Getting ClassCastException When Trying To Color JTable Row?

Question

hi there
i'm trying to set color for JTable Rows Using the method prepareRenderer
and get the values of the second column which contains integer values
and if it contain 0 integer value set the color row as red
its already works and the row with 0 is set to red but when i try to select any cell in the table
i'm getting
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integerat prepareRenderer
although the second row which i'm trying to test it's values is Integer not String????????????
here's the code:
import javax.swing.border.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.JFrame;
public class Column_Filter {
  static JTable table;
static DefaultTableModel dtm;  
    public static void main(String[] args) {
         String[]columns={"Name","Number","Price"};
         Object[][]data={  {"a",new Integer(5),new Integer(200)}
         ,{"b",new Integer(7),new Integer(400)}
         ,{"c",new Integer(0),new Integer(100)}
         ,{"d",new Integer(8),new Integer(800)}
         ,{"e",new Integer(3),new Integer(300)}         
         dtm=new DefaultTableModel(data,columns);
                    table=new JTable(dtm){
                  public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
                         public Component prepareRenderer(TableCellRenderer renderer, int row, int column)
                    Component c = super.prepareRenderer(renderer, row, column);
                    if (!c.getBackground().equals(getSelectionBackground()))
                         Integer type = (Integer)getModel().getValueAt(row, 1);
                         if(type!=null)                                                            
                         c.setBackground(type==0 ? Color.RED : Color.WHITE );
                    else
                    c.setBackground(Color.white);
                    return c;
         TableColumnModel columnModel = table.getColumnModel();
         TableColumn col1 = columnModel.getColumn(1);         
         col1.setCellEditor(new TableEditor());
         TableColumn col2 = columnModel.getColumn(2);
         col2.setCellEditor(new TableEditor());
         table.setPreferredScrollableViewportSize(new Dimension(280,160));
         JScrollPane scroll=new JScrollPane(table);
         JLabel label=new JLabel("Column Stuff",JLabel.CENTER);
         JPanel panel=new JPanel();
         panel.add(scroll);
        JFrame frame=new JFrame("Column Stuff");
        frame.add(label,BorderLayout.NORTH);
        frame.add(panel,BorderLayout.CENTER);
        frame.setSize(300,300);
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
             table=new JTable();     
               table.setModel(new DefaultTableModel(new Object [][][] {},new String [] {"Name", "Number","Price"}) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.String.class,java.lang.String.class
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
      class TableEditor extends DefaultCellEditor
          TableEditor()
               super( new JTextField() );               
            setClickCountToStart(0);
          public boolean stopCellEditing()
                    String editingValue = (String)getCellEditorValue();
                if(!editingValue.equals("")){
             try
            int i = Integer.parseInt(editingValue);
            catch(NumberFormatException nfe)
            ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));       
            getComponent().requestFocusInWindow();      
            JOptionPane.showMessageDialog(null,"Data Input Error","Error",JOptionPane.ERROR_MESSAGE);
            return false;          
                else{                                             
                 getComponent().requestFocusInWindow();
                 fireEditingCanceled();
                 JOptionPane.showMessageDialog(null,"Data Input Error","Error",JOptionPane.ERROR_MESSAGE);
              return false;              
               return super.stopCellEditing();
               public Component getTableCellEditorComponent(
               JTable table, Object value, boolean isSelected, int row, int column)
               Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
               ((JComponent)c).setBorder(new LineBorder(Color.BLACK));
               return c;
     }

Answer 1

hi again camickr
i changed the stopCellEditing as you mentioned
changed the getCellEditorValue to return an integer
and give exception and error message if the value can't be converted into integer(non numeric)
but the problem is when i run the program and change the value in any cell with numeric values
or with non numeric or not changing the value and press enter
it give the error message meaning it cannot convert the value to integer
even if enter an int or don't change the value ????????
here's what i did
import javax.swing.border.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.JFrame;
public class Column_Filter {
  static JTable table;
static DefaultTableModel dtm;  
    public static void main(String[] args) {
         String[]columns={"Name","Number","Price"};
         Object[][]data={  {"a",new Integer(5),new Integer(200)}
         ,{"b",new Integer(7),new Integer(400)}
         ,{"c",new Integer(0),new Integer(100)}
         ,{"d",new Integer(8),new Integer(800)}
         ,{"e",new Integer(3),new Integer(300)}         
         dtm=new DefaultTableModel(data,columns);
                    table=new JTable(dtm){
                  public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
                         public Component prepareRenderer(TableCellRenderer renderer, int row, int column)
                    Component c = super.prepareRenderer(renderer, row, column);
                    if (!c.getBackground().equals(getSelectionBackground()))
                         Integer type = (Integer)getModel().getValueAt(row, 1);                                                            
                         c.setBackground(type==0 ? Color.RED : Color.WHITE );
                    return c;
         TableColumnModel columnModel = table.getColumnModel();
         TableColumn col1 = columnModel.getColumn(1);         
         col1.setCellEditor(new TableEditor());
         TableColumn col2 = columnModel.getColumn(2);
         col2.setCellEditor(new TableEditor());
         table.setPreferredScrollableViewportSize(new Dimension(280,160));
         JScrollPane scroll=new JScrollPane(table);
         JLabel label=new JLabel("Column Stuff",JLabel.CENTER);
         JPanel panel=new JPanel();
         panel.add(scroll);
        JFrame frame=new JFrame("Column Stuff");
        frame.add(label,BorderLayout.NORTH);
        frame.add(panel,BorderLayout.CENTER);
        frame.setSize(300,300);
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
             table=new JTable();     
               table.setModel(new DefaultTableModel(new Object [][][] {},new String [] {"Name", "Number","Price"}) {
            Class[] types = new Class [] {
                java.lang.String.class, java.lang.Integer.class,java.lang.Integer.class
            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
      class TableEditor extends DefaultCellEditor
          TableEditor()
               super( new JTextField() );               
            setClickCountToStart(0);
          public boolean stopCellEditing()
               try
                    Integer editingValue = (Integer)getCellEditorValue();
               catch(ClassCastException exception)
           //when i enter any value in any cell this code is executed even i enter an int or don't change the value
            ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));       
            getComponent().requestFocusInWindow();      
            JOptionPane.showMessageDialog(null,"Data Input Error","Error",JOptionPane.ERROR_MESSAGE);
            return false;
               return super.stopCellEditing();
               public Component getTableCellEditorComponent(
               JTable table, Object value, boolean isSelected, int row, int column)
               Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
               ((JComponent)c).setBorder(new LineBorder(Color.BLACK));
               return c;
     }