[BAEL-15993] - Move articles out of core-java pt 3

core-java-modules/core-java-jar/README.md

@@ -0,0 +1,9 @@
+## Core Java JAR
+
+This module contains articles about JAR files
+
+### Relevant Articles: 
+
+- [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)
+- [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
+- [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)

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

@@ -15,4 +15,5 @@ This module contains articles about Object-oriented programming (OOP) in Java
 - [Composition, Aggregation, and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)
 - [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-operators/README.md

@@ -1,3 +1,7 @@
+## Core Java Operators
+
+This module contains articles about Java operators
+
 ## Relevant Articles:
 - [Guide to the Diamond Operator in Java](https://www.baeldung.com/java-diamond-operator)
 - [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)
@@ -6,4 +10,5 @@
 - [A Guide to Increment and Decrement Unary Operators in Java](https://www.baeldung.com/java-unary-operators)
 - [Java Compound Operators](https://www.baeldung.com/java-compound-operators)
 - [The XOR Operator in Java](https://www.baeldung.com/java-xor-operator)
+- [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)
 

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

@@ -11,4 +11,5 @@ This module contains articles about Java syntax
 - [Java Double Brace Initialization](https://www.baeldung.com/java-double-brace-initialization)
 - [The Java Native Keyword and Methods](https://www.baeldung.com/java-native)
 - [Variable Scope in Java](https://www.baeldung.com/java-variable-scope)
+- [Introduction to Basic Syntax in Java](https://www.baeldung.com/java-syntax)
 - [[<-- Prev]](/core-java-modules/core-java-lang-syntax)

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

@@ -4,7 +4,6 @@
 - [Java Timer](http://www.baeldung.com/java-timer-and-timertask)
 - [A Guide To Java Regular Expressions API](http://www.baeldung.com/regular-expressions-java)
 - [Getting Started with Java Properties](http://www.baeldung.com/java-properties)
-- [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)
 - [Introduction to Nashorn](http://www.baeldung.com/java-nashorn)
 - [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
 - [JVM Log Forging](http://www.baeldung.com/jvm-log-forging)
@@ -21,24 +20,19 @@
 - [ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)
 - [What is the serialVersionUID?](http://www.baeldung.com/java-serial-version-uid)
 - [A Guide to the ResourceBundle](http://www.baeldung.com/java-resourcebundle)
-- [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
 - [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
 - [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
 - [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
 - [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
 - [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
 - [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
-- [Abstract Classes in Java](https://www.baeldung.com/java-abstract-class)
 - [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)
 - [Graphs in Java](https://www.baeldung.com/java-graphs)
 - [Read and Write User Input in Java](http://www.baeldung.com/java-console-input-output)
 - [Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
 - [Retrieve Fields from a Java Class Using Reflection](https://www.baeldung.com/java-reflection-class-fields)
-- [Introduction to Basic Syntax in Java](https://www.baeldung.com/java-syntax)
 - [Using Curl in Java](https://www.baeldung.com/java-curl)
 - [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
-- [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)
-- [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)
 - [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)
 - [How to Find an Exception’s Root Cause in Java](https://www.baeldung.com/java-exception-root-cause)
 - [Convert Hex to ASCII in Java](https://www.baeldung.com/java-convert-hex-to-ascii)