diff --git a/libraries/src/test/java/com/baeldung/commons/collections/CollectionUtilsGuideTest.java b/libraries/src/test/java/com/baeldung/commons/collections/CollectionUtilsGuideTest.java
index 9166865484..90e30b01dc 100644
--- a/libraries/src/test/java/com/baeldung/commons/collections/CollectionUtilsGuideTest.java
+++ b/libraries/src/test/java/com/baeldung/commons/collections/CollectionUtilsGuideTest.java
@@ -54,8 +54,10 @@ public class CollectionUtilsGuideTest {
     
     @Test
     public void givenListOfCustomers_whenTransformed_thenListOfAddress() {
-        Collection<Address> addressCol = CollectionUtils.collect(list1, customer -> {
-            return new Address(customer.getLocality(), customer.getCity(), customer.getZip());
+        Collection<Address> addressCol = CollectionUtils.collect(list1, new Transformer<Customer, Address>() {
+            public Address transform(Customer customer) {
+                return new Address(customer.getLocality(), customer.getCity(), customer.getZip());
+            }
         });
         
         List<Address> addressList = new ArrayList<>(addressCol);
@@ -65,9 +67,13 @@ public class CollectionUtilsGuideTest {
     
     @Test
     public void givenCustomerList_whenFiltered_thenCorrectSize() {
-        
-        boolean isModified = CollectionUtils.filter(linkedList1, customer -> Arrays.asList("Daniel","Kyle").contains(customer.getName()));
-        
+
+        boolean isModified = CollectionUtils.filter(linkedList1, new Predicate<Customer>() {
+            public boolean evaluate(Customer customer) {
+                return Arrays.asList("Daniel","Kyle").contains(customer.getName());
+            }
+        });
+
         //filterInverse does the opposite. It removes the element from the list if the Predicate returns true
         //select and selectRejected work the same way except that they do not remove elements from the given collection and return a new collection