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Array list demo (#679)

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* Create ArrayList demo

* Update code samples according to the article

* Use toCollection(ArrayList::new) instead of toList()
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zinch84 2016-09-10 16:50:35 +03:00 committed by Grzegorz Piwowarek
parent 7ba9a1288b
commit 314c211fa2
1 changed files with 5 additions and 6 deletions
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11
core-java/src/test/java/org/baeldung/java/collections/ArrayListTest.java
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@ -7,8 +7,7 @@ import org.junit.Test;
import java.util.*; import java.util.*;
import java.util.stream.*; import java.util.stream.*;
import static java.util.stream.Collectors.toList; import static java.util.stream.Collectors.*;
import static java.util.stream.Collectors.toSet;
import static org.hamcrest.CoreMatchers.equalTo; import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.core.IsNot.not; import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.*; import static org.junit.Assert.*;
@ -22,7 +21,7 @@ public class ArrayListTest {
List<String> xs = LongStream.range(0, 16) List<String> xs = LongStream.range(0, 16)
.boxed() .boxed()
.map(Long::toHexString) .map(Long::toHexString)
.collect(toList()); .collect(toCollection(ArrayList::new));
stringsToSearch = new ArrayList<>(xs); stringsToSearch = new ArrayList<>(xs);
stringsToSearch.addAll(xs); stringsToSearch.addAll(xs);
} }
@ -92,7 +91,7 @@ public class ArrayListTest {
List<String> result = stringsToSearch List<String> result = stringsToSearch
.stream() .stream()
.filter(matchingStrings::contains) .filter(matchingStrings::contains)
.collect(toList()); .collect(toCollection(ArrayList::new));
assertEquals(6, result.size()); assertEquals(6, result.size());
} }
@ -107,7 +106,7 @@ public class ArrayListTest {
@Test @Test
public void givenIndex_whenRemove_thenCorrectElementRemoved() { public void givenIndex_whenRemove_thenCorrectElementRemoved() {
List<Integer> xs = IntStream.range(0, 10).boxed().collect(toList()); List<Integer> xs = IntStream.range(0, 10).boxed().collect(toCollection(ArrayList::new));
Collections.reverse(xs); Collections.reverse(xs);
xs.remove(0); xs.remove(0);
@ -119,7 +118,7 @@ public class ArrayListTest {
@Test @Test
public void givenListIterator_whenReverseTraversal_thenRetrieveElementsInOppositeOrder() { public void givenListIterator_whenReverseTraversal_thenRetrieveElementsInOppositeOrder() {
List<Integer> xs = IntStream.range(0, 10).boxed().collect(toList()); List<Integer> xs = IntStream.range(0, 10).boxed().collect(toCollection(ArrayList::new));
ListIterator<Integer> it = xs.listIterator(xs.size()); ListIterator<Integer> it = xs.listIterator(xs.size());
List<Integer> result = new ArrayList<>(xs.size()); List<Integer> result = new ArrayList<>(xs.size());
while (it.hasPrevious()) { while (it.hasPrevious()) {