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Refactor Java8CollectionCleanupUnitTest

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This commit is contained in:
pivovarit 2016-12-12 22:13:40 +01:00
parent c89db35aaa
commit c9bc20ecd3
1 changed files with 11 additions and 4 deletions
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15
core-java/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java
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@ -4,6 +4,7 @@ import com.google.common.collect.Lists;
import org.junit.Test; import org.junit.Test;
import java.util.List; import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors; import java.util.stream.Collectors;
import static org.hamcrest.Matchers.hasSize; import static org.hamcrest.Matchers.hasSize;
@ -16,7 +17,9 @@ public class Java8CollectionCleanupUnitTest {
@Test @Test
public void givenListContainsNulls_whenFilteringParallel_thenCorrect() { public void givenListContainsNulls_whenFilteringParallel_thenCorrect() {
final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null); 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)); assertThat(listWithoutNulls, hasSize(3));
} }
@ -24,7 +27,9 @@ public class Java8CollectionCleanupUnitTest {
@Test @Test
public void givenListContainsNulls_whenFilteringSerial_thenCorrect() { public void givenListContainsNulls_whenFilteringSerial_thenCorrect() {
final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null); 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)); assertThat(listWithoutNulls, hasSize(3));
} }
@ -32,7 +37,7 @@ public class Java8CollectionCleanupUnitTest {
@Test @Test
public void givenListContainsNulls_whenRemovingNullsWithRemoveIf_thenCorrect() { public void givenListContainsNulls_whenRemovingNullsWithRemoveIf_thenCorrect() {
final List<Integer> listWithoutNulls = Lists.newArrayList(null, 1, 2, null, 3, null); 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)); assertThat(listWithoutNulls, hasSize(3));
} }
@ -40,7 +45,9 @@ public class Java8CollectionCleanupUnitTest {
@Test @Test
public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() { public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3); 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)); assertThat(listWithoutDuplicates, hasSize(3));
} }