diff --git a/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/SingleLock.java b/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/SingleLock.java
index 19b3ba4510..4dff459df6 100644
--- a/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/SingleLock.java
+++ b/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/SingleLock.java
@@ -14,8 +14,8 @@ public class SingleLock extends ConcurrentAccessExperiment {
 
     protected Supplier<?> putSupplier(Map<String,String> map, int key) {
         return (()-> {
+            lock.lock();
             try {
-                lock.lock();
                 return map.put("key" + key, "value" + key);
             } finally {
                 lock.unlock();
@@ -25,8 +25,8 @@ public class SingleLock extends ConcurrentAccessExperiment {
 
     protected Supplier<?> getSupplier(Map<String,String> map, int key) {
         return (()-> {
+            lock.lock();
             try {
-                lock.lock();
                 return map.get("key" + key);
             } finally {
                 lock.unlock();
diff --git a/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/StripedLock.java b/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/StripedLock.java
index 7adca428ba..47c47d8813 100644
--- a/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/StripedLock.java
+++ b/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/StripedLock.java
@@ -17,8 +17,8 @@ public class StripedLock extends ConcurrentAccessExperiment {
         return (()-> {
             int bucket = key % stripedLock.size();
             Lock lock = stripedLock.get(bucket);
+            lock.lock();
             try {
-                lock.lock();
                 return map.put("key" + key, "value" + key);
             } finally {
                 lock.unlock();
@@ -30,8 +30,8 @@ public class StripedLock extends ConcurrentAccessExperiment {
         return (()-> {
             int bucket = key % stripedLock.size();
             Lock lock = stripedLock.get(bucket);
+            lock.lock();
             try {
-                lock.lock();
                 return map.get("key" + key);
             } finally {
                 lock.unlock();