Hey guys i am trying to solve the problem for 2 days now and dont know how to handle it. i tried to use an iterator also a copy ArrayList but it didnt solved my problem, below are my two relevant classes.I wanna check if my player is colliding with a gem and ig it is colliding then add the gem to item ArrayList and delete it from objects ArrayList.
<i>
package object;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import entity.Camera;
import entity.GameObject;
import entity.ObjectID;
import window.Animation;
import window.Game;
import window.Handler;
import window.Texture;
public class Player extends GameObject {
// bereite und höhe des Rechtecks der das Object umhüllt für Collisin in
// getBounds
private float width = 32, height = 64;
private float gravity = 0.02f;
Handler handler;
Texture tex = Game.getInstance();
private Animation playerA, playerD, playerW, playerS;
public Player(float x, float y, Handler handler, ObjectID id) {
super(x, y, id);
this.handler = handler;
playerW = new Animation(10, tex.playerW.get(1), tex.playerW.get(2));
playerS = new Animation(10, tex.playerS.get(1), tex.playerS.get(2));
playerA = new Animation(10, tex.playerA.get(1), tex.playerA.get(2));
playerD = new Animation(10, tex.playerD.get(1), tex.playerD.get(2));
score = 0;
}
public void playerMovement() {
x += velX;
y += velY;
if (jumping || falling) {
velY += gravity;
}
}
@Override
public void tick(ArrayList<GameObject> object) {
facingFigur();
playerMovement();
collision(object);
playerW.runAnimation();
playerS.runAnimation();
playerA.runAnimation();
playerD.runAnimation();
}
@Override
public void render(Graphics g) {
g.setColor(Color.BLUE);
if ((this.x > -Camera.getX() + Game.WIDTH) || (this.x < -Camera.getX() - 32)
|| (this.y > -Camera.getY() + Game.HEIGHT) || (this.y < -Camera.getY() - 32)) {
} else {
if (velX != 0 || velY != 0) {
switch (facing) {
case 1:
playerD.drawAnimation(g, (int) x, (int) y, 24, 32);
break;
case -1:
playerA.drawAnimation(g, (int) x, (int) y, 24, 32);
break;
case 2:
playerW.drawAnimation(g, (int) x, (int) y, 24, 32);
break;
case -2:
playerS.drawAnimation(g, (int) x, (int) y, 24, 32);
break;
}
} else {
switch (facing) {
case 1:
g.drawImage(tex.playerD.get(0), (int) x, (int) y, null);
break;
case -1:
g.drawImage(tex.playerA.get(0), (int) x, (int) y, null);
break;
case 2:
g.drawImage(tex.playerW.get(0), (int) x, (int) y, null);
break;
case -2:
g.drawImage(tex.playerS.get(0), (int) x, (int) y, null);
break;
}
}
}
}
// Collision
private void collision(List<GameObject> object) {
for (GameObject objectt : handler.objects) {
if (objectt.getID().equals(ObjectID.Tree) || objectt.getID().equals(ObjectID.Block)) {
if (getBoundsTOP().intersects(objectt.getBounds())) {
y = objectt.getY() + (height / 2);
velY = 0;
}
if (getBounds().intersects(objectt.getBounds())) {
y = objectt.getY() - height;
velY = 0;
} else {
}
if (getBoundsRIGHT().intersects(objectt.getBounds())) {
x = objectt.getX() - width;
}
if (getBoundsLEFT().intersects(objectt.getBounds())) {
x = objectt.getX() + width;
}
}
}
for (GameObject objectt : handler.objects) {
if(objectt.getID().equals(ObjectID.Gem)) {
if(getBoundsTOP().intersects(objectt.getBounds())) {
handler.collectedItems.add(objectt);
}
}
}
handler.objects.removeAll(handler.collectedItems);
}
public void facingFigur() {
if (velX < 0) {
facing = -1;
} else if (velX > 0) {
facing = 1;
}
if (velY < 0) {
facing = 2;
} else if (velY > 0) {
facing = -2;
}
}
public Rectangle getBounds() {
return new Rectangle((int) ((int) x + (width / 2) - width / 4), (int) ((int) y + (height / 2)), (int) width / 2,
(int) height / 2);
}
public Rectangle getBoundsTOP() {
return new Rectangle((int) ((int) x + (width / 4)), (int) y, (int) width / 2, (int) height / 2);
}
public Rectangle getBoundsRIGHT() {
return new Rectangle((int) ((int) x + width - 5), (int) y + 5, (int) 5, (int) height - 10);
}
public Rectangle getBoundsLEFT() {
return new Rectangle((int) x, (int) y + 5, (int) 5, (int) height - 10);
}
}
</i>
<i>
package window;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.Iterator;
import entity.GameObject;
import entity.ObjectID;
public class Handler {
public ArrayList<GameObject> objects = new ArrayList<GameObject>();
public ArrayList<GameObject> bullets = new ArrayList<GameObject>();
public ArrayList<GameObject> collectedItems= new ArrayList<GameObject>();
private GameObject tempObject;
public void tick() {
for (GameObject objectt : objects) {
objectt.tick(objects);
}
for (GameObject bulletss : bullets) {
bulletss.tick(bullets);
}
for (GameObject element : new ArrayList<GameObject>(bullets)) {
if (element.isVisible() == false) {
bullets.remove(element);
}
}
}
public void render(Graphics g) {
for (GameObject o : objects) {
o.render(g);
}
for (int i = 0; i < bullets.size(); i++) {
tempObject = bullets.get(i);
tempObject.render(g);
/**
* andere variante for(GameObject o: object){ o.render(g);
*/
}
}
public void addObject(GameObject object) {
this.objects.add(object);
}
public void addBullet(GameObject object) {
this.bullets.add(object);
}
public void removeObject(GameObject object) {
this.objects.remove(object);
}
public void removeAll() {
this.objects.clear();
}
public int sizeOfObject(ObjectID id) {
int count = 0;
for (GameObject object : objects) {
if (object.getID().equals(id)) {
count++;
}
}
return count;
}
// public void createLevel() {
//
// for (int xx = 0; xx < Game.WIDTH + 32; xx += 32)
//
// addObject(new Tree(xx, Game.HEIGHT - 32, ObjectID.Tree));
// for (int yy = 0; yy < Game.WIDTH + 32; yy += 32)
// addObject(new Tree(Game.HEIGHT + 166, yy, ObjectID.Tree));
// for (int zz = 0; zz < Game.WIDTH + 32; zz += 32)
// addObject(new Tree(Game.HEIGHT - 609, zz, ObjectID.Tree));
// for (int ww = 192; ww < Game.WIDTH - 256; ww += 32)
// addObject(new Tree(ww, Game.HEIGHT - 192, ObjectID.Tree));
//
// }
/*
* for (Iterator<String> iterator = list.iterator(); iterator.hasNext(); ) {
* String value = iterator.next(); if (value.length() > 5) { iterator.remove();
* } }
*/
}
</i>
<i>
Exception in thread "Thread-2" java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.next(Unknown Source)
at window.Handler.tick(Handler.java:19)
at window.Game.tick(Game.java:96)
at window.Game.run(Game.java:76)
at java.lang.Thread.run(Unknown Source)
</i>