Merge pull request #11378 from johnA1331/master

BAEL-42938 - add links to github-baeldung articles

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

@@ -10,3 +10,4 @@ This module contains articles about string APIs.
 - [CharSequence vs. String in Java](https://www.baeldung.com/java-char-sequence-string)
 - [StringBuilder vs StringBuffer in Java](https://www.baeldung.com/java-string-builder-string-buffer)
 - [Generate a Secure Random Password in Java](https://www.baeldung.com/java-generate-secure-password)
+- [Getting a Character by Index From a String in Java](https://www.baeldung.com/java-character-at-position)

docker/README.md

@@ -4,3 +4,4 @@
 - [Reusing Docker Layers with Spring Boot](https://www.baeldung.com/docker-layers-spring-boot)
 - [Running Spring Boot with PostgreSQL in Docker Compose](https://www.baeldung.com/spring-boot-postgresql-docker)
 - [How To Configure Java Heap Size Inside a Docker Container](https://www.baeldung.com/ops/docker-jvm-heap-size)
+- [Dockerfile Strategies for Git](https://www.baeldung.com/ops/dockerfile-git-strategies)

java-collections-maps-3/README.md

@@ -5,3 +5,4 @@
 - [Using the Map.Entry Java Class](https://www.baeldung.com/java-map-entry)
 - [Optimizing HashMap’s Performance](https://www.baeldung.com/java-hashmap-optimize-performance)
 - [Update the Value Associated With a Key in a HashMap](https://www.baeldung.com/java-hashmap-update-value-by-key)
+- [Java Map – keySet() vs. entrySet() vs. values() Methods](https://www.baeldung.com/java-map-entries-methods)

persistence-modules/spring-data-cassandra-2/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Using Test Containers With Spring Data Cassandra](https://www.baeldung.com/spring-data-cassandra-test-containers)