Не работает Timer, почему? - Java

Формулировка задачи:

Доброго времени суток. Никак не могу понять в чем проблема с моим таймером. Пишу на swing (так вышло). При нажатии на кнопку вылазит такая серия ошибок. Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at deadplom.DEAD$18.actionPerformed(DEADPLOM.java:306) at javax.swing.Timer.fireActionPerformed(Timer.java:313) at javax.swing.Timer$DoPostEvent.run(Timer.java:245) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

                    Листинг программы
                
 
                            
                        
   
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;
 
@SuppressWarnings("uncheked")
   
    Timer t1;
    int i=0;
    //private JButton button;
    private JLabel label;
    private void Timer1ActionPerformed(java.awt.event.ActionEvent evt) {                                       
 
        t1 = new Timer(1000, new ActionListener() {
            
            @Override
            public void actionPerformed(ActionEvent e) {
 
               label.setText("text :" + i);
               i++;
            }
        });
        t1.start();
 
    }                                      
}
    private void StopTimer1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
        t1.stop();
 
    public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DEAD().setVisible(true);
 }
        });
    }

Решение задачи: «Не работает Timer, почему?»

textual
                            Листинг программы 
                        
 
                        
                          
                    
stopTimerButton.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent event) {
      timer.stop();
   }
}