remove all zero 0 from array list

import java.util.*;

class Main {

  public static void main(String[] args) {

    ArrayList<Integer> cities = new ArrayList<>();

        cities.add(0);

        cities.add(0);

        cities.add(40);

        cities.add(50);

        cities.add(60);

      

      

        System.out.println("Before removing any element from ArrayList : " + cities);

        cities.removeAll(Collections.singleton(0));

      

        System.out.println("After removing one element from ArrayList : " + cities);

        cities.remove(0);

      

        // System.out.println("After removing two objects from ArrayList : " + cities);

    

  }

}