import java.util.*;

public class Composite extends Component {
  private ArrayList children = new ArrayList();

  public Composite(String name) {
    super(name);
  }

  public void add(Component c) {
    children.add(c);
  }

  public void remove(Component c) {
    children.remove(c);
  }

  public void display() {
    System.out.println(name);
    for (int i=0;i<children.size();i++) {
      Component c = (Component)children.get(i);
      c.display();
    }
  }
}