public class Gota
{
  private double tamanno = 0.0;

  public Gota(double tamannoInicial)
  {
    this.tamanno = tamannoInicial;
  }
  
  public Gota unir(Gota otra)
  {
    Gota resultante = new Gota(this.tamanno + otra.tamanno);
    this.tamanno = otra.tamanno = 0;
    return resultante;
  }
}