Fixing squid:S1118 - Utility classes should not have public constructors

caching/src/main/java/com/iluwatar/caching/AppManager.java

@@ -15,6 +15,9 @@ public class AppManager {
 
   private static CachingPolicy cachingPolicy;
 
+  private AppManager() {
+  }
+
   /**
    *
    * Developer/Tester is able to choose whether the application should use MongoDB as its underlying

caching/src/main/java/com/iluwatar/caching/CacheStore.java

@@ -11,6 +11,9 @@ public class CacheStore {
 
   static LruCache cache = null;
 
+  private CacheStore() {
+  }
+
   /**
    * Init cache capacity
    */

caching/src/main/java/com/iluwatar/caching/DbManager.java

@@ -29,6 +29,9 @@ public class DbManager {
 
   private static HashMap<String, UserAccount> virtualDB;
 
+  private DbManager() {
+  }
+
   /**
    * Create DB
    */