#111 Implementation of Step Builder pattern

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

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+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.
+ *
+ * http://rdafbn.blogspot.co.uk/2012/07/step-builder-pattern_28.html
+ */
+public class App {
+        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);
+        }
+}