import java.util.ArrayList;
import java.util.Collections;

// comparable must be extended by T to use Collections.min
class ListNum <T extends Number & Comparable<T>>
{
  private ArrayList<T> al_;

  public ListNum() {
    al_ = new ArrayList<T>();
  }

  public boolean add(T object) {
    return al_.add(object);
  }

  public T min() {
    return Collections.min(al_);
  }
}

public class ListTest
{
  static public void main(String args[]) {
    ListNum<Double> list = new ListNum<Double>();
    list.add(3.0);
    list.add(2.0);
    list.add(4.0);

    System.out.println(list.min());
  }
}