diff --git a/core-java-modules/core-java-collections-4/README.md b/core-java-modules/core-java-collections-4/README.md
new file mode 100644
index 0000000000..1c680b86ba
--- /dev/null
+++ b/core-java-modules/core-java-collections-4/README.md
@@ -0,0 +1,7 @@
+=========
+
+## Core Java Collections Cookbooks and Examples
+
+### Relevant Articles: 
+
+- TODO: add article links here
diff --git a/core-java-modules/core-java-collections-4/pom.xml b/core-java-modules/core-java-collections-4/pom.xml
new file mode 100644
index 0000000000..0e3cabf40e
--- /dev/null
+++ b/core-java-modules/core-java-collections-4/pom.xml
@@ -0,0 +1,31 @@
+<?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>
diff --git a/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ArrayListUnitTest.java b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ArrayListUnitTest.java
new file mode 100644
index 0000000000..bc6a07d274
--- /dev/null
+++ b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ArrayListUnitTest.java
@@ -0,0 +1,30 @@
+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");
+    }
+
+}
diff --git a/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/HashMapUnitTest.java b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/HashMapUnitTest.java
new file mode 100644
index 0000000000..3b595472e0
--- /dev/null
+++ b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/HashMapUnitTest.java
@@ -0,0 +1,31 @@
+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);
+    }
+
+}
diff --git a/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/LinkedListUnitTest.java b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/LinkedListUnitTest.java
new file mode 100644
index 0000000000..aa6b7fa923
--- /dev/null
+++ b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/LinkedListUnitTest.java
@@ -0,0 +1,41 @@
+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);
+    }
+
+}
diff --git a/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ListVsMapUnitTest.java b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ListVsMapUnitTest.java
new file mode 100644
index 0000000000..dd6bf760fd
--- /dev/null
+++ b/core-java-modules/core-java-collections-4/src/test/java/com/baeldung/collections/comparation/ListVsMapUnitTest.java
@@ -0,0 +1,32 @@
+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");
+    }
+
+}
diff --git a/core-java-modules/pom.xml b/core-java-modules/pom.xml
index 2f3965b237..0a9e818156 100644
--- a/core-java-modules/pom.xml
+++ b/core-java-modules/pom.xml
@@ -34,6 +34,7 @@
         <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>