Bonjour ,
Je ne comprend pas pourquoi javac me dit qu'il y a une erreur sur ma boucle for

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JPanel;
 
 
 
 
public class TestMaclasse extends JApplet {
	private JPanel panelDeBoutons;
	private JButton augmenterPierre;
	private JButton reduireAngle;
	private JButton augmenterAngle;
	private JButton deplacerVite;
	private JButton deplacer;
	private JButton deplacerTresVite;
	private JButton DemiTour;
	private JButton predateur;
	private JPanel canvas;
	private JButton diminuerPierre;
	private ArrayList<Maclasse> listRectangles;
	private ArrayList<Chenille> ListEnnemi;
	 private Chenille maChenille  ;
	 boolean a;
	 int tailleRectangle=2;
	 int k=-tailleRectangle;
 
	private class Canvas extends JPanel {
		public Canvas() {
			super();
		}
 
		@Override
		public void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.drawRect(5,5,Cercle.xMax-5,Cercle.yMax-5);
		      maChenille.dessiner(g);
 
		      for (Chenille ennemi : ListEnnemi) {
					ennemi.dessiner(g);}
		      for (Maclasse pierre : listRectangles) {
				pierre.dessiner(g);
			for(int i=0;i<360;i++){
			g.drawLine((int)(pierre.getX()+pierre.getLargeur()/2 + maChenille.getGrandDiametreTete()*Math.cos(i*Math.PI/180)),(int)(pierre.getY()+pierre.getHauteur()/2+maChenille.getGrandDiametreTete()*Math.sin(i*Math.PI/180)
					),(int)(pierre.getX()+pierre.getLargeur()/2 +0.000001 + maChenille.getGrandDiametreTete()*Math.cos(i*Math.PI/180)),(int)(pierre.getY()+pierre.getHauteur()/2+maChenille.getGrandDiametreTete()*Math.sin(i*Math.PI/180)) );
			}}
		}
	}
	public TestMaclasse() {
		listRectangles = new ArrayList<Maclasse>();
 
			}
	public void InitTabBoolean( boolean k []) {for(int i=0;i<k.length;i++){k[i]=false;}}
 
	public void IsRencontre(){
										for(Maclasse pierre : listRectangles){System.out.println(maChenille.getXTete()-pierre.getX()+pierre.getLargeur()/2);
										System.out.print(maChenille.getYTete()-pierre.getY()+pierre.getHauteur()/2);
										{
												if((maChenille.getXTete()-pierre.getX()+pierre.getLargeur()/2)*(maChenille.getXTete()-pierre.getX()+pierre.getLargeur()/2)+(maChenille.getYTete()-pierre.getY()+pierre.getHauteur()/2)*(maChenille.getYTete()-pierre.getY()+pierre.getHauteur()/2) 
														<=maChenille.getGrandDiametreTete()*maChenille.getGrandDiametreTete()
													)
													{
														maChenille.setCapTete(maChenille.getCapTete()+180);System.out.println(true);}
											}}}
 
 
 
 
 
 
	@Override
	public void init() {
		setSize(500, 500);
		setLayout(new BorderLayout());
		panelDeBoutons = new JPanel();
		panelDeBoutons.setLayout(new FlowLayout(FlowLayout.CENTER));
		 maChenille = new Chenille(15,10,45,Color.blue);
 
 
		augmenterPierre = new JButton("+ Pierre");
		augmenterPierre.addActionListener(new ActionListener(){
			@Override
			public void actionPerformed(ActionEvent e) {
														Maclasse rect = new Maclasse();
														rect.setX((int) (Math.random() * 500));
														rect.setY((int) (Math.random() * 500));
														rect.setHauteur(2);
														rect.setLargeur(2);
														rect.setColor(Color.BLACK);
														listRectangles.add(rect);
														canvas.repaint();}
									                          }
	                                                 );
 
 
		panelDeBoutons.add(augmenterPierre);
 
