Merge pull request #8001 from eugenp/lambda-compareto

Fixed method reference examples in labmda article

core-java-modules/core-java-lambdas/src/test/java/com/baeldung/java8/lambda/methodreference/MethodReferenceUnitTest.java

@@ -35,9 +35,9 @@ public class MethodReferenceUnitTest {
     public void referenceToInstanceMethodOfArbitratyObjectOfParticularType() {
         List<Integer> numbers = Arrays.asList(5, 3, 50, 24, 40, 2, 9, 18);
         numbers.stream()
-            .sorted((a, b) -> Integer.compare(a, b));
+            .sorted((a, b) -> a.compareTo(b));
         numbers.stream()
-            .sorted(Integer::compare);
+            .sorted(Integer::compareTo);
     }
 
     @Test