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Bael 2018 (#4774)

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* BAEL-2018

* Update Animal.java

* rename

* tests added

* generic type shorten
This commit is contained in:
myluckagain 2018-07-21 21:23:02 +05:00 committed by Predrag Maric
parent b501487e0f
commit 8f52c3f6d3
3 changed files with 76 additions and 24 deletions
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20
core-java-8/src/main/java/com/baeldung/convertlisttomap/ConvertListToMapService.java
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@ -5,14 +5,15 @@ import java.util.List;
import java.util.Map; import java.util.Map;
import java.util.stream.Collectors; import java.util.stream.Collectors;
import org.apache.commons.collections4.IterableUtils;
import org.apache.commons.collections4.MapUtils; import org.apache.commons.collections4.MapUtils;
import com.google.common.collect.Maps; import com.google.common.collect.Maps;
public class ConvertListToMapService { public class ConvertListToMapService {
public Map<Integer, Animal> convertListBeforeJava8(List<Animal> list) { public Map<Integer, Animal> convertListBeforeJava8(List<Animal> list) {
Map<Integer, Animal> map = new HashMap<Integer, Animal>();
Map<Integer, Animal> map = new HashMap<>();
for (Animal animal : list) { for (Animal animal : list) {
map.put(animal.getId(), animal); map.put(animal.getId(), animal);
} }
@ -30,20 +31,9 @@ public class ConvertListToMapService {
return map; return map;
} }
public Map<Integer, Animal> convertListWithApacheCommons1(List<Animal> list) { public Map<Integer, Animal> convertListWithApacheCommons(List<Animal> list) {
Map<Integer, Animal> map = new HashMap<Integer, Animal>(); Map<Integer, Animal> map = new HashMap<>();
IterableUtils.forEach(list, animal -> {
map.put(animal.getId(), animal);
});
return map;
}
public Map<Integer, Animal> convertListWithApacheCommons2(List<Animal> list) {
Map<Integer, Animal> map = new HashMap<Integer, Animal>();
MapUtils.populateMap(map, list, Animal::getId); MapUtils.populateMap(map, list, Animal::getId);

12
core-java-8/src/test/java/com/baeldung/convertlisttomap/ConvertListToMapServiceUnitTest.java
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@ -29,6 +29,7 @@ public class ConvertListToMapServiceUnitTest {
list.add(cow); list.add(cow);
Animal goat = new Animal(5, "Goat"); Animal goat = new Animal(5, "Goat");
list.add(goat); list.add(goat);
} }
@Test @Test
@ -56,18 +57,11 @@ public class ConvertListToMapServiceUnitTest {
} }
@Test @Test
public void givenAList_whenConvertWithApacheCommons1_thenReturnMapWithTheSameElements() { public void givenAList_whenConvertWithApacheCommons_thenReturnMapWithTheSameElements() {
Map<Integer, Animal> map = convertListService.convertListWithApacheCommons1(list); Map<Integer, Animal> map = convertListService.convertListWithApacheCommons(list);
assertThat(map.values(), containsInAnyOrder(list.toArray())); assertThat(map.values(), containsInAnyOrder(list.toArray()));
} }
@Test
public void givenAList_whenConvertWithApacheCommons2_thenReturnMapWithTheSameElements() {
Map<Integer, Animal> map = convertListService.convertListWithApacheCommons2(list);
assertThat(map.values(), containsInAnyOrder(list.toArray()));
}
} }

68
core-java-8/src/test/java/com/baeldung/convertlisttomap/ConvertListWithDiplicatedIdToMapServiceUnitTest.java Normal file
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@ -0,0 +1,68 @@
package com.baeldung.convertlisttomap;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasItem;
import static org.hamcrest.Matchers.hasSize;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.junit.Before;
import org.junit.Test;
public class ConvertListWithDiplicatedIdToMapServiceUnitTest {
List<Animal> duplicatedIdList;
private ConvertListToMapService convertListService = new ConvertListToMapService();
@Before
public void init() {
this.duplicatedIdList = new ArrayList<>();
Animal cat = new Animal(1, "Cat");
duplicatedIdList.add(cat);
Animal dog = new Animal(2, "Dog");
duplicatedIdList.add(dog);
Animal pig = new Animal(3, "Pig");
duplicatedIdList.add(pig);
Animal cow = new Animal(4, "Cow");
duplicatedIdList.add(cow);
Animal goat = new Animal(4, "Goat");
duplicatedIdList.add(goat);
}
@Test
public void givenADupIdList_whenConvertBeforeJava8_thenReturnMapWithRewrittenElement() {
Map<Integer, Animal> map = convertListService.convertListBeforeJava8(duplicatedIdList);
assertThat(map.values(), hasSize(4));
assertThat(map.values(), hasItem(duplicatedIdList.get(4)));
}
@Test
public void givenADupIdList_whenConvertWithApacheCommons_thenReturnMapWithRewrittenElement() {
Map<Integer, Animal> map = convertListService.convertListWithApacheCommons(duplicatedIdList);
assertThat(map.values(), hasSize(4));
assertThat(map.values(), hasItem(duplicatedIdList.get(4)));
}
@Test(expected = IllegalStateException.class)
public void givenADupIdList_whenConvertAfterJava8_thenException() {
convertListService.convertListAfterJava8(duplicatedIdList);
}
@Test(expected = IllegalArgumentException.class)
public void givenADupIdList_whenConvertWithGuava_thenException() {
convertListService.convertListWithGuava(duplicatedIdList);
}
}