import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
class Ideone {
  public static void main(String[] args) {
    List<Integer> obj = new ArrayList<>(Arrays.asList(1, 2, 3));
    Map<Integer, List<Integer>> a = new HashMap<>();
    a.put(0, obj);
    a.get(0).forEach(System.out::print);
    obj.clear();
    obj.add(4);
    obj.add(5);
    obj.add(6);
    System.out.println();
    a.get(0).forEach(System.out::print);
  }
}

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