Java - Poner bordes un JTable

import java.awt.*;

import javax.swing.*;

import javax.swing.border.Border;

import javax.swing.table.TableCellRenderer;

public class JTableColoredBorder extends Box{

    public JTableColoredBorder(){

        super(BoxLayout.Y_AXIS);

        JTable table = new JTable(5,5);

        table.setIntercellSpacing(new Dimension(0,0));//Get rid of cell spacing

        //Set your own renderer.  You'll have to set this for Number and Boolean too if you're using those

        CustomRenderer cr = new CustomRenderer(table.getDefaultRenderer(Object.class), Color.red, Color.orange, Color.pink, Color.magenta);

        table.setDefaultRenderer(Object.class, cr);

        add(table);

    }

    //Custom renderer - do what the natural renderer would do, just add a border

    public static class CustomRenderer implements TableCellRenderer{

        TableCellRenderer render;

        Border b;

        public CustomRenderer(TableCellRenderer r, Color top, Color left,Color bottom, Color right){

            render = r;

            //It looks funky to have a different color on each side - but this is what you asked

            //You can comment out borders if you want too. (example try commenting out top and left borders)

            b = BorderFactory.createCompoundBorder();

            b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(2,0,0,0,top));

            b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,2,0,0,left));

            b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,0,2,0,bottom));

            b = BorderFactory.createCompoundBorder(b, BorderFactory.createMatteBorder(0,0,0,2,right));

        }

        @Override

        public Component getTableCellRendererComponent(JTable table,

                Object value, boolean isSelected, boolean hasFocus, int row,

                int column) {

            JComponent result = (JComponent)render.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

            result.setBorder(b);

            return result;

        }

    }

    /**

     * @param args

     */

    public static void main(String[] args) {

        JFrame frame = new JFrame();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setContentPane(new JTableColoredBorder());

        frame.validate();

        frame.pack();

        frame.setVisible(true);

    }

}