@@ -9,7 +9,7 @@
 import com.baeldung.concurrent.threadsafety.callables.ReentrantLockCounterCallable;
 import com.baeldung.concurrent.threadsafety.services.AtomicCounter;
 import com.baeldung.concurrent.threadsafety.services.Counter;
-import com.baeldung.concurrent.threadsafety.services.ExtrinsicLockCounter;
+import com.baeldung.concurrent.threadsafety.services.ObjectLockCounter;
 import com.baeldung.concurrent.threadsafety.services.MessageService;
 import com.baeldung.concurrent.threadsafety.services.ReentrantLockCounter;
 import com.baeldung.concurrent.threadsafety.services.ReentrantReadWriteLockCounter;
@@ -48,9 +48,9 @@ public static void main(String[] args) throws InterruptedException, ExecutionExc
         System.out.println(future3.get());
         System.out.println(future4.get());
 
-        ExtrinsicLockCounter extrinsicLockCounter = new ExtrinsicLockCounter();
-        Future<Integer> future5 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(extrinsicLockCounter));
-        Future<Integer> future6 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(extrinsicLockCounter));
+        ObjectLockCounter objectLockCounter = new ObjectLockCounter();
+        Future<Integer> future5 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(objectLockCounter));
+        Future<Integer> future6 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(objectLockCounter));
         System.out.println(future5.get());
         System.out.println(future6.get());
 
 
@@ -1,13 +1,13 @@
 package com.baeldung.concurrent.threadsafety.callables;
 
-import com.baeldung.concurrent.threadsafety.services.ExtrinsicLockCounter;
+import com.baeldung.concurrent.threadsafety.services.ObjectLockCounter;
 import java.util.concurrent.Callable;
 
 public class ExtrinsicLockCounterCallable implements Callable<Integer> {
 
-    private final ExtrinsicLockCounter counter;
+    private final ObjectLockCounter counter;
 
-    public ExtrinsicLockCounterCallable(ExtrinsicLockCounter counter) {
+    public ExtrinsicLockCounterCallable(ObjectLockCounter counter) {
         this.counter = counter;
     }
 
 
@@ -1,11 +1,11 @@
 package com.baeldung.concurrent.threadsafety.services;
 
-public class ExtrinsicLockCounter {
+public class ObjectLockCounter {
 
     private int counter;
     private final Object lock = new Object();
 
-    public ExtrinsicLockCounter() {
+    public ObjectLockCounter() {
         this.counter = 0;
     }
 
 
@@ -1,7 +1,7 @@
 package com.baeldung.concurrent.threadsafety;
 
 import com.baeldung.concurrent.threadsafety.callables.ExtrinsicLockCounterCallable;
-import com.baeldung.concurrent.threadsafety.services.ExtrinsicLockCounter;
+import com.baeldung.concurrent.threadsafety.services.ObjectLockCounter;
 import org.junit.Test;
 
 import java.util.concurrent.ExecutorService;
@@ -10,12 +10,12 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-public class ExtrinsicLockCounterUnitTest {
+public class ObjectLockCounterUnitTest {
 
     @Test
     public void whenCalledIncrementCounter_thenCorrect() throws Exception {
         ExecutorService executorService = Executors.newFixedThreadPool(2);
-        ExtrinsicLockCounter counter = new ExtrinsicLockCounter();
+        ObjectLockCounter counter = new ObjectLockCounter();
         Future<Integer> future1 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(counter));
         Future<Integer> future2 = (Future<Integer>) executorService.submit(new ExtrinsicLockCounterCallable(counter));