iteration issue

public class MyWorld extends World
{
    List<Integer> xloclist = new ArrayList<Integer>();
    List<Integer> blockheightlist = new ArrayList<Integer>();
    private int calls = 0;

    //there is a filereader in between that loads integers into xloclist, but I omitted it here to save space

    public int xloc0(){
        return xloclist.get(0);
    }
    
    public int xlocmin(){
        return xloclist.get(Collections.min(xloclist));
    }
    
    //returns the current call count
    public int globalcalls(){
        return calls;
    }
    
    public int globalcallsup(){
        calls++;
        return calls;
    }
    
    public int globalcallreset(){
        calls = 0;
        return calls;
    }
}

public class SortingBar extends Actor
{
    private int calls = 0; //initialize call to act counter
    MyWorld myWorld = (MyWorld) getWorld(); //instantiate the world locally for easier access

    public void act(){
        //if n key is down and calls is 0 or over 25, then...
        if(Greenfoot.isKeyDown("n") && calls == 0 || Greenfoot.isKeyDown("n") && calls >25){
            //if this x location is 0 or if it is equal to the x location of the shortest block then...
            if(this.getX() == myWorld.xloc0() || this.getX() == myWorld.xlocmin()){ //this line is the problem child
                //turn the two boxes green.
                this.highlight();
            }
            //increment the call counters in the world and locally
            for(int i=0;i<25;i++){ 
                myWorld.globalcallsup(); //increment global call count
                calls++;//increment local call count
                System.out.println(myWorld.globalcalls()); //print out global call count(for debug)
                
            }
            myWorld.globalcallreset(); //reset the global call counter
            calls = 0; //reset the local call counter
        }
    }
}