abstract class implements methods which are not overridden

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

@@ -1,10 +1,10 @@
 package com.gildedrose.item;
 
-public class AgedBrie extends CustomisedItem {
+class AgedBrie extends CustomisedItem {
 
     private final Item item;
 
-    public AgedBrie(Item item) {
+    AgedBrie(Item item) {
         this.item = item;
     }
 
@@ -17,14 +17,4 @@ public class AgedBrie extends CustomisedItem {
     int updatedItemQuality() {
         return item.quality += 1;
     }
-
-    @Override
-    protected boolean hasReachedHighestQualityValue() {
-        return item.quality > QualityValues.highestValuePossible(item);
-    }
-
-    @Override
-    protected boolean hasReachedLowestQualityValue() {
-        return item.quality < QualityValues.lowestValuePossible();
-    }
 }

Java/src/main/java/com/gildedrose/item/BackstagePassesItem.java

@@ -1,10 +1,10 @@
 package com.gildedrose.item;
 
-public class BackstagePassesItem extends CustomisedItem {
+class BackstagePassesItem extends CustomisedItem {
 
     private final Item item;
 
-    public BackstagePassesItem(Item item) {
+    BackstagePassesItem(Item item) {
         this.item = item;
     }
 
@@ -26,16 +26,6 @@ public class BackstagePassesItem extends CustomisedItem {
         }
     }
 
-    @Override
-    protected boolean hasReachedHighestQualityValue() {
-        return item.quality > QualityValues.highestValuePossible(item);
-    }
-
-    @Override
-    protected boolean hasReachedLowestQualityValue() {
-        return item.quality < QualityValues.lowestValuePossible();
-    }
-
     private boolean sellByDayValueIsOver(int dayNumber) {
         return item.sellIn > dayNumber;
     }

Java/src/main/java/com/gildedrose/item/ConjuredItem.java

@@ -1,23 +1,13 @@
 package com.gildedrose.item;
 
-public class ConjuredItem extends CustomisedItem {
+class ConjuredItem extends CustomisedItem {
 
     private final Item item;
 
-    public ConjuredItem(Item item) {
+    ConjuredItem(Item item) {
         this.item = item;
     }
 
-    @Override
-    protected boolean hasReachedHighestQualityValue() {
-        return item.quality > QualityValues.highestValuePossible(item);
-    }
-
-    @Override
-    protected boolean hasReachedLowestQualityValue() {
-        return item.quality < QualityValues.lowestValuePossible();
-    }
-
     @Override
     int updatedItemSellIn() {
         return item.sellIn -= 1;

Java/src/main/java/com/gildedrose/item/CustomisedItem.java

@@ -6,9 +6,9 @@ public abstract class CustomisedItem {
         item.sellIn = updatedItemSellIn();
         item.quality = updatedItemQuality();
 
-        if (hasReachedLowestQualityValue()) {
+        if (hasReachedLowestQualityValue(item)) {
             item.quality = QualityValues.lowestValuePossible();
-        } else if (hasReachedHighestQualityValue()) {
+        } else if (hasReachedHighestQualityValue(item)) {
             item.quality = QualityValues.highestValuePossible(item);
         }
     }
@@ -17,7 +17,11 @@ public abstract class CustomisedItem {
 
     abstract int updatedItemQuality();
 
-    protected abstract boolean hasReachedHighestQualityValue();
+    private boolean hasReachedHighestQualityValue(Item item) {
-
+        return item.quality > QualityValues.highestValuePossible(item);
-    protected abstract boolean hasReachedLowestQualityValue();
+    }
+
+    private boolean hasReachedLowestQualityValue(Item item) {
+        return item.quality < QualityValues.lowestValuePossible();
+    }
 }

Java/src/main/java/com/gildedrose/item/QualityValues.java

@@ -1,12 +1,12 @@
 package com.gildedrose.item;
 
-public final class QualityValues {
+final class QualityValues {
 
-    public static int lowestValuePossible() {
+    static int lowestValuePossible() {
         return 0;
     }
 
-    public static int highestValuePossible(Item item) {
+    static int highestValuePossible(Item item) {
         if (item.name.equals(CustomisedItemFactory.SULFURAS)) {
             return 80;
         }

Java/src/main/java/com/gildedrose/item/StandardItem.java

@@ -1,10 +1,10 @@
 package com.gildedrose.item;
 
-public class StandardItem extends CustomisedItem {
+class StandardItem extends CustomisedItem {
 
     private final Item item;
 
-    public StandardItem(Item item) {
+    StandardItem(Item item) {
         this.item = item;
     }
 
@@ -22,16 +22,6 @@ public class StandardItem extends CustomisedItem {
         }
     }
 
-    @Override
-    protected boolean hasReachedHighestQualityValue() {
-        return item.quality > QualityValues.highestValuePossible(item);
-    }
-
-    @Override
-    protected boolean hasReachedLowestQualityValue() {
-        return item.quality < QualityValues.lowestValuePossible();
-    }
-
     private boolean sellByDayValueIsOverZero() {
         return item.sellIn > 0;
     }

Java/src/main/java/com/gildedrose/item/Sulfuras.java

@@ -1,10 +1,10 @@
 package com.gildedrose.item;
 
-public class Sulfuras extends CustomisedItem {
+class Sulfuras extends CustomisedItem {
 
     private final Item item;
 
-    public Sulfuras(Item item) {
+    Sulfuras(Item item) {
         this.item = item;
     }
 
@@ -17,14 +17,4 @@ public class Sulfuras extends CustomisedItem {
     int updatedItemQuality() {
         return item.quality;
     }
-
-    @Override
-    protected boolean hasReachedHighestQualityValue() {
-        return item.quality > QualityValues.highestValuePossible(item) ;
-    }
-
-    @Override
-    protected boolean hasReachedLowestQualityValue() {
-        return item.quality < QualityValues.lowestValuePossible();
-    }
 }