Help Code Number

[SQL Developer]

Hey i am try to add a code on eclipse but i fail on it because i can find the correct line number,can someone help me to learn about line numbers?

for example the code who i want pass tells:

The line @@ -843,4 +844,57 @@ .. what means? which line is it? 

@@ -843,4 +844,57 @@
               
        }
       
+       public L2ItemInstance[] getWeaponsList()
+       {
+               FastList<L2ItemInstance> list = FastList.newInstance();
+               for (L2ItemInstance item : _items)
+               {
+                       if ((item != null) && (item.isEnchantable()) && item.isWeapon())
+                       {
+                               int enchantLevel = Config.weaponEnchantLevel;
+                               if (Config.modifyItemEnchant)
+                               {
+                                       if (Config.modifyItemEnchantList.containsKey(item.getItemId()))
+                                       {
+                                               enchantLevel = Config.modifyItemEnchantList.get(item.getItemId());
+                                       }
+                               }
+
+                               if(item.getEnchantLevel() < enchantLevel)
+                                       list.add(item);
+                       }
+               }
+              
+               L2ItemInstance[] result = list.toArray(new L2ItemInstance[list.size()]);
+               FastList.recycle(list);
+               return result;
+       }
+      
+       public L2ItemInstance[] getArmorsList()
+       {
+               FastList<L2ItemInstance> list = FastList.newInstance();
+               for (L2ItemInstance item : _items)
+               {
+                       if ((item != null) && (item.isEnchantable()) && item.isArmor())
+                       {
+                               int enchantLevel = Config.armorEnchantLevel;
+                               if (Config.modifyItemEnchant)
+                               {
+                                       if (Config.modifyItemEnchantList.containsKey(item.getItemId()))
+                                       {
+                                               enchantLevel = Config.modifyItemEnchantList.get(item.getItemId());
+                                       }
+                               }
+
+                               if(item.getEnchantLevel() < enchantLevel)
+                               {
+                                       list.add(item);
+                               }
+                       }
+               }
+              
+               L2ItemInstance[] result = list.toArray(new L2ItemInstance[list.size()]);
+               FastList.recycle(list);
+               return result;
+       }
 }