methods created to increase/decrease quality and sell in

Inventory.java

@@ -15,15 +15,14 @@ public class Inventory {
             }else if(items[i].getName().equals("Aged Brie")){
                 increaseQualityByOne(i);
             }else{
-                if (items[i].getQuality() > 0) {
-                    if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
-                        items[i].setQuality(items[i].getQuality() - 1);
-                    }
+                if ((items[i].getQuality() > 0)&&(!items[i].getName().equals("Sulfuras, Hand of Ragnaros")))
+                {              
+                    decreaseQualityByOne(i);                   
                 }
             }
 
             if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
-                items[i].setSellIn(items[i].getSellIn() - 1);
+                decreaseSellInByOne(i);
             }
 
             if (items[i].getSellIn() < 0) {
@@ -31,12 +30,11 @@ public class Inventory {
                     if (!items[i].getName().equals("Backstage passes to a TAFKAL80ETC concert")) {
                         if (items[i].getQuality() > 0) {
                             if (!items[i].getName().equals("Sulfuras, Hand of Ragnaros")) {
-                                items[i].setQuality(items[i].getQuality() - 1);
+                                decreaseQualityByOne(i);
                             }
                         }
                     } else {
-                        items[i].setQuality(items[i].getQuality()
-                            - items[i].getQuality());
+                        items[i].setQuality(0);
                     }
                 } else {
                     increaseQualityByOne(i);
@@ -52,6 +50,14 @@ public class Inventory {
         }
     }
 
+    public void decreaseQualityByOne(int i){
+        items[i].setQuality(items[i].getQuality() - 1);
+    }
+
+    public void decreaseSellInByOne(int i){
+        items[i].setSellIn(items[i].getSellIn() - 1);
+    }
+
     public void increaseQualityForBackstagePasses(int i){
         if(items[i].getSellIn() < 11) {
             increaseQualityByOne(i);
@@ -60,4 +66,5 @@ public class Inventory {
             increaseQualityByOne(i);
         }
     }
+
 }