Codetown is a software developer's community. It's a technical networking and educational group focused on software development.

Photos

  • Add Photos
  • View All

JavaSpecialists

Issue 327 - ShuffleGatherer

Instead of shuffling our stream at the end in the collect() method, we can also shuffle it in stages using the new stream gatherers. This allows us to shuffle sections at a time and even support infinite streams.

Issue 326 - Stream Gathering with a Different Distinct Function

A few years ago, we tried to create a new distinct() function for a Stream. It wasn't pretty. In this newsletter we revisit that adventure using the new Stream Gatherers from Java 24.

Issue 325 - Be a Distinguished Java Engineer in the Age of Vibe Coding

We are all amazed how AI can help us in everyday tasks. It can even write Java code. But "Show me the Pull Requests" (Evans) sums it up nicely. We do not (yet) see AI massively improving open source projects.

Issue 324 - Sequenced LinkedHashSet

LinkedHashSet implements the SequencedCollection interface, allowing us to addLast(), addFirst() and even reverse the collection. This sometimes causes some surprises.

Issue 323 - Visiting All Threads (Including Virtual)

In this newsletter, we explore how we can visit the entire hierarchy of threads in our virtual machine, including virtual threads. We do this using the composite, visitor and facade design patterns.


Badge

Loading…

Who Reads Codetown?

 

Events

Blog Posts

New Java features

Posted by Michael Levin on August 29, 2025 at 5:32pm 0 Comments

August 28 2025, Newsletter no. 297 (this newsletter is available in html format at http://www.javaperformancetuning.com/news/news297.shtml )



As usual before a Java release, I'm listing all the new…

Continue

Free Eclipse book, recently published

Posted by Michael Levin on August 24, 2025 at 11:59am 0 Comments

Hi Everyone,
My publisher is running a free Amazon Kindle book promotion through Monday, August 25th, 2025. The book, “Eclipse Collections Categorically: Level up your programming game” can be obtained for $0 on Kindle on Amazon through the August 25th.…
Continue

What is vibe coding?

Posted by Michael Levin on June 9, 2025 at 9:37am 0 Comments

Vibe coding isn’t a formal technical term, but it’s become a slang or colloquial expression among programmers and tech communities—especially on social media and in creative coding circles.

What “vibe coding” usually means:

  1. Coding based on intuition or feel

    Instead of rigidly planning everything out, you’re:

    • Freestyling as you…
Continue

Next OJUG and GatorJUG Meetings will be fabulous - Check out the Codetown Events

Watch for details on our upcoming meetings. OrlandoJUG meeting's fall on the 4th Thursday of every month, in case you want to mark your calendars. Stay tuned for details! GatorJUG meets the 2nd Wednesday of every month.


The details are posted in the CodeTown Events section. Please RSVP so we'll know how much pizza to order. Stay tuned! ...Mike

Groups

Forum

Java books for any library 5 Replies

What books should be on the bookshelf of EVERY Java programmer, no matter what specific technologies they are working on?The two that come to my mind areThinking in JavaJava Concurrency in PracticeWhat else am I missing?Continue

Started by David Moskowitz in Java. Last reply by sneha gulati Feb 8, 2019.

Error trying to use Fragment

I am new to Android.  I have been working thru some examples in a book called  Head First Android Development.  I entered a small program using fragments and get a Casting Error.cannot cast andoid.app.fragment to…Continue

Tags: Fragment

Started by Robert Sobol in Java Oct 10, 2017.

Fragment Syntax Problem

My name is Rob Sobol.I have been working through a book called Head First Android Development.I hit a syntax error in a simple exercise that uses one fragment. I have been trying to figure out the error for days.  I am hoping some in the forum can…Continue

Tags: Fragments

Started by Robert Sobol in Java Oct 10, 2017.

Hadoop getting old?

An article just came out in InfoWorld about trends, which is always an interesting subject. Funny, they said Hadoop wasn't hot. Spark is. It's a good read. …Continue

Tags: codetown, infoworld, programming, hadoop, trends

Started by Michael Levin in Trends Apr 10, 2017.

What's functional programming, anyway?

