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Merge pull request #10258 from dstr89/feature/BAEL-4717-hashmap-linkedlist-arraylist 

Feature/bael 4717 hashmap linkedlist arraylist
This commit is contained in:
Jonathan Cook 2020-12-13 15:02:17 +01:00 committed by GitHub
parent 53f46ad5bb 0d8d1d3a09
commit da8a8f7fa2
7 changed files with 173 additions and 0 deletions
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7
core-java-modules/core-java-collections-4/README.md Normal file
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=========
## Core Java Collections Cookbooks and Examples
### Relevant Articles:
- TODO: add article links here

31
core-java-modules/core-java-collections-4/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-4</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-4</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<assertj.version>3.18.0</assertj.version>
</properties>
</project>

30
core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ArrayListUnitTest.java Normal file
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package com.baeldung.collections.comparation;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static org.assertj.core.api.Assertions.assertThat;
public class ArrayListUnitTest {
@Test
void givenArrayList_whenItemAddedToSpecificIndex_thenItCanBeRetrieved() {
List<String> list = new ArrayList<>();
list.add("Daniel");
list.add(0, "Marko");
assertThat(list).hasSize(2);
assertThat(list.get(0)).isEqualTo("Marko");
}
@Test
void givenArrayList_whenItemRemovedViaIndex_thenListSizeIsReduced() {
List<String> list = new ArrayList<>(Arrays.asList("Daniel", "Marko"));
list.remove(1);
assertThat(list).hasSize(1);
assertThat(list).doesNotContain("Marko");
}
}

31
core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/HashMapUnitTest.java Normal file
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package com.baeldung.collections.comparation;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import static org.assertj.core.api.Assertions.assertThat;
public class HashMapUnitTest {
@Test
void givenHashMap_whenItemAddedByKey_thenItCanBeRetrieved() {
Map<String, String> map = new HashMap<>();
map.put("123456", "Daniel");
map.put("654321", "Marko");
assertThat(map.get("654321")).isEqualTo("Marko");
}
@Test
void givenHashMap_whenItemRemovedByKey_thenMapSizeIsReduced() {
Map<String, String> map = new HashMap<>();
map.put("123456", "Daniel");
map.put("654321", "Marko");
map.remove("654321");
assertThat(map).hasSize(1);
}
}

41
core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/LinkedListUnitTest.java Normal file
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package com.baeldung.collections.comparation;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import static org.assertj.core.api.Assertions.assertThat;
public class LinkedListUnitTest {
@Test
void givenLinkedList_whenItemIsAppended_thenItCanBeRetrieved() {
LinkedList<String> list = new LinkedList<>();
list.addLast("Daniel");
list.addFirst("Marko");
assertThat(list).hasSize(2);
assertThat(list.getLast()).isEqualTo("Daniel");
}
@Test
void givenLinkedList_whenItemIsRemoved_thenListSizeIsReduced() {
LinkedList<String> list = new LinkedList<>(Arrays.asList("Daniel", "Marko", "David"));
list.removeFirst();
list.removeLast();
assertThat(list).hasSize(1);
assertThat(list).containsExactly("Marko");
}
@Test
void givenLinkedList_whenItemInserted_thenItCanBeRetrievedAndDeleted() {
LinkedList<String> list = new LinkedList<>();
list.push("Daniel");
list.push("Marko");
assertThat(list.poll()).isEqualTo("Marko");
assertThat(list).hasSize(1);
}
}

32
core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ListVsMapUnitTest.java Normal file
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package com.baeldung.collections.comparation;
import static org.assertj.core.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.*;
class ListVsMapUnitTest {
@Test
void givenList_whenIteratingTroughValues_thenEachValueIsPresent() {
List<String> list = new ArrayList<>();
list.add("Daniel");
list.add("Marko");
for (String name : list) {
assertThat(name).isIn(list);
}
assertThat(list).containsExactly("Daniel", "Marko");
}
@Test
void givenMap_whenIteratingTroughValues_thenEachValueIsPresent() {
Map<Integer, String> map = new HashMap<>();
map.put(1, "Daniel");
map.put(2, "Marko");
for (String name : map.values()) {
assertThat(name).isIn(map.values());
}
assertThat(map.values()).containsExactlyInAnyOrder("Daniel", "Marko");
}
}

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core-java-modules/pom.xml
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<module>core-java-collections</module>
<module>core-java-collections-2</module>
<module>core-java-collections-3</module>
<module>core-java-collections-4</module>
<module>core-java-collections-array-list</module>
<module>core-java-collections-list</module>
<module>core-java-collections-list-2</module>