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

* Creation

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

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

* Moved code from https://www.baeldung.com/java-cannot-reference-x-before-supertype-constructor-error

* Moved article references to the new README.md

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

@@ -4,15 +4,12 @@ This module contains articles about Object-oriented programming (OOP) in Java
 
 ### Relevant Articles: 
 - [Generic Constructors in Java](https://www.baeldung.com/java-generic-constructors)
-- [Cannot Reference “X” Before Supertype Constructor Has Been Called](https://www.baeldung.com/java-cannot-reference-x-before-supertype-constructor-error)
 - [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
 - [Raw Types in Java](https://www.baeldung.com/raw-types-java)
 - [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](https://www.baeldung.com/java-immutable-object)
 - [Inheritance and Composition (Is-a vs Has-a relationship) in Java](https://www.baeldung.com/java-inheritance-composition)
-- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
 - [Static and Default Methods in Interfaces in Java](https://www.baeldung.com/java-static-default-methods)
-- [Java Copy Constructor](https://www.baeldung.com/java-copy-constructor)
 - [Abstract Classes in Java](https://www.baeldung.com/java-abstract-class)
 - [[<-- Prev]](/core-java-modules/core-java-lang-oop)[[More -->]](/core-java-modules/core-java-lang-oop-3)

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

@@ -0,0 +1,8 @@
+## Core Java Lang OOP - Constructors
+
+This module contains article about constructors in Java
+
+### Relevant Articles:
+- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
+- [Java Copy Constructor](https://www.baeldung.com/java-copy-constructor)
+- [Cannot Reference “X” Before Supertype Constructor Has Been Called](https://www.baeldung.com/java-cannot-reference-x-before-supertype-constructor-error)

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

@@ -0,0 +1,28 @@
+<?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">
+    <parent>
+        <artifactId>core-java-lang-oop-modules</artifactId>
+        <groupId>com.baeldung.core-java-lang-oop-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-lang-oop-constructors</artifactId>
+    <name>core-java-lang-oop-constructors</name>
+    <packaging>jar</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+</project>

core-java-modules/core-java-lang-oop-modules/core-java-lang-oop-constructors/src/main/java/com/baeldung/constructors/BankAccount.java

@@ -6,7 +6,7 @@ class BankAccount {
     String name;
     LocalDateTime opened;
     double balance;
-    
+
     @Override
     public String toString() {
         return String.format("%s, %s, %f", this.name, this.opened.toString(), this.balance);
@@ -47,14 +47,13 @@ class BankAccountCopyConstructor extends BankAccount {
         this.opened = opened;
         this.balance = balance;
     }
-        
+
     public BankAccountCopyConstructor(BankAccount other) {
         this.name = other.name;
         this.opened = LocalDateTime.now();
         this.balance = 0.0f;
     }
 }
-
 class BankAccountChainedConstructors extends BankAccount {
     public BankAccountChainedConstructors(String name, LocalDateTime opened, double balance) {
         this.name = name;
@@ -65,4 +64,4 @@ class BankAccountChainedConstructors extends BankAccount {
     public BankAccountChainedConstructors(String name) {
         this(name, LocalDateTime.now(), 0.0f);
     }
-}
+}

core-java-modules/core-java-lang-oop-modules/core-java-lang-oop-constructors/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java

@@ -1,20 +1,19 @@
 package com.baeldung.constructors;
 
+import org.assertj.core.api.Assertions;
 import org.junit.Test;
 
 import java.time.LocalDateTime;
 import java.time.Month;
-import java.util.logging.Logger;
 
-import static org.assertj.core.api.Assertions.*;
+import static org.assertj.core.api.Assertions.assertThat;
 
 public class ConstructorUnitTest {
-    final static Logger LOGGER = Logger.getLogger(ConstructorUnitTest.class.getName());
-
+    
     @Test
     public void givenNoExplicitContructor_whenUsed_thenFails() {
         BankAccount account = new BankAccount();
-        assertThatThrownBy(() -> {
+        Assertions.assertThatThrownBy(() -> {
             account.toString();
         }).isInstanceOf(Exception.class);
     }
@@ -22,7 +21,7 @@ public class ConstructorUnitTest {
     @Test
     public void givenNoArgumentConstructor_whenUsed_thenSucceeds() {
         BankAccountEmptyConstructor account = new BankAccountEmptyConstructor();
-        assertThatCode(() -> {
+        Assertions.assertThatCode(() -> {
             account.toString();
         }).doesNotThrowAnyException();
     }
@@ -33,7 +32,7 @@ public class ConstructorUnitTest {
         BankAccountParameterizedConstructor account =
                 new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
 
-        assertThatCode(() -> {
+        Assertions.assertThatCode(() -> {
             account.toString();
         }).doesNotThrowAnyException();
     }

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

@@ -9,7 +9,12 @@
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
-    <artifactId>core-java-oop-modules</artifactId>
-
+    <groupId>com.baeldung.core-java-lang-oop-modules</groupId>
+    <artifactId>core-java-lang-oop-modules</artifactId>
+    <name>core-java-lang-oop-modules</name>
+    <packaging>pom</packaging>
 
+    <modules>
+        <module>core-java-lang-oop-constructors</module>
+    </modules>
 </project>