[FIXED] Exception in thread "main" java.lang.IndexOutOfBoundsException: Source does not fit in dest

Issue

I have Object:

static class Truck {
    
    ArrayList<Integer> route = new ArrayList<Integer>();
    double weight = 0;
    int route_weight = 0;

    Truck() {
    }

    Truck(ArrayList<Integer> route) {
        Collections.copy(this.route, route);
    }
    
    //getters and setters
}

Objects pulling into this list:

static ArrayList<Truck> trucks=new ArrayList<Trucks>();

I'm trying to make a full copy of the list:

        ArrayList<Truck> copy=new ArrayList<>();
        copy=cloneList(trucks);

    public static ArrayList<Truck> cloneList(ArrayList<Truck> trucksList) {
        ArrayList<Truck> clonedList = new ArrayList<Truck>();
        for (Truck truck : trucks) {
            Truck w=new Truck(truck.getroute());
            clonedList.add(w);
        }
        return clonedList;
    }

But I'm getting a error:

Exception in thread "main" java.lang.IndexOutOfBoundsException: Source does not fit in dest

getroute returns:

[0, 9, 11, 1, 15, 3, 0]

Solution

Collections.copy requires that the size of the destination list is at least the size of the source list. Your this.route has a size of 0 when you try to do the copy so you get an exception.

Instead use addAll:

Truck(ArrayList<Integer> route) {
   this.route.addAll(route);
}

Answered By - greg-449
Answer Checked By - Terry (JavaFixing Volunteer)