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JonCookJonCook
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Merge pull request eugenp#10258 from dstr89/feature/BAEL-4717-hashmap-linkedlist-arraylist
Feature/bael 4717 hashmap linkedlist arraylist
2 parents cbb67ed + 0cf8f15 commit 042d01e

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‎core-java-modules/core-java-collections-4/README.md‎

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=========
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## Core Java Collections Cookbooks and Examples
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### Relevant Articles:
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- TODO: add article links here

‎core-java-modules/core-java-collections-4/pom.xml‎

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

‎core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ArrayListUnitTest.java‎

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

‎core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/HashMapUnitTest.java‎

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

‎core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/LinkedListUnitTest.java‎

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

‎core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ListVsMapUnitTest.java‎

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

‎core-java-modules/pom.xml‎

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<module>core-java-collections</module>
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<module>core-java-collections-2</module>
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<module>core-java-collections-3</module>
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<module>core-java-collections-4</module>
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<module>core-java-collections-array-list</module>
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<module>core-java-collections-list</module>
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<module>core-java-collections-list-2</module>

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