Merge pull request #12873 from edizor/master

Update README.md

core-java-modules/core-java-arrays-operations-basic/README.md

@@ -10,3 +10,4 @@ This module contains articles about Java array fundamentals. They assume no prev
 - [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)
 - [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
 - [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)
+- [Initializing a Boolean Array in Java](https://www.baeldung.com/java-initializing-boolean-array)

core-java-modules/core-java-collections-4/README.md

@@ -10,3 +10,4 @@
 - [Create an Empty Map in Java](https://www.baeldung.com/java-create-empty-map)
 - [Sorting Objects in a List by Date](https://www.baeldung.com/java-sort-list-by-date)
 - [Fixed Size Queue Implementations in Java](https://www.baeldung.com/java-fixed-size-queue)
+- [Difference Between Java Enumeration and Iterator](https://www.baeldung.com/java-enumeration-vs-iterator)

core-java-modules/core-java-collections-set-2/README.md

@@ -0,0 +1,3 @@
+## Relevant articles
+
+- [Using Streams to Collect Into a TreeSet](https://www.baeldung.com/java-stream-collect-into-treeset)

core-java-modules/core-java-io-4/README.md

@@ -12,4 +12,6 @@ This module contains articles about core Java input and output (IO)
 - [Java Scanner.skip method with examples](https://www.baeldung.com/java-scanner-skip)
 - [Generate the MD5 Checksum for a File in Java](https://www.baeldung.com/java-md5-checksum-file)
 - [Getting the Filename From a String Containing an Absolute File Path](https://www.baeldung.com/java-filename-full-path)
+- [Mocking Java InputStream Object](https://www.baeldung.com/java-mocking-inputstream)
 - [[<-- Prev]](/core-java-modules/core-java-io-3)
+

core-java-modules/core-java-lang-5/README.md

@@ -8,3 +8,5 @@ This module contains articles about core features in the Java language
 - [Advantages and Disadvantages of Using Java Wildcard Imports](https://www.baeldung.com/java-wildcard-imports)
 - [Toggle a Boolean Variable in Java](https://www.baeldung.com/java-toggle-boolean)
 - [Handle Classes With the Same Name in Java](https://www.baeldung.com/java-classes-same-name)
+- [Variable Instantiation on Declaration vs. on Constructor in Java](https://www.baeldung.com/java-variable-instantiation-declaration-vs-constructor)
+- [Infinity in Java](https://www.baeldung.com/java-infinity)

core-java-modules/core-java-networking-3/README.md

@@ -13,4 +13,6 @@ This module contains articles about networking in Java
 - [Get the IP Address of the Current Machine Using Java](https://www.baeldung.com/java-get-ip-address)
 - [Get Domain Name From Given URL in Java](https://www.baeldung.com/java-domain-name-from-url)
 - [Java HttpClient Timeout](https://www.baeldung.com/java-httpclient-timeout)
+- [Port Scanning With Java](https://www.baeldung.com/java-port-scanning)
+- [Validating URL in Java](https://www.baeldung.com/java-validate-url)
 - [[<-- Prev]](/core-java-modules/core-java-networking-2)