Check The Collisions

[Luff]

Hello, I'm pretty new to Java, I used to use C++ and SDL before.
But anyway.

My problem is like this, I'm doing a Shmup and it all went well until, I were going to the collisions. I' using 2 CopyOnWriteArrayLists just like this:

CopyOnWriteArrayList<Bullet> Bullets = new CopyOnWriteArrayList<Bullet>();
CopyOnWriteArrayList<Square> Enemies = new CopyOnWriteArrayList<Square>();

It all went smooth creating them:

Bullet Bullet = new Bullet(Player.getX() + 4, Player.getY() - 8, 8);
Bullets.add(Bullet);

And drawing them:

for (Bullet bullets : Bullets) {
  B.setColor(Color.white);
  B.fillRect(bullets.getX(), bullets.getY(), bullets.getWidth(), bullets.getHeight());
}

But now for checking collisions between those two, Bullets and Enemies I have no AJD. I can't do one of those for loops, so I got no clue.

Plz help, and comment if you need more info.

[Norm]

I have no AJD

What is AJD?

checking collisions

Is a collision when the boundary of one object touches/crosses the boundary of another?

[Luff]

Oh, AJD = Idea - e;

I got these Rectangle things thats return a Rectangle which is called getBounds.
I've done collisions before like this:

if (me.getBounds().intersects(you.getBounds()) {

But that isn't working here.

[Norm]

English is the preferred language here. Lots of English as a second language posters.

that isn't working here

Can you explain?
How are the boundaries of the objects in question stored? The code you posted uses the fillRect() method which makes one think the objects are rectangles.

[Luff]

In my Two classes 'Square' n' 'Bullet' I've got these functions? Is it functions when they return something? Oh well, I uses something like this:

public Rectangle getBounds() {
  return new Rectangle(getX(), getY(), getWidth(), getHeight());
}

That isn't the problem I guess, the problem is that I don't know how to check the collision with only one of those two instances in the Bullets and Enemies.

[Norm]

problem is that I don't know how to check the collision with only one of those two instances

If you only have one instance of an object. Does mean there are no other objects and hence there can not be any collisions? Can you explain what you mean?

The gross way to check for collisions would be to go thru all the enemy's one by one and see it it collides with each bullet one by one.
Another way would be to only check the object(s) that moved to see if they have collided with something. No sense checking something that hasn't moved.

[Luff]

Yes, but via that for loop I only can check for instances thats out of the ArrayList. Äh, I got no idea how to explain it....

[Norm]

I got no idea how to explain it..

That makes it hard to make recommendations on how to do it.