Java SE (Java Platform, Standard Edition)

I wrote the following Code and strangely it isn't showing the column Names....
The mistake should be foolish..but i can't figure it out...

can you please help.. or give any alternate way to do the same

import javax.swing.*;
import javax.swing.table.*;
public class test
{
	public static String[] columnNames = {"User Name","User ID"};
	public static void main(String args[])
	{
		JFrame frame = new JFrame();
		frame.setSize(400, 400);
		DefaultTableModel tabmodel = new DefaultTableModel(columnNames, 15);
		JTable table = new JTable(tabmodel);
		frame.add(table);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
}