 
			diminuerPierre = new JButton("- Pierre");
			diminuerPierre.addActionListener(new ActionListener(){
				@Override
				public void actionPerformed(ActionEvent e) {
														if(listRectangles.size()>0){
															listRectangles.remove(listRectangles.size()-1);
															canvas.repaint();}
										                          }}
		                                                 );
 
 
			panelDeBoutons.add(diminuerPierre);
		reduireAngle = new JButton("-");
		reduireAngle.addActionListener(new ActionListener(){
@Override
				public void actionPerformed(ActionEvent e) {if(maChenille.getAngleDeVision()>0) {maChenille.setAngleDeVision((maChenille.getAngleDeVision())-5) ; canvas.repaint();}}}
 
 
		);
panelDeBoutons.add(reduireAngle);
 
 
		augmenterAngle = new JButton("+");
		augmenterAngle.addActionListener(new ActionListener()         {
																public void actionPerformed(ActionEvent e) {
																	if (maChenille.getAngleDeVision()<180){maChenille.setAngleDeVision((maChenille.getAngleDeVision())+5) ;
			                                                                             repaint();}
																	                                       }
							            });
		panelDeBoutons.add(augmenterAngle);
 
 
		deplacer = new JButton("GO");
		deplacer.addActionListener(new ActionListener()    {
														      	public void actionPerformed(ActionEvent e) {	
														      		IsRencontre();
														      		maChenille.deplacer();canvas.repaint();
		}});
		panelDeBoutons.add(deplacer);
 
 
		deplacerVite = new JButton("GOO");
		deplacerVite.addActionListener(new ActionListener()       {
																	public void actionPerformed(ActionEvent e)            
																	      {for(int i=0 ; i<5 ; i++) {IsRencontre();
																	    	  maChenille.deplacer();{;}canvas.repaint() ;}}
		});
		panelDeBoutons.add(deplacerVite);
 
 
		deplacerTresVite = new JButton("GOO");
		deplacerTresVite.addActionListener(new ActionListener()  {
																	public void actionPerformed(ActionEvent e) 
																	      {for(int i=0 ; i<10 ; i++) {IsRencontre();
																    	  maChenille.deplacer();{;}canvas.repaint() ;}
																	      }});
		panelDeBoutons.add(deplacerTresVite);
 
 
		DemiTour = new JButton("Demi tour");
		DemiTour.addActionListener(new ActionListener(){
@Override
				public void actionPerformed(ActionEvent e) {maChenille.setCapTete(maChenille.getCapTete()+180);maChenille.deplacer(); canvas.repaint();}}
 
 
		);
panelDeBoutons.add(DemiTour);
 
 
predateur = new JButton("+ predateur");
predateur.addActionListener(new ActionListener(){
@Override
		public void actionPerformed(ActionEvent e) { 
	Chenille ennemi = new Chenille(0, 10, 45, Color.RED);
	ennemi.setLongeur(0);ennemi.setAngleDeVision(45);
 
													 ListEnnemi.add(ennemi);
													 canvas.repaint();}}
 
 
);
panelDeBoutons.add(predateur);
		{
 
		canvas = new Canvas();
		canvas.setBackground(Color.WHITE);
		add(panelDeBoutons, BorderLayout.NORTH);
		add(canvas, BorderLayout.CENTER);
		invalidate();
		validate();
 
	}}
	}

l'erreur est :
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Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
	at TestMaclasse$Canvas.paintComponent(TestMaclasse.java:46)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JLayeredPane.paint(Unknown Source)
	at javax.swing.JComponent.paintChildren(Unknown Source)
	at javax.swing.JComponent.paintToOffscreen(Unknown Source)
	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
	at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
	at javax.swing.RepaintManager.paint(Unknown Source)
	at javax.swing.JComponent.paint(Unknown Source)
	at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
	at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
	at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
	at java.awt.Container.paint(Unknown Source)
	at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.access$700(Unknown Source)
	at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$000(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
Merci d'avance