the option to replace the value with
        // null or use escape to restore the original.
        // For Strings, return "" for backward compatibility.
        if ("".equals(s)) {
            if (constructor.getDeclaringClass() == String.class) {
                value = s;
            super.stopCellEditing();
        try {
            value = constructor.newInstance(new Object[]{s});
        catch (Exception e) {
            ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));
            return false;
        return super.stopCellEditing();
    public Component getTableCellEditorComponent(JTable table, Object value,
            boolean isSelected,
            int row, int column) {
        this.value = null;
        ((JComponent)getComponent()).setBorder(new LineBorder(Color.black));
        try {
            Class type = table.getColumnClass(column);
            // Since our obligation is to produce a value which is
            // assignable for the required type it is OK to use the
            // String constructor for columns which are declared
            // to contain Objects. A String is an Object.
            if (type == Object.class) {
                type = String.class;
            constructor = type.getConstructor(argTypes);
        catch (Exception e) {
            return null;
        return super.getTableCellEditorComponent(table, value, isSelected, row, column);
    public Object getCellEditorValue() {
        return value;
}