diff --git a/abstract-factory/src/main/java/com/iluwatar/abstractfactory/ElfKingdomFactory.java b/abstract-factory/src/main/java/com/iluwatar/abstractfactory/ElfKingdomFactory.java
index 31cfddb70..fc71ded76 100644
--- a/abstract-factory/src/main/java/com/iluwatar/abstractfactory/ElfKingdomFactory.java
+++ b/abstract-factory/src/main/java/com/iluwatar/abstractfactory/ElfKingdomFactory.java
@@ -29,14 +29,17 @@ package com.iluwatar.abstractfactory;
  */
 public class ElfKingdomFactory implements KingdomFactory {
 
+  @Override
   public Castle createCastle() {
     return new ElfCastle();
   }
 
+  @Override
   public King createKing() {
     return new ElfKing();
   }
 
+  @Override
   public Army createArmy() {
     return new ElfArmy();
   }
diff --git a/abstract-factory/src/main/java/com/iluwatar/abstractfactory/OrcKingdomFactory.java b/abstract-factory/src/main/java/com/iluwatar/abstractfactory/OrcKingdomFactory.java
index 5b2ba3a30..43eef13a1 100644
--- a/abstract-factory/src/main/java/com/iluwatar/abstractfactory/OrcKingdomFactory.java
+++ b/abstract-factory/src/main/java/com/iluwatar/abstractfactory/OrcKingdomFactory.java
@@ -29,14 +29,17 @@ package com.iluwatar.abstractfactory;
  */
 public class OrcKingdomFactory implements KingdomFactory {
 
+  @Override
   public Castle createCastle() {
     return new OrcCastle();
   }
 
+  @Override
   public King createKing() {
     return new OrcKing();
   }
 
+  @Override
   public Army createArmy() {
     return new OrcArmy();
   }
diff --git a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForDosVisitor.java b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForDosVisitor.java
index a6d66b1db..4ef69b4b7 100644
--- a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForDosVisitor.java
+++ b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForDosVisitor.java
@@ -33,10 +33,12 @@ public class ConfigureForDosVisitor implements AllModemVisitor {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(ConfigureForDosVisitor.class);
 
+  @Override
   public void visit(Hayes hayes) {
     LOGGER.info(hayes + " used with Dos configurator.");
   }
 
+  @Override
   public void visit(Zoom zoom) {
     LOGGER.info(zoom + " used with Dos configurator.");
   }
diff --git a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForUnixVisitor.java b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForUnixVisitor.java
index c35460121..f3be302f7 100644
--- a/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForUnixVisitor.java
+++ b/acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/ConfigureForUnixVisitor.java
@@ -34,6 +34,7 @@ public class ConfigureForUnixVisitor implements ZoomVisitor {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(ConfigureForUnixVisitor.class);
 
+  @Override
   public void visit(Zoom zoom) {
     LOGGER.info(zoom + " used with Unix configurator.");
   }
diff --git a/factory-method/src/main/java/com/iluwatar/factory/method/ElfBlacksmith.java b/factory-method/src/main/java/com/iluwatar/factory/method/ElfBlacksmith.java
index 66938bb17..63e083e35 100644
--- a/factory-method/src/main/java/com/iluwatar/factory/method/ElfBlacksmith.java
+++ b/factory-method/src/main/java/com/iluwatar/factory/method/ElfBlacksmith.java
@@ -29,6 +29,7 @@ package com.iluwatar.factory.method;
  */
 public class ElfBlacksmith implements Blacksmith {
 
+  @Override
   public Weapon manufactureWeapon(WeaponType weaponType) {
     return new ElfWeapon(weaponType);
   }
diff --git a/factory-method/src/main/java/com/iluwatar/factory/method/OrcBlacksmith.java b/factory-method/src/main/java/com/iluwatar/factory/method/OrcBlacksmith.java
index e2921a4b5..6df398a81 100644
--- a/factory-method/src/main/java/com/iluwatar/factory/method/OrcBlacksmith.java
+++ b/factory-method/src/main/java/com/iluwatar/factory/method/OrcBlacksmith.java
@@ -29,6 +29,7 @@ package com.iluwatar.factory.method;
  */
 public class OrcBlacksmith implements Blacksmith {
 
+  @Override
   public Weapon manufactureWeapon(WeaponType weaponType) {
     return new OrcWeapon(weaponType);
   }
diff --git a/throttling/src/main/java/com/iluwatar/throttling/timer/ThrottleTimerImpl.java b/throttling/src/main/java/com/iluwatar/throttling/timer/ThrottleTimerImpl.java
index 3d1e68287..e2da42350 100644
--- a/throttling/src/main/java/com/iluwatar/throttling/timer/ThrottleTimerImpl.java
+++ b/throttling/src/main/java/com/iluwatar/throttling/timer/ThrottleTimerImpl.java
@@ -49,6 +49,7 @@ public class ThrottleTimerImpl implements Throttler {
    * A timer is initiated with this method. The timer runs every second and resets the
    * counter.
    */
+  @Override
   public void start() {
     new Timer(true).schedule(new TimerTask() {
       @Override