Can you believe people are still trying to come up with a good definition or explanation of what functional programming is? Paul Krill is a journalist with InfoWorld. Here's an article he just wrote: …Continue

Tags: functions., codetown, lambdas, clojure, programming

Started by Michael Levin in Functional Programming Feb 21, 2016.

Santafe College 2 Replies

Santafe just added a new BAS  bachelor's program of study. 5651  ProgrammingContinue

Started by Dan Lackey in Dynamic Languages. Last reply by Michael Levin Feb 15, 2016.

Using SQL with Node,.js 1 Reply

All the tutorials and books for node.js seem to use Mongo as the database.  I am not sold on 'document' databases and would like to know how difficult it is to use any version for plain old tried-and-true SQL with Node.js.Does anybody have any…Continue

Tags: 'document, databases', SQL, node, node.js

Started by Kevin Neelands in Dynamic Languages. Last reply by Lou Caudell Nov 10, 2015.

The advantages of a RESTfull web-based API 5 Replies

I need to get a better handle on the advantages of a RESTful web-based API.  People tell me they scale better than other methods, but I don't see how they reduce database access or have any other feature that helps handle large amounts of traffic.…Continue

Tags: API', 'web-based, RESTful

Started by Kevin Neelands in Dynamic Languages. Last reply by Kevin Neelands Oct 25, 2015.

Want a Job? 1 Reply

Hi, Not sure if this is the appropriate place to post this sort of things (forgive me if its not). My company (really nice company btw) is looking to hire two junior and two senior Java Developers. Please forward me your resume to slaassel@gmail.com…Continue

Started by Saad Laassel in Java. Last reply by Theresa Wizorek-MacIntyre Oct 15, 2014.

Storing Sensitive Data ( like SSNs ) 1 Reply

We might have to store Social Security Numbers.  We REALLY don't want to do this in our own database, we'd like some external 'vault' service that stores them encrypted and getting to them is difficult.  Does anyone have any ideas along these lines?Continue

Started by Kevin Neelands in Java. Last reply by Michael Levin May 7, 2014.

Members

Latest Activity

Michael Levin posted a blog post

New Java features

August 28 2025, Newsletter no. 297 (this newsletter is available in html format at http://www.javaperformancetuning.com/news/news297.shtml )As usual before a Java release, I'm listing all the new performance features in the upcoming release, this time for Java…See More
27 minutes ago
Profile IconPercy Vega and Karuna Drishti joined Codetown
7 hours ago
Krishna Metlab updated their profile
Wednesday
Krishna Metlab is now a member of Codetown
Monday
Michael Levin posted a blog post

Free Eclipse book, recently published

Hi Everyone,My publisher is running a free Amazon Kindle book promotion through Monday, August 25th, 2025. The book, “Eclipse Collections Categorically: Level up your programming game” can be obtained for $0 on Kindle on Amazon through the August 25th.https://www.amazon.com/Eclipse-Collections-Categorically-Level-programming-ebook/dp/B0FFM5MHBV/The Kindle…See More
Sunday
Michael Levin posted videos
Aug 11
Michael Levin added a discussion to the group OrlandoJUG Town
Thumbnail

See Y’all soon, I hope!

Hello Juggies! The time has come for someone else to take the reins with this group. It’s been incredibly rewarding for over 20 years and I thank all of you for your contributions. Hopefully I will see many of you at the next meet up.Best regards,MikeSee More
Aug 9
Michael Levin commented on Michael Levin's group GatorJUG Town
"Hello Juggies! The time has come for someone else to take the reins with this group. It’s been incredibly rewarding for over 20 years and I thank all of you for your contributions. Hopefully I will see many of you at the next meet up. Best…"
Aug 9
Michael Levin posted a video

Don Swanson's Paper on Undiscovered Public Knowledge | INNER COSMOS WITH DAVID EAGLEMAN

🛎 If You're New Subscribe ► https://bit.ly/InnerCosmosPodSubscribeThis clip is from Ep 112: How is computer code like magic? (with Sam Arbesman) | INNER CO...
Jul 21
Michael Levin posted a video

What We Get Wrong About AI (feat. former Google CEO)

AI is here. Now what?Subscribe to support optimistic tech journalism!Everyone’s talking about artificial intelligence and machine learning. There are lots of...
Jul 9
Michael Levin posted a blog post

What is vibe coding?

