diff --git a/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java b/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
index 28604108f6..ff3fb8bc8a 100644
--- a/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
+++ b/core-java-8/src/test/java/org/baeldung/java8/Java8SortUnitTest.java
@@ -35,7 +35,7 @@ public class Java8SortUnitTest {
     public final void whenSortingEntitiesByName_thenCorrectlySorted() {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
 
-        Collections.sort(humans, (final Human h1, final Human h2) -> h1.getName().compareTo(h2.getName()));
+        humans.sort((final Human h1, final Human h2) -> h1.getName().compareTo(h2.getName()));
 
         Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
     }
@@ -52,7 +52,7 @@ public class Java8SortUnitTest {
     @Test
     public final void whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
-        Collections.sort(humans, (lhs, rhs) -> {
+        humans.sort((lhs, rhs) -> {
             if (lhs.getName().equals(rhs.getName())) {
                 return lhs.getAge() - rhs.getAge();
             } else {
@@ -67,14 +67,16 @@ public class Java8SortUnitTest {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 12), new Human("Sarah", 10), new Human("Zack", 12));
         final Comparator<Human> byName = (h1, h2) -> h1.getName().compareTo(h2.getName());
         final Comparator<Human> byAge = (h1, h2) -> Ints.compare(h1.getAge(), h2.getAge());
-        Collections.sort(humans, byName.thenComparing(byAge));
+
+        humans.sort(byName.thenComparing(byAge));
         Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
     }
 
     @Test
     public final void whenSortingEntitiesByAge_thenCorrectlySorted() {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
-        Collections.sort(humans, (h1, h2) -> Ints.compare(h1.getAge(), h2.getAge()));
+
+        humans.sort((h1, h2) -> Ints.compare(h1.getAge(), h2.getAge()));
         Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
     }
 
@@ -82,21 +84,24 @@ public class Java8SortUnitTest {
     public final void whenSortingEntitiesByNameReversed_thenCorrectlySorted() {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
         final Comparator<Human> comparator = (h1, h2) -> h1.getName().compareTo(h2.getName());
-        Collections.sort(humans, comparator.reversed());
+
+        humans.sort(comparator.reversed());
         Assert.assertThat(humans.get(0), equalTo(new Human("Sarah", 10)));
     }
 
     @Test
     public final void givenMethodDefinition_whenSortingEntitiesByNameThenAge_thenCorrectlySorted() {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
-        Collections.sort(humans, Human::compareByNameThenAge);
+
+        humans.sort(Human::compareByNameThenAge);
         Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
     }
 
     @Test
     public final void givenInstanceMethod_whenSortingEntitiesByName_thenCorrectlySorted() {
         final List<Human> humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12));
-        Collections.sort(humans, Comparator.comparing(Human::getName));
+
+        humans.sort(Comparator.comparing(Human::getName));
         Assert.assertThat(humans.get(0), equalTo(new Human("Jack", 12)));
     }