[JAVA-621] core-java-lang-oop-patterns module

* Creation

* Moved code from https://www.baeldung.com/java-composition-aggregation-association

* Moved code from https://www.baeldung.com/java-inheritance-composition

* Moved code from https://www.baeldung.com/java-immutable-object

* Moved code from https://www.baeldung.com/java-deep-copy

* Moved article references to the new README.md

core-java-modules/core-java-lang-oop-3/README.md

@@ -8,7 +8,6 @@ This module contains articles about Object-oriented programming (OOP) in Java
 - [Guide to the super Java Keyword](https://www.baeldung.com/java-super)
 - [Guide to the this Java Keyword](https://www.baeldung.com/java-this)
 - [Java ‘public’ Access Modifier](https://www.baeldung.com/java-public-keyword)
-- [Composition, Aggregation, and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)
 - [Nested Classes in Java](https://www.baeldung.com/java-nested-classes)
 - [A Guide to Inner Interfaces in Java](https://www.baeldung.com/java-inner-interfaces)
 - [Java Classes and Objects](https://www.baeldung.com/java-classes-objects)

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/aggregation/Car.java

@@ -1,9 +0,0 @@
-package com.baeldung.relationships.aggregation;
-
-import java.util.List;
-
-public class Car {
-
-    private List<Wheel> wheels;
-    
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/aggregation/CarWithStaticInnerWheel.java

@@ -1,13 +0,0 @@
-package com.baeldung.relationships.aggregation;
-
-import java.util.List;
-
-public class CarWithStaticInnerWheel {
-
-    private List<Wheel> wheels;
-
-    public static class Wheel {
-
-    }
-
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/aggregation/Wheel.java

@@ -1,7 +0,0 @@
-package com.baeldung.relationships.aggregation;
-
-public class Wheel {
-
-    private Car car;
-    
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/association/Child.java

@@ -1,7 +0,0 @@
-package com.baeldung.relationships.association;
-
-public class Child {
-
-    private Mother mother;
-
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/association/Mother.java

@@ -1,9 +0,0 @@
-package com.baeldung.relationships.association;
-
-import java.util.List;
-
-public class Mother {
-
-    private List<Child> children;
-
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/composition/Building.java

@@ -1,18 +0,0 @@
-package com.baeldung.relationships.composition;
-
-import java.util.List;
-
-public class Building {
-
-    private String address;
-    private List<Room> rooms;
-    
-    public class Room {
-        
-        public String getBuildingAddress() {
-            return Building.this.address;
-        }
-        
-    }
-    
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/composition/BuildingWithDefinitionRoomInMethod.java

@@ -1,28 +0,0 @@
-package com.baeldung.relationships.composition;
-
-public class BuildingWithDefinitionRoomInMethod {
-
-    public Room createAnonymousRoom() {
-        return new Room() {
-            @Override
-            public void doInRoom() {}
-        };
-    }
-
-    public Room createInlineRoom() {
-        class InlineRoom implements Room {
-            @Override
-            public void doInRoom() {}
-        }
-        return new InlineRoom();
-    }
-    
-    public Room createLambdaRoom() {
-        return () -> {};
-    }
-
-    public interface Room {
-        void doInRoom();
-    }
-
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/university/Department.java

@@ -1,9 +0,0 @@
-package com.baeldung.relationships.university;
-
-import java.util.List;
-
-public class Department {
-
-    private List<Professor> professors;
-
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/university/Professor.java

@@ -1,10 +0,0 @@
-package com.baeldung.relationships.university;
-
-import java.util.List;
-
-public class Professor {
-
-    private List<Department> department;
-    private List<Professor> friends;
-    
-}

core-java-modules/core-java-lang-oop-3/src/main/java/com/baeldung/relationships/university/University.java

@@ -1,9 +0,0 @@
-package com.baeldung.relationships.university;
-
-import java.util.List;
-
-public class University {
-
-    private List<Department> department;
-    
-}