View difference between Paste ID: eGrhgbeY and B596Zdc2

 public class AllergyRegister {
 
     private static AllergyRegister instance;
     private Map<Integer, Allergy> allergies;
 
     public static AllergyRegister getInstance(){
         if(instance == null)
             instance = new AllergyRegister();
         return instance;
     }
 
     private AllergyRegister(){
-    //constructor private houden
+
     }
 
     public void Register(Allergy allergy){
         this.allergies.put(allergy.getId(), allergy);
     }
 
     public Allergy getByProductAllergyID(int prodAllergyID){
         for(Allergy allergy : allergies)
-    public Allergy getById(int id){
+            if(allergy.getProductAllergyID() == prodAllergyID)
-        return this.allergies.containsKey(id) ? this.allergies.get(id) : null;
+                return allergy;
         return null;
-
+
 
     public Map<Integer, Allergy> getAllAllergies(){
         return  this.allergies;
     }
 
 }