Add an ArrayList to another ArrayList

Processing Coding Questions
10

so i found a “solution” and its work:

	public void grow(Grass g){
		int totalchamp = 50;
		//champi.addAll((new Grass(parent, position)).grass);
		while(champi.size() < totalchamp){
			PVector champis = new PVector();
			champis.x = parent.random(250, 1750);
			champis.y = parent.random(250, 1750);
			boolean overlapping = false;
			for(int i = 0; i < champi.size(); i++){
				PVector other = champi.get(i);
				float d = PApplet.dist(champis.x, champis.y, other.x, other.y);
				if(d < 32){
					overlapping = true;
					break;
				}
			}
			ArrayList<PVector> grass = g.getGrass();
			for(int a = 0; a < grass.size(); a++){
				PVector other = grass.get(a);
				float d = PApplet.dist(champis.x, champis.y, other.x, other.y);
				if(d < 32){
					overlapping = true;
					break;
				}
			}
			if(!overlapping){
				champi.add(champis);
			}
		}
	}

i call the grass list and then i check if its overlapp.
But i wonder, is it a good way ?