Split or move core-java-modules/core-java-lang-oop module (#7767)

core-java-modules/core-java-lang-oop-2/README.md

@@ -8,3 +8,8 @@
 - [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
 - [Raw Types in Java](https://www.baeldung.com/raw-types-java)
 - [Java ‘private’ Access Modifier](https://www.baeldung.com/java-private-keyword)
+- [Marker Interfaces in Java](https://www.baeldung.com/java-marker-interfaces)
+- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
+- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
+- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
+- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)

core-java-modules/core-java-lang-oop-2/pom.xml

@@ -15,16 +15,26 @@
     </parent>
 
 	<dependencies>
-		<dependency>
-			<groupId>com.h2database</groupId>
-			<artifactId>h2</artifactId>
-			<version>${h2.version}</version>
-			<scope>test</scope>
-		</dependency>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>nl.jqno.equalsverifier</groupId>
+            <artifactId>equalsverifier</artifactId>
+            <version>${equalsverifier.version}</version>
+            <scope>test</scope>
+        </dependency>
 	</dependencies>
 
     <properties>
         <h2.version>1.4.199</h2.version>
+        <!-- testing -->
+        <assertj-core.version>3.10.0</assertj-core.version>
+        <equalsverifier.version>3.0.3</equalsverifier.version>
     </properties>
     
     <build>

core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/inheritancecomposition/application/Application.java

@@ -1,12 +1,6 @@
 package com.baeldung.inheritancecomposition.application;
 
-import com.baeldung.inheritancecomposition.model.Actress;
-import com.baeldung.inheritancecomposition.model.Computer;
-import com.baeldung.inheritancecomposition.model.StandardMemory;
-import com.baeldung.inheritancecomposition.model.Person;
-import com.baeldung.inheritancecomposition.model.StandardProcessor;
-import com.baeldung.inheritancecomposition.model.StandardSoundCard;
-import com.baeldung.inheritancecomposition.model.Waitress;
+import com.baeldung.inheritancecomposition.model.*;
 
 public class Application {