philipschwarz

public String statement()
{
    double totalAmount = 0;
    int frequentRenterPoints = 0;
    Enumeration<Rental> allRentals = rentals.elements();
    String result = "Rental record for " + getName() + "\n";
    while (allRentals.hasMoreElements())
    {
        Rental each = (Rental) allRentals.nextElement();
        frequentRenterPoints += each.getFrequentRenterPoints();

philipschwarz

public String statement()
{
    int frequentRenterPoints = 0;
    Enumeration<Rental> allRentals = rentals.elements();
    String result = "Rental record for " + getName() + "\n";
    while (allRentals.hasMoreElements())
    {
        Rental each = (Rental) allRentals.nextElement();
        frequentRenterPoints += each.getFrequentRenterPoints();
        

philipschwarz

public String statement()
{
    Enumeration<Rental> allRentals = rentals.elements();
    String result = "Rental record for " + getName() + "\n";
    while (allRentals.hasMoreElements())
    {
        Rental each = (Rental) allRentals.nextElement();
        
        // show figures for this rental
        result += "\t" + each.getMovie().getTitle() + "\t" + String.valueOf(each.getCharge()) + "\n";

philipschwarz

package bowling

class Frame 
{
    public Frame(){}
    public Frame(Frame nextFrame)
    {
        this.nextFrame = nextFrame
    }
    

philipschwarz

int calculateAveragePreviousPercentageComplete() { return reduceAndAverageActivitiesBy(PREVIOUS_PERCENTAGE_COMPLETE); }
int calculateAverageCurrentPercentageComplete() { return reduceAndAverageActivitiesBy(CURRENT_PERCENTAGE_COMPLETE); }
int calculateAverageProgressPercentage() { return reduceAndAverageActivitiesBy(PROGRESS_PERCENTAGE); }	

int reduceAndAverageActivitiesBy( Functor2<Integer, StudentActivityByAlbum, Integer> functor){
    return fold(0, activities, functor) / activities.size(); }

static final Functor2<Integer, StudentActivityByAlbum, Integer> PREVIOUS_PERCENTAGE_COMPLETE = 
    new Functor2<Integer, StudentActivityByAlbum, Integer>(){
        @Override public Integer execute(Integer accumulator, StudentActivityByAlbum value) { 

philipschwarz

int calculateAveragePreviousPercentageComplete() { return sumAndAverageTheValueOfField(PREVIOUS_PERCENTAGE_COMPLETE); }
int calculateAverageCurrentPercentageComplete() { return sumAndAverageTheValueOfField(CURRENT_PERCENTAGE_COMPLETE); }
int calculateAverageProgressPercentage() { return sumAndAverageTheValueOfField(PROGRESS_PERCENTAGE); }	

int sumAndAverageTheValueOfField( Functor<StudentActivityByAlbum, Integer> fieldGetter){
    return addAll(collect( activities, fieldGetter)) / activities.size(); }

<T> int addAll(Iterable<Integer> items){ return reduce( items, PLUS); }

static final Functor<StudentActivityByAlbum, Integer> PREVIOUS_PERCENTAGE_COMPLETE = new Functor<StudentActivityByAlbum, Integer>(){

philipschwarz

package bowling

class Frame 
{
  public add(roll) { rolls << roll }
  public addBonus(roll) { rolls << roll }

  public score(){ rolls.sum() }
  
  private rolls = []

philipschwarz

package bowling

class Frame 
{
  public add(roll) { rolls << roll }
  public addBonus(roll) { bonusRolls << roll }

  public score()
  {
    if(isStrike() || isSpare())

philipschwarz

public class BusinessObject {
  public void actionMethod() {
    // Other things
    Service myServiceObject = Service.getInstance();
    myServiceObject.doService();
    // Other things
  }
}

class Service {

philipschwarz

public class BusinessObject {
  public void actionMethod() {
    // Other things

    //No Change!
    Servicec myServiceObject = Service.getInstance();
    myServiceObject.doService();
    // Other things
  }
}