Vibe coding isn’t a formal technical term, but it’s become a slang or colloquial expression among programmers and tech communities—especially on social media and in creative coding circles.What “vibe coding” usually means:Coding based on intuition or feel Instead of rigidly planning everything out, you’re:Freestyling as you codeTrusting your gutLetting ideas evolve naturallyFollowing the “vibe” of what feels right in the momentFlow state or artistic mindset It’s often associated with being in a…See More
Jun 9
Michael Levin posted a video

Mark Cuban: Why Lifelong Learning is the Key to Success.

Mark Cuban reveals why being a lifelong learner is essential to success. Building anything great requires relentless learning and hard work — no shortcuts. H...
Jun 4
Michael Levin posted a photo
Jun 4
Michael Levin posted a blog post
Mar 25
Michael Levin posted a video

LOCAL Private Telephone System (PBX) with USA number for $1 a month

Thank you to 3CX for sponsoring this video. To try 3CX Pro for free for two months sign up using the following link: https://www.3cx.com/signup/?src=davidb...
Mar 10
SEO Services Philippines updated their profile
Jan 25
Bottling Machine updated their profile
Jan 22
Michael Levin posted a status
Aug 23, 2024
Michael Levin posted a video

Haseeb Qureshi: Doing Good with Your Career

Haseeb Qureshi, notable App Academy graduate, cryptocurrency expert, and philanthropist will be giving a talk on Effective Altruism for App Academy students ...
Aug 3, 2024
Michael Levin liked Hugh Jack's blog post 50% Keyboard Guide: Tiny Typists' Delight
Jun 20, 2024
 
 
 

Happy 10th year, JCertif!

Notes

Welcome to Codetown!

Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.

When you create a profile for yourself you get a personal page automatically. That's where you can be creative and do your own thing. People who want to get to know you will click on your name or picture and…
Continue

Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.

Looking for Jobs or Staff?

Check out the Codetown Jobs group.

 

Enjoy the site? Support Codetown with your donation.



InfoQ Reading List

Uber Eats Introduces INCA to Scale Catalog Management from Restaurants to Retail

Uber Eats introduced INCA (Inventory and Catalog), a scalable system to handle vast product catalogs from supermarkets, pharmacies, and retail partners. Unlike the earlier restaurant-focused setup built for low SKUs and simple pass-through data, INCA supports large-scale inventories, rich metadata, and compliance needs essential for retail operations.

By Leela Kumili

Airbnb Executes Istio Upgrades at Massive Scale

Airbnb engineering has published a detailed account of how it maintains high availability during Istio upgrades across tens of thousands of pods and thousands of VMs, all without downtime.

By Craig Risi

Presentation: Extreme DevOps Automation

Sérgio Amorim shares how Revolut’s small DevOps team leverages a centralized systems catalog and automation to enable 1,300 engineers to build and deploy applications with speed and consistency. He explains how this approach reduces manual effort and improves observability, alerting, and database management at scale.

By Sérgio Amorim

AWS Launches Memory-Optimized EC2 R8i and R8i-flex Instances with Custom Intel Xeon 6 Processors

AWS has launched its eighth-generation Amazon EC2 R8i and R8i-flex instances, powered by custom Intel Xeon 6 processors. Designed for memory-intensive workloads, these instances offer up to 15% better price performance and enhanced memory throughput, making them ideal for real-time data processing and AI applications.

By Steef-Jan Wiggers

Article: MCP: The Universal Connector for Building Smarter, Modular AI Agents

In this article, authors discuss Model Context Protocol (MCP), an open standard designed to connect AI agents with tools and data they need. They also talk about how MCP empowers agent development, and its adoption in leading open-source frameworks.

By Sanjay Surendranath Girija, Lakshit Arora, Shashank Kapoor

© 2025   Created by Michael Levin.   Powered by

Badges  |  Report an Issue  |  Terms of Service