Erreur dans un for arrayList
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
