使用＆＃34; collisionWithPlayer＆＃34;时，碰撞无效。

Question

出于某种原因，curAlien和battleShip之间的碰撞不会发生。这是他们的代码片段。我无法决定使用boolean collisionWithPlayer，或使用访问器，（如果我使用访问器，我会收到错误说明（ax无法解析或不是字段）

      for (i = 0; i < alienHorde.size (); i++)
      {
        Alien curAlien = alienHorde.get(i);
        curAlien.act();
        if (battleShip.collisionWithPlayer(curAlien)) 
       // if ((badAlien.getX().ax + alienWidth) == battleShip.getX().sx &&      badAlien.getX().ax <= (battleShip.get().sx + shipWidth) && 
          //(badAlien.getY().ay + alienHeight) == battleShip.getY().sy && badAlien.getY().ay <= (battleShip.getY().sy + shipHeight))
        {
          health=health-10;
          alienHorde.remove(i);
        }

这是完整的代码

Ship battleShip;
Alien badAlien;
ArrayList <Alien> alienHorde;
ArrayList <Missile> missiles;
int firstAlienX = 30;
int firstAlienY = -65;
final int alienOffset = 110;
final int alienWidth = 64;
final int alienHeight = 80;
final int shipWidth = 64;
final int shipHeight = 64;
PImage alien;
PImage ship;
PImage missile;
int health = 100;
int bCount = 0;
//int enemies = 0;
int b;
int i;

void setup()
{
  size(1000, 500);
  ship = loadImage("ship.png");
  alien = loadImage("ghost.png");
  missile = loadImage("missile.gif");
  battleShip = new Ship();
  frameRate(1000);
  missiles = new ArrayList<Missile>();
  alienHorde = new ArrayList<Alien>();
  for (int a = 0; a<12; a++)
  {
    alienHorde.add(new Alien(firstAlienX + a * alienOffset, firstAlienY));
    //enemies++;
  }
}

void mousePressed()
{
  missiles.add(new Missile());
  //bCount++;
}

void draw()
{
  background(0);
  battleShip.draw(); 
  for (Alien badAlien : alienHorde)
  {
    badAlien.act();
    badAlien.draw();
  }

  for (i = 0; i < alienHorde.size (); i++)
  {
    Alien curAlien = alienHorde.get(i);
    curAlien.act();
    if (battleShip.collisionWithPlayer(curAlien)) 
   // if ((badAlien.getX().ax + alienWidth) == battleShip.getX().sx && badAlien.getX().ax <= (battleShip.get().sx + shipWidth) && 
      //(badAlien.getY().ay + alienHeight) == battleShip.getY().sy && badAlien.getY().ay <= (battleShip.getY().sy + shipHeight))
    {
      health=health-10;
      alienHorde.remove(i);
    }


    for (b = 0; b < missiles.size (); b++)
    {
      Missile curMissile = missiles.get(b);
      curMissile.act();
      if (curMissile.collides(alienHorde.get(i)))
      {
        alienHorde.remove(i);
        missiles.remove(b);
        i--;
      }
    }
  }
  text("Health: " + health, 20, 65);
}





public class Alien
{
  int ax;
  int ay;
  int xVelocity;
  int yVelocity;

  Alien(int axIn, int ayIn)
  {
    ax = axIn;
    ay = ayIn;
    xVelocity = -1;
    yVelocity = 0;
    draw();
  }
  void draw()
  {
    image(alien, ax, ay, 64, 64);
  }
  void act()
  {
    ax+=xVelocity;
    if (ax+alienWidth >= width || ax < 0)
    {
      xVelocity*=-1;
      ay=ay+alienHeight;
    }
  }

  int getX()
  {
    return ax;
  }
  int getY()
  {
    return ay;
  }
}



public class Missile
{
  int mx;
  int my;
  int yVelocity = -1;
  Missile()
  {
    mx = mouseX-15;
    my = 330;
    draw();
  }
  void draw()
  {
    image(missile, mx, my, 30, 70);
  }
  void act()
  {
    my+=yVelocity;     
    draw();
  }
  boolean collides(Alien x)
  {
    if ( mx >= x.ax && mx <= x.ax + alienWidth && my >= x.ay && my <= x.ay + alienHeight)
      return true;
    else
      return false;
  }
}


public class Ship
{
  int sx = 30;
  int sy = 75;
  Ship()
  {
    draw();
  }
  void draw()
  {
    image(ship, mouseX-32, 400, 64, 64);
  }
  /*
  int getX()
  {
    return sx;
  }
  int getY()
  {
    return sy;
  }
*/

  boolean collisionWithPlayer(Alien aenemy)
  {
    if ((aenemy.ax + alienWidth) == sx && aenemy.ax <= (sx + shipWidth) 
      && (aenemy.ay + alienHeight) == sy && aenemy.ay <= (sy + shipHeight))
    {
      return true;
    }
      return false;
     }
}