squid:S2293 - The diamond operator should be used

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

@@ -37,7 +37,7 @@ public class DbManager {
    */
   public static void createVirtualDb() {
     useMongoDB = false;
-    virtualDB = new HashMap<String, UserAccount>();
+    virtualDB = new HashMap<>();
   }
 
   /**

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

@@ -27,7 +27,7 @@ public class LruCache {
   }
 
   int capacity;
-  HashMap<String, Node> cache = new HashMap<String, Node>();
+  HashMap<String, Node> cache = new HashMap<>();
   Node head = null;
   Node end = null;
 
@@ -140,7 +140,7 @@ public class LruCache {
    * Returns cache data in list form.
    */
   public ArrayList<UserAccount> getCacheDataInListForm() {
-    ArrayList<UserAccount> listOfCacheData = new ArrayList<UserAccount>();
+    ArrayList<UserAccount> listOfCacheData = new ArrayList<>();
     Node temp = head;
     while (temp != null) {
       listOfCacheData.add(temp.userAccount);

composite/src/main/java/com/iluwatar/composite/LetterComposite.java

@@ -10,7 +10,7 @@ import java.util.List;
  */
 public abstract class LetterComposite {
 
-  private List<LetterComposite> children = new ArrayList<LetterComposite>();
+  private List<LetterComposite> children = new ArrayList<>();
 
   public void add(LetterComposite letter) {
     children.add(letter);

composite/src/main/java/com/iluwatar/composite/Messenger.java

@@ -13,7 +13,7 @@ public class Messenger {
 
   LetterComposite messageFromOrcs() {
 
-    List<Word> words = new ArrayList<Word>();
+    List<Word> words = new ArrayList<>();
 
     words.add(new Word(Arrays.asList(new Letter('W'), new Letter('h'), new Letter('e'), new Letter(
         'r'), new Letter('e'))));
@@ -35,7 +35,7 @@ public class Messenger {
 
   LetterComposite messageFromElves() {
 
-    List<Word> words = new ArrayList<Word>();
+    List<Word> words = new ArrayList<>();
 
     words.add(new Word(Arrays.asList(new Letter('M'), new Letter('u'), new Letter('c'), new Letter(
         'h'))));

dao/src/main/java/com/iluwatar/dao/App.java

@@ -52,7 +52,7 @@ public class App {
     final Customer customer1 = new Customer(1, "Adam", "Adamson");
     final Customer customer2 = new Customer(2, "Bob", "Bobson");
     final Customer customer3 = new Customer(3, "Carl", "Carlson");
-    final List<Customer> customers = new ArrayList<Customer>();
+    final List<Customer> customers = new ArrayList<>();
     customers.add(customer1);
     customers.add(customer2);
     customers.add(customer3);

dao/src/test/java/com/iluwatar/dao/CustomerDaoImplTest.java

@@ -18,7 +18,7 @@ public class CustomerDaoImplTest {
 
   @Before
   public void setUp() {
-    customers = new ArrayList<Customer>();
+    customers = new ArrayList<>();
     customers.add(CUSTOMER);
     impl = new CustomerDaoImpl(customers);
   }

layers/src/main/java/com/iluwatar/layers/CakeBakingServiceImpl.java

@@ -141,7 +141,7 @@ public class CakeBakingServiceImpl implements CakeBakingService {
       CakeToppingInfo cakeToppingInfo =
           new CakeToppingInfo(cake.getTopping().getId(), cake.getTopping().getName(), cake
               .getTopping().getCalories());
-      ArrayList<CakeLayerInfo> cakeLayerInfos = new ArrayList<CakeLayerInfo>();
+      ArrayList<CakeLayerInfo> cakeLayerInfos = new ArrayList<>();
       for (CakeLayer layer : cake.getLayers()) {
         cakeLayerInfos.add(new CakeLayerInfo(layer.getId(), layer.getName(), layer.getCalories()));
       }

poison-pill/src/main/java/com/iluwatar/poison/pill/SimpleMessageQueue.java

@@ -11,7 +11,7 @@ public class SimpleMessageQueue implements MessageQueue {
   private final BlockingQueue<Message> queue;
 
   public SimpleMessageQueue(int bound) {
-    queue = new ArrayBlockingQueue<Message>(bound);
+    queue = new ArrayBlockingQueue<>(bound);
   }
 
   @Override

producer-consumer/src/main/java/com/iluwatar/producer/consumer/ItemQueue.java

@@ -11,7 +11,7 @@ public class ItemQueue {
 
   public ItemQueue() {
 
-    queue = new LinkedBlockingQueue<Item>(5);
+    queue = new LinkedBlockingQueue<>(5);
   }
 
   public void put(Item item) throws InterruptedException {

service-layer/src/main/java/com/iluwatar/servicelayer/magic/MagicServiceImpl.java

@@ -48,13 +48,13 @@ public class MagicServiceImpl implements MagicService {
   @Override
   public List<Wizard> findWizardsWithSpellbook(String name) {
     Spellbook spellbook = spellbookDao.findByName(name);
-    return new ArrayList<Wizard>(spellbook.getWizards());
+    return new ArrayList<>(spellbook.getWizards());
   }
 
   @Override
   public List<Wizard> findWizardsWithSpell(String name) {
     Spell spell = spellDao.findByName(name);
     Spellbook spellbook = spell.getSpellbook();
-    return new ArrayList<Wizard>(spellbook.getWizards());
+    return new ArrayList<>(spellbook.getWizards());
   }
 }

service-layer/src/main/java/com/iluwatar/servicelayer/spellbook/Spellbook.java

@@ -27,8 +27,8 @@ import com.iluwatar.servicelayer.wizard.Wizard;
 public class Spellbook extends BaseEntity {
 
   public Spellbook() {
-    spells = new HashSet<Spell>();
+    spells = new HashSet<>();
-    wizards = new HashSet<Wizard>();
+    wizards = new HashSet<>();
   }
 
   public Spellbook(String name) {

service-layer/src/main/java/com/iluwatar/servicelayer/wizard/Wizard.java

@@ -24,7 +24,7 @@ import com.iluwatar.servicelayer.spellbook.Spellbook;
 public class Wizard extends BaseEntity {
 
   public Wizard() {
-    spellbooks = new HashSet<Spellbook>();
+    spellbooks = new HashSet<>();
   }
 
   public Wizard(String name) {

service-locator/src/main/java/com/iluwatar/servicelocator/ServiceCache.java

@@ -16,7 +16,7 @@ public class ServiceCache {
   private final Map<String, Service> serviceCache;
 
   public ServiceCache() {
-    serviceCache = new HashMap<String, Service>();
+    serviceCache = new HashMap<>();
   }
 
   /**