Tarun Telang

As of November 2021, Oracle JDK 17 is the newest Long Term Support (LTS) version.

In addition, these tools/technologies also leverage YAML data serialization format:

- AWS Lambda & Serverless

- GitLab

- GitHub Actions & Workflows

- OpenShift

- HELM

- Istio

- Google Cloud

- SonarCloud

- SAP Hana

- Mule 4

- Vert.x

- Hyperledger Fabric 2.x

- Pivotal Cloud Foundry

- Jaeger

I am sure I would have missed many tools and technologies. Feel free to add to this list in the comments section.

Another Practical Application of Linked Lists is playlist in a music player.

LRU Cache implementation is one of the use cases where we may find using a (doubly) LinkedList critical. Proves they are really useful in some practical scenarios.

Waiting eagerly to see them converge, with Spring Framework 6 moving to Jakarta EE 9+ planned Q3 2021.

Definitely, I assumed readers are visiting this site already as they are going through this article. Thanks for pointing this, would include it in my next update.

DZone Java Zone for tools, tutorials and news on Java technology.

In my perspective, they were separate sites contained with a portal Oracle.com. However, I understand the exact terminology and its common usage could be different. Thanks for pointing this out.

To get News related Follow @java on Twitter by visiting this URL- https://twitter.com/java and join r/java channel on https://www.reddit.com/r/java/.

Below are a few community-curated lists of Java tutorials:

- https://gitconnected.com/learn/java

- https://hackr.io/tutorials/learn-java

Thanks, Rossitsa for your comments. The idea was to point to the exact resource so a naive user is not lost in overwhelming content from Oracle. Java developers might want to bookmark these separately in their browser to save time as they would need to access these frequently.

It now supports the following list of frameworks for developing applications by default. NodeJS, Angular, Apache Camel K, Spring Boot, Mainframe, C/C++, .NET Core, ASP.NET, Go, Java, Gradle, Maven, MongoDB, MySQL, Express, React, Yarn, Laravel, PHP, Symfony, Rust, Scala, Quarkus (https://en.wikipedia.org/wiki/Eclipse_Che#Supported_Languages_and_Frameworks).

Currently Condenvy redirects you to https://che.openshift.io/.. As RedHat is acquiring codenvy.

Below is 10 more unofficial links with good Java tutorials, they might not be updated as per the latest Java versions but still contains valuable information:
- W3Schools - Java Home
- Tutorialspoint - Java 8
- javatpoint.com | Lean Java
- Programiz - Learn Java Programming
- guru99 - Java Tutorial for Beginners
- LearnJavaOnline.org Interactive Java Tutorial.
- geeksforgeeks.org | Java Programming Language
- vogella.com | Java Tutorials
- baeldung.com | https://www.baeldung.com/java-tutorial
- RoseIndia.net | Java Example Code and Tutorials

Thanks for sharing about this resource. In addition to Java Programming articles, It also contains good resources on the Spring framework.

Thanks Luca, for sharing about roseindia.net. The tutorials here are updated with Java 7.

It's still active --> https://coderanch.com/c/java check this out. I am pretty sure Many readers might still found useful resources here.

For getting your queries on Java programming answered quickly by experts from the community, you should post it over stackoverflow.com with java tag at this URL --> https://stackoverflow.com/questions/tagged/java.

For shrinking scenario, we can use trimToSize() method provided to reduce wastage of memory in ArrayList.

LinkedLists would also have a higher overhead for smaller lists due to L2 cache misses of the processor. This could be higher than call to System.arraycopy() within internal array of an ArrayList.

Great point Dieter, There are some scenarios involving concurrent access to elements were LinkedList is better suited. Also if you perform multiple operations on multiple items in a single iteration then the overhead of iterations can lesser than that of copying array element multiple times.

And here is a complete session discussion over this conversation -> https://www.youtube.com/watch?v=Y4XkWSAm2XU.

When you cannot assume the size still making a rough estimate and passing the initial capacity in the constructor while instantiating a list is a good idea.

Thanks for sharing a real-world scenario where LinkedList would be preferred over ArrayList.

Hi Dang, thanks for sharing about your performance issue. It would be great inputs for others if you can also elaborate more about your list size and item type for the data it contained and frequency of add/remove of items etc. ?

Thanks Ivan for sharing these insights from the JVM memory management perspective.

As it is also rare in the real-world situation that we need to add items frequently in the middle of the list. It's could be worth listing scenarios where frequent addition of items in the middle is required.

Here's a great discussion on whether LinkedList should be deprecated, -> https://twitter.com/drdeprecator/status/668447303481495552?lang=en. It also contains some pointers to other efficient implementation worth considering like GlueList, Optimized ObjectLayout data structure and Linked arraylet.

Thanks, Federico for sharing insights from your experiences.

Have updated the table in this article mentioning the fixed cost for these special cases of accessing a first and last element in Linked List.

Thanks, Michael for sharing this post containing performance benchmarks, definitely seeing real numbers would further help readers get the most out of this article.

Great point. For a LinkedList with large number of items spread out all over the heap, the time taken could be higher as it is more likely to encounter cache misses (involving cache swip in / out using virtual memory).

Correct adding/removing items takes O(n) time on the average case. Adding and removing items in LinkedList in Java would take constant time as it maintains references to the first and last element. Thanks Michael for sharing more insights.

Looks it was a temporary/occasional error, trying again worked. The link for pre-approved photos is correct.

I am getting "502 Bad Gateway" error on clicking the link of pre-approved photos here. Can you please update the correct link. Thanks

>> walkmod add -R sonar:DeclarationsShouldUseCollectionInterfaces

On executing the command above the following error below is encountered.

Please advice how can i resolve this

INFO [main] - Java version: 1.8.0_91 INFO [main] - Java Home: C:\Program Files\Java\jdk1.8.0_91\jre INFO [main] - OS: Windows 7, Vesion: 6.1 ERROR [main] - The content of element type "walkmod" must match "(param*,modules?,plugins?,conf-providers?,merge-policies?,(chain*|transformation*))". at (null:12:11) INFO [main] - Plugin installations fails. 

Best Regards