Class Trash

patterns/trash/Trash.java:8–22

package patterns.trash;

public abstract class Trash {
  public final double weight;
  public Trash(double weight) {
    this.weight = weight;
  }
  public abstract double price();
  @Override public String toString() {
    return String.format(
      "%s weight: %.2f * price: %.2f = %.2f",
      getClass().getSimpleName(),
      weight, price(), weight * price());
  }
  // Ignore for now; to be used later:
  public abstract void accept(Visitor v);
}