Refactor Java8CollectionCleanupUnitTest

pivovarit · pivovarit · commit c9bc20ecd3b1 · 2016-12-12T22:13:53.000+01:00
diff --git a/core-java/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java b/core-java/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java
@@ -4,6 +4,7 @@
 import org.junit.Test;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import static org.hamcrest.Matchers.hasSize;
@@ -16,31 +17,37 @@ public class Java8CollectionCleanupUnitTest {
     @Test
     public void givenListContainsNulls_whenFilteringParallel_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
-        final List<Integer> listWithoutNulls = list.parallelStream().filter(i -> i != null).collect(Collectors.toList());
+        final List<Integer> listWithoutNulls = list.parallelStream()
+          .filter(Objects::nonNull)
+          .collect(Collectors.toList());
 
         assertThat(listWithoutNulls, hasSize(3));
     }
 
     @Test
     public void givenListContainsNulls_whenFilteringSerial_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
-        final List<Integer> listWithoutNulls = list.stream().filter(i -> i != null).collect(Collectors.toList());
+        final List<Integer> listWithoutNulls = list.stream()
+          .filter(Objects::nonNull)
+          .collect(Collectors.toList());
 
         assertThat(listWithoutNulls, hasSize(3));
     }
 
     @Test
     public void givenListContainsNulls_whenRemovingNullsWithRemoveIf_thenCorrect() {
         final List<Integer> listWithoutNulls = Lists.newArrayList(null, 1, 2, null, 3, null);
-        listWithoutNulls.removeIf(p -> p == null);
+        listWithoutNulls.removeIf(Objects::isNull);
 
         assertThat(listWithoutNulls, hasSize(3));
     }
 
     @Test
     public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
         final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);
-        final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream().distinct().collect(Collectors.toList());
+        final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream()
+          .distinct()
+          .collect(Collectors.toList());
 
         assertThat(listWithoutDuplicates, hasSize(3));
     }
