// file:    Seed.java
// author:  Robert Keller
// purpose: a Seed is an object which can grow into something else by
//          calling a method

package Poly;

import java.io.*;
import java.lang.*;
	
class Seed
  {
  Object value;

  Seed(Growable growable)
    {
    this.value = growable;
    }

  Object grow()
    {
    while( value instanceof Growable )
      {
      value = ((Growable)value).grow();
      }
    return value;
    }
  }