Create three classes for BackStageItem, AgedBrieItem and RegularItem

Java/src/main/java/com/gildedrose/AgedBrie.java

@@ -0,0 +1,32 @@
+package com.gildedrose;
+
+public class AgedBrie {
+    private Item item;
+
+    public AgedBrie(Item item) {
+        this.item=item;
+    }
+
+    public void updateQuaility() {
+        increaseQuality();
+        if (itemHasExpired()) {
+            increaseQuality();
+        }
+    }
+
+    private void increaseQuality() {
+        if (item.quality < 50) {
+            item.quality += 1;
+        }
+    }
+
+    private boolean itemHasExpired() {
+        boolean condition;
+        if (item.sellIn < 0) {
+            condition = true;
+        } else {
+            condition = false;
+        }
+        return condition;
+    }
+}

Java/src/main/java/com/gildedrose/BackStageItem.java

@@ -0,0 +1,38 @@
+package com.gildedrose;
+
+public class BackStageItem {
+    private Item item;
+
+    public BackStageItem(Item item) {
+        this.item=item;
+    }
+
+    public void update() {
+        increaseQuality();
+        if (item.sellIn < 10) {
+            increaseQuality();
+        }
+        if (item.sellIn < 5) {
+            increaseQuality();
+        }
+        if (itemHasExpired()) {
+            item.quality -= item.quality;
+        }
+    }
+
+    private void increaseQuality() {
+        if (item.quality < 50) {
+            item.quality += 1;
+        }
+    }
+
+    private boolean itemHasExpired() {
+        boolean condition;
+        if (item.sellIn < 0) {
+            condition = true;
+        } else {
+            condition = false;
+        }
+        return condition;
+    }
+}

Java/src/main/java/com/gildedrose/GildedRose.java

@@ -1,85 +0,0 @@
-package com.gildedrose;
-
-class GildedRose {
-    Item[] items;
-    String SULFURA = "Sulfuras, Hand of Ragnaros";
-    String AGED_BRIE = "Aged Brie";
-    String BACKSTAGE = "Backstage passes to a TAFKAL80ETC concert";
-
-    public GildedRose(Item[] items) {
-        this.items = items;
-    }
-
-    private void increaseQuality(Item item) {
-        if (item.quality < 50) {
-            item.quality += 1;
-        }
-    }
-
-    private void decreaseQuality(Item item) {
-        if (item.quality > 0) {
-            item.quality -= 1;
-        }
-    }
-
-    private void updateNumberOfdayToSellRemaining(Item item) {
-        item.sellIn -= 1;
-    }
-
-    private boolean itemHasExpired(Item item) {
-        boolean condition;
-        if (item.sellIn < 0) {
-            condition = true;
-        } else {
-            condition = false;
-        }
-        return condition;
-    }
-
-    private void decreaseQualityTwice(Item item) {
-        decreaseQuality(item);
-        decreaseQuality(item);
-    }
-
-    private void updateAgedBrieQuaility(Item item) {
-        increaseQuality(item);
-        if (itemHasExpired(item)) {
-            increaseQuality(item);
-        }
-    }
-
-    private void updateBackstageQuaility(Item item) {
-        increaseQuality(item);
-        if (item.sellIn < 10) {
-            increaseQuality(item);
-        }
-        if (item.sellIn < 5) {
-            increaseQuality(item);
-        }
-        if (itemHasExpired(item)) {
-            item.quality -= item.quality;
-        }
-    }
-
-    private void updateQualityItem(Item item) {
-        if (item.name.equals(AGED_BRIE)) {
-            updateAgedBrieQuaility(item);
-        } else if (item.name.equals(BACKSTAGE)) {
-            updateBackstageQuaility(item);
-        } else {
-            if (itemHasExpired(item)) {
-                decreaseQualityTwice(item);
-            } else {
-                decreaseQuality(item);
-            }
-        }
-    }
-
-    public void updateQuality() {
-        for (Item item : items) {
-            if (item.name.equals(SULFURA)) {continue;}
-            updateNumberOfdayToSellRemaining(item);
-            updateQualityItem(item);
-        }
-    }
-}

Java/src/main/java/com/gildedrose/GildedRoseItem.java

@@ -0,0 +1,38 @@
+package com.gildedrose;
+
+class GildedRoseItem {
+    Item[] items;
+    public static final String SULFURA = "Sulfuras, Hand of Ragnaros";
+    public static final String AGED_BRIE = "Aged Brie";
+    public static final String BACKSTAGE = "Backstage passes to a TAFKAL80ETC concert";
+
+
+    public GildedRoseItem(Item[] items) {
+        this.items = items;
+    }
+
+    private void updateNumberOfdayToSellRemaining(Item item) {
+        item.sellIn -= 1;
+    }
+
+    private void updateQualityItem(Item item) {
+        if (item.name.equals(AGED_BRIE)) {
+            AgedBrie agedBrieItem = new AgedBrie(item);
+            agedBrieItem.updateQuaility();
+        } else if (item.name.equals(BACKSTAGE)) {
+            BackStageItem backStageItem = new BackStageItem(item);
+            backStageItem.update();
+        } else {
+           RegularItem regularItem = new RegularItem(item);
+           regularItem.updateQuality();
+        }
+    }
+
+    public void updateQuality() {
+        for (Item item : items) {
+            if (item.name.equals(SULFURA)) {continue;}
+            updateNumberOfdayToSellRemaining(item);
+            updateQualityItem(item);
+        }
+    }
+}

Java/src/main/java/com/gildedrose/RegularItem.java

@@ -0,0 +1,40 @@
+package com.gildedrose;
+
+public class RegularItem {
+    private Item item;
+
+    public RegularItem(Item item) {
+        this.item = item;
+    }
+
+    public void updateQuality() {
+        if (itemHasExpired(item)) {
+            decreaseQualityTwice();
+        } else {
+            decreaseQuality();
+        }
+    }
+
+    private boolean itemHasExpired(Item item) {
+        boolean condition;
+        if (item.sellIn < 0) {
+            condition = true;
+        } else {
+            condition = false;
+        }
+        return condition;
+    }
+
+
+    private void decreaseQualityTwice() {
+        decreaseQuality();
+        decreaseQuality();
+    }
+
+    private void decreaseQuality() {
+        if (item.quality > 0) {
+            item.quality -= 1;
+        }
+    }
+
+}

Java/src/test/java/com/gildedrose/GildedRoseItemTest.java

@@ -5,7 +5,7 @@ import java.util.HashMap;
 
 import org.junit.Test;
 
-public class GildedRoseTest {
+public class GildedRoseItemTest {
     private Item[] itemsSample = new Item[]{new Item("+5 Dexterity Vest", 10, 20), //
             new Item("Aged Brie", 2, 0), //
             new Item("Elixir of the Mongoose", 5, 7), //
@@ -14,7 +14,7 @@ public class GildedRoseTest {
             // this conjured item does not work properly yet
             new Item("Conjured Mana Cake", 3, 6) };
 
-    private GildedRose app = new GildedRose(itemsSample);
+    private GildedRoseItem app = new GildedRoseItem(itemsSample);
 
     /**
      * Test if item.sellIn and item.quality is the same that expected after a number of day.

Java/src/test/java/com/gildedrose/TexttestFixture.java

@@ -16,7 +16,7 @@ public class TexttestFixture {
                 // this conjured item does not work properly yet
                 new Item("Conjured Mana Cake", 3, 6) };
 
-        GildedRose app = new GildedRose(items);
+        GildedRoseItem app = new GildedRoseItem(items);
 
         int days = 2;
         if (args.length > 0) {