PatternMatch.java

class Movie {
  
  enum Type {
    REGULAR(PriceService::getRegularPrice),
    NEW_RELEASE(PriceService::getNewReleasePrice),
    CHILDREN(PriceService::getChildrensPrice);
    
    public final BiFunction<PriceService, Integer, Double> priceAlgo;
    
    private Type(BiFunction<PriceService, Integer, Double> priceService) {
      this.priceAlgo = priceAlgo;
    }
  }
  
  private final Type type;
  
  public Movie(Type type) {
    this.type = type;
  }
  
  public double computePrice(int days) {
    return type.computePrice(days)
  }
    
}

class PriceService {
  public double getRegularPrice(int days) {
    return days * 2;
  }
  
  public double getNewReleasePrice(int days) {
    return days * 3;
  }
  
  public double getChildrensPrice(int days) {
    return days * 1.5;
  }
  
  public double computePrice(Movie.Type type, int days) {
    return type.priceAlgo.apply(this, days);
  }
}

class Main {
  public static void main(String[] args) {
    PriceService priceService = new PriceService();
    System.out.println(priceService.computePrice(Movie.Type.REGULAR, 2));
    System.out.println(priceService.computePrice(Movie.Type.NEW_RELEASE, 2));
    System.out.println(priceService.computePrice(Movie.Type.CHILDREN, 2));
  }
}