arrayListDiff

public class Main {
    private Main(){
        ArrayList<Integer> first = getArr();
        ArrayList<Integer> second = getSecondArr();
        ArrayList<Integer> diff = arrDiff(first, second);
        for(Integer one : diff){
            System.out.println(one);
        }
    }
    private ArrayList<Integer> getArr(){
        ArrayList<Integer> arr = new ArrayList<Integer>();
        arr.add(15000);
        for(int x = 0; x < 10; x++){
            arr.add(x);
        }
        return arr;
    }
    private ArrayList<Integer> getSecondArr(){
        ArrayList<Integer> second = new ArrayList<Integer>();
        for(int x = 0; x < 5; x++){
            second.add(x);
        }
        return second;
    }
    private ArrayList<Integer> arrDiff(ArrayList<Integer> first, ArrayList<Integer> second){
        ArrayList<Integer> first_copy = new ArrayList<Integer>(first);
        ArrayList<Integer> second_copy = new ArrayList<Integer>(second);
        ArrayList<Integer> diff = new ArrayList<Integer>();
        boolean is_removed = first_copy.removeAll(second_copy);
        if(is_removed){
            diff.addAll(first_copy);
            is_removed = false;
        }
        is_removed = second_copy.removeAll(first_copy);
        if(is_removed){
            diff.addAll(second_copy);
        }
        return diff;
    }
    public static void main(String[] args){
        new Main();
    }
}