AABB Code

// Map.java

public List<BoundingBox> getBoundingBoxes() {
	List<BoundingBox> boxes = new ArrayList<BoundingBox>();

	int i, j;
	for(int x = 0; x < this.size.x; x++) {
		for(int y = 0; y < this.size.y; y++) {
			if(this.getTile(x, y).collide()) {
				boxes.add(new BoundingBox(new Vec2(i = x * 16, j = y * 16), new Vec2(i + 16, j + 16)));
			}
		}
	}
	return boxes;
}

// Player.java

public void handleInput() {
	BoundingBox last = this.pos.clone();
	if(Keys.A.state) {
		this.pos.offset(new Vec2(-1, 0));
	}
	if(Keys.D.state) {
		this.pos.offset(new Vec2(1, 0));
	}
	if(Keys.W.state) {
		this.pos.offset(new Vec2(0, -1));
	}
	if(Keys.S.state) {
		this.pos.offset(new Vec2(0, 1));
	}
	List<BoundingBox> boxes = Crawler.INSTANCE.map.getBoundingBoxes();
	for(BoundingBox box : boxes) {
		box.collide(last, this.pos);
	}
}