first hack at a version for each language, translated from the C#.

GildedRose/Java/GildedRose.java

@@ -0,0 +1,99 @@
+
+class GildedRose {
+    List<Item> items;
+
+    public static void Main(string[] args) {
+        System.out.println("OMGHAI!");
+
+        List<Item> items = new List<Item> {
+              new Item("+5 Dexterity Vest", 10, 20),
+              new Item("Aged Brie", 2, 0),
+              new Item("Elixir of the Mongoose", 5, 7),
+              new Item("Sulfuras, Hand of Ragnaros", 0, 80),
+              new Item("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+              new Item("Conjured Mana Cake", 3, 6)
+          }
+
+        GildedRose app = new GildedRose(items);
+
+        app.updateQuality();
+
+    }
+
+    public void updateQuality() {
+        for (int i = 0; i < items.length; i++)
+        {
+            if (items[i].name != "Aged Brie" && items[i].name != "Backstage passes to a TAFKAL80ETC concert")
+            {
+                if (items[i].quality > 0)
+                {
+                    if (items[i].name != "Sulfuras, Hand of Ragnaros")
+                    {
+                        items[i].quality = items[i].quality - 1;
+                    }
+                }
+            }
+            else
+            {
+                if (items[i].quality < 50)
+                {
+                    items[i].quality = items[i].quality + 1;
+
+                    if (items[i].name == "Backstage passes to a TAFKAL80ETC concert")
+                    {
+                        if (items[i].sellIn < 11)
+                        {
+                            if (items[i].quality < 50)
+                            {
+                                items[i].quality = items[i].quality + 1;
+                            }
+                        }
+
+                        if (items[i].sellIn < 6)
+                        {
+                            if (items[i].quality < 50)
+                            {
+                                items[i].quality = items[i].quality + 1;
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (items[i].name != "Sulfuras, Hand of Ragnaros")
+            {
+                items[i].sellIn = items[i].sellIn - 1;
+            }
+
+            if (items[i].sellIn < 0)
+            {
+                if (items[i].name != "Aged Brie")
+                {
+                    if (items[i].name != "Backstage passes to a TAFKAL80ETC concert")
+                    {
+                        if (items[i].quality > 0)
+                        {
+                            if (items[i].name != "Sulfuras, Hand of Ragnaros")
+                            {
+                                items[i].quality = items[i].quality - 1;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        items[i].quality = items[i].quality - items[i].quality;
+                    }
+                }
+                else
+                {
+                    if (items[i].quality < 50)
+                    {
+                        items[i].quality = items[i].quality + 1;
+                    }
+                }
+            }
+        }
+    }
+
+}
+

GildedRose/Java/Item.java

@@ -0,0 +1,14 @@
+public class Item {
+
+    public String name;
+
+    public int sellIn;
+
+    public int quality;
+    
+    public Item(String name, int sellIn, int quality) {
+        this.name = name;
+        this.sellIn = sellIn;
+        this.quality = quality;
+    }
+}