How to give different Colour to Columns in JTable

Question

Hi,
I am using a JTable and entering Data into it. I want each column of the JTable to be in different colour. Kindly Help. Some example code will be very helpful.
Waiting Eagerly.....
My Code....
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.Window;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import javax.swing.*;
import java.util.Vector;
import java.awt.GridLayout;
import java.util.*;
import javax.swing.table.TableModel;
public class SummScr extends JPanel {
public JTable ProSerSumTable;
public String ColumnNames[];
public String dataValues[][];
//public Vector ProSerDet = new Vector();
//constructor
public SummScr(){     
super(new GridLayout(1,0));
createColumns();
createData();
TableModel ProSerTabMod = new AbstractTableModel(){
public int getColumnCount(){return ColumnNames.length; }
public int getRowCount(){return dataValues.length;}
public Object getValueAt(int row, int col){return dataValues[row][col]; }
public String getColumnName(int col){return ColumnNames[col];}
public Class getColumnClass(int col) {return getValueAt(0,col).getClass();}
public void setValueAt(Object aValue, int row, int col){dataValues[row][col] = (String)aValue; }
ProSerSumTable = new JTable(ProSerTabMod);
ProSerSumTable.setPreferredScrollableViewportSize(new Dimension(400,200));
JScrollPane scrollpane = new JScrollPane(ProSerSumTable);
//JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
//scrollpane.add(ProSerSumTable);
add(scrollpane);
public void createColumns(){
ColumnNames = new String[4];
ColumnNames[0] = "Processes";
ColumnNames[1] = "Normal Threshold";
ColumnNames[2] = "On Hold";
ColumnNames[3] = "Exceeded Threshold";
public void createData(){
dataValues = new String[3][4];
dataValues[0][0] = "Merit";
dataValues[0][1] = "60%";
dataValues[0][2] = "0%";
dataValues[0][3] = "40%";
dataValues[1][0] = "SuperMarket";
dataValues[1][1] = "70%";
dataValues[1][2] = "0%";
dataValues[1][3] = "30%";
dataValues[2][0] = "Passport";
dataValues[2][1] = "65%";
dataValues[2][2] = "0%";
dataValues[2][3] = "35%";
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("Summary Screen");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
SummScr newContentPane = new SummScr();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
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() {
createAndShowGUI();
}

Answer 1

try this, also put your code into the code tags to help read your code
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;
public class SummScr extends JPanel {
     private static final long serialVersionUID = 1L;
     public JTable ProSerSumTable;
     public String ColumnNames[];
     public String dataValues[][];
     // public Vector ProSerDet = new Vector();
     // constructor
     public SummScr() {
          super(new GridLayout(1, 0));
          createColumns();
          createData();
          TableModel ProSerTabMod = new AbstractTableModel() {
               private static final long serialVersionUID = 1L;
               public int getColumnCount() {
                    return ColumnNames.length;
               public int getRowCount() {
                    return dataValues.length;
               public Object getValueAt(int row, int col) {
                    return dataValues[row][col];
               public String getColumnName(int col) {
                    return ColumnNames[col];
               public Class<?> getColumnClass(int col) {
                    return getValueAt(0, col).getClass();
               public void setValueAt(Object aValue, int row, int col) {
                    dataValues[row][col] = (String) aValue;
          ProSerSumTable = new JTable(ProSerTabMod);
          TableColumn tc = null;
//next line sets the renderer to your columns, in this example there are only four columns so its fairly easy,
//though it should be no harder no matter how many columns
          for(int i = 0; i < 4; i++){
               tc = ProSerSumTable.getColumnModel().getColumn(i);
               tc.setCellRenderer(new ColumnColourRenderer());
          ProSerSumTable.setPreferredScrollableViewportSize(new Dimension(400,
                    200));
          JScrollPane scrollpane = new JScrollPane(ProSerSumTable);
          // JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
          // scrollpane.add(ProSerSumTable);
          add(scrollpane);
     public void createColumns() {
          ColumnNames = new String[4];
          ColumnNames[0] = "Processes";
          ColumnNames[1] = "Normal Threshold";
          ColumnNames[2] = "On Hold";
          ColumnNames[3] = "Exceeded Threshold";
     public void createData() {
          dataValues = new String[3][4];
          dataValues[0][0] = "Merit";
          dataValues[0][1] = "60%";
          dataValues[0][2] = "0%";
          dataValues[0][3] = "40%";
          dataValues[1][0] = "SuperMarket";
          dataValues[1][1] = "70%";
          dataValues[1][2] = "0%";
          dataValues[1][3] = "30%";
          dataValues[2][0] = "Passport";
          dataValues[2][1] = "65%";
          dataValues[2][2] = "0%";
          dataValues[2][3] = "35%";
     private static void createAndShowGUI() {
          // Make sure we have nice window decorations.
          JFrame.setDefaultLookAndFeelDecorated(true);
          // Create and set up the window.
          JFrame frame = new JFrame("Summary Screen");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          // Create and set up the content pane.
          SummScr newContentPane = new SummScr();
          newContentPane.setOpaque(true); // content panes must be opaque
          frame.setContentPane(newContentPane);
          // Display the window.
          frame.pack();
          frame.setVisible(true);
     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() {
                    createAndShowGUI();
     class ColumnColourRenderer extends DefaultTableCellRenderer{
          public ColumnColourRenderer() {
               super();
          public Component getTableCellRendererComponent(JTable table, Object value,
                    boolean isSelected, boolean cellHasFocus, int row, int column) {
               if (column %2 == 0) {
                    setText((table.getModel().getValueAt(row, column)).toString());
                    if (isSelected) {
                          setBackground(table.getSelectionBackground());
                          setForeground(table.getSelectionForeground());
                    else {
                         setBackground(Color.RED);
               } else if (column %2 != 0){
                    setText((table.getModel().getValueAt(row, column)).toString());
                    if (isSelected) {
                          setBackground(table.getSelectionBackground());
                          setForeground(table.getSelectionForeground());
                    else {
                         setBackground(Color.BLUE);
               return this;
}