Exception in thread "main" java.lang.NullPointerException
        at Assist.<init>(Assist.java: 22 )
        at Assist.main(Assist.java: 35 )

mport java.awt.*;
 import  java.util.*;
 import  javax.swing.*;
 import  javax.swing.table.*;

 public   class  Raspisanie  extends  JFrame
{
	 public  DefaultTableModel dtm;  
	 public  String[] data[];
	 public  enum weekdays {mon,tue,wed,third,fri,sa,sund};
	 public  Raspisanie()
	{
		 super ("Raspisanie");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		

	dtm =  new  DefaultTableModel();
	dtm.setColumnIdentifiers( new  String[]{"Date","WD","Efimov","Ivanov","Ladvez"});		
	
	 for  ( int  i =  1 ; i <  32 ; i ++)
	{
		data[i] =  new  String[]{i + ".05.06","mon","22","0","0"};
		dtm.addRow(data[i]);
	}		
		
	JTable table =  new  JTable(dtm);
		
	getContentPane().add( new  JScrollPane(table));
	setSize( 300 , 300 );
	setVisible(true);
	}
	
	 public   static   void  main(String[] args)
	{
		 new  Raspisanie();
	}
}