java-design-patterns/step-builder/src/main/java/com/iluwatar/stepbuilder/App.java

package com.iluwatar.stepbuilder;

/**
 * Step Builder Pattern
 *
 * <p>
 * <b>Intent</b> <br/>
 * An extension of the Builder pattern that fully guides the user through the creation of the object
 * with no chances of confusion. <br/>
 * The user experience will be much more improved by the fact that he will only see the next step
 * methods available, NO build method until is the right time to build the object.
 *
 * <p>
 * <b>Implementation</b> </br>
 * <ul>
 * The concept is simple:
 *
 * <li>Write creational steps inner classes or interfaces where each method knows what can be
 * displayed next.</li>
 *
 * <li>Implement all your steps interfaces in an inner static class.</li>
 *
 * <li>Last step is the BuildStep, in charge of creating the object you need to build.</li>
 * </ul>
 *
 * <p>
 * <b>Applicability</b> <br/>
 * Use the Step Builder pattern when the algorithm for creating a complex object should be
 * independent of the parts that make up the object and how they're assembled the construction
 * process must allow different representations for the object that's constructed when in the
 * process of constructing the order is important.
 * <p>
 * http://rdafbn.blogspot.co.uk/2012/07/step-builder-pattern_28.html
 */
public class App {

  /**
   * Program entry point
   * 
   * @param args command line args
   */
  public static void main(String[] args) {

    Character warrior =
        CharacterStepBuilder.newBuilder().name("Amberjill").fighterClass("Paladin")
            .withWeapon("Sword").noAbilities().build();

    System.out.println(warrior);

    Character mage =
        CharacterStepBuilder.newBuilder().name("Riobard").wizardClass("Sorcerer")
            .withSpell("Fireball").withAbility("Fire Aura").withAbility("Teleport")
            .noMoreAbilities().build();

    System.out.println(mage);

    Character thief =
        CharacterStepBuilder.newBuilder().name("Desmond").fighterClass("Rogue").noWeapon().build();

    System.out.println(thief);
  }
}