Merge pull request #14198 from edizor/master

Update README

core-java-modules/core-java-collections-list-5/README.md

@@ -9,3 +9,4 @@ This module contains articles about the Java List collection
 - [Check if a List Contains an Element From Another List in Java](https://www.baeldung.com/java-check-elements-between-lists)
 - [Array vs. List Performance in Java](https://www.baeldung.com/java-array-vs-list-performance)
 - [Set Default Value for Elements in List](https://www.baeldung.com/java-list-set-default-values)
+- [Get Unique Values From an ArrayList In Java](https://www.baeldung.com/java-unique-values-arraylist)

core-java-modules/core-java-collections-maps-6/README.md

@@ -1,3 +1,5 @@
 ## Relevant Articles
 - [Copying All Keys and Values From One Hashmap Onto Another Without Replacing Existing Keys and Values](https://www.baeldung.com/java-copy-hashmap-no-changes)
 - [Convert Hashmap to JSON Object in Java](https://www.baeldung.com/java-convert-hashmap-to-json-object)
+- [Converting Map<String, Object> to Map<String, String> in Java](https://www.baeldung.com/java-converting-map-string-object-to-string-string)
+- [Converting Object To Map in Java](https://www.baeldung.com/java-convert-object-to-map)

core-java-modules/core-java-concurrency-basic-3/README.md

@@ -7,4 +7,5 @@ This module contains articles about basic Java concurrency.
 - [How to Handle InterruptedException in Java](https://www.baeldung.com/java-interrupted-exception)
 - [Thread.sleep() vs Awaitility.await()](https://www.baeldung.com/java-thread-sleep-vs-awaitility-await)
 - [Is CompletableFuture Non-blocking?](https://www.baeldung.com/java-completablefuture-non-blocking)
+- [Returning a Value After Finishing Thread’s Job in Java](https://www.baeldung.com/java-return-value-after-thread-finish)
 - [[<-- Prev]](../core-java-concurrency-basic-2)