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Issue 285 - I/O Stream Memory Overhead

Each PrintStream uses about 25kb of memory. This might seem reasonable if we only have System.out and System.err. But what happens if we try create millions? And why do they use so much memory?

Issue 284 - java.util.PrimitiveIterator.OfInt

Java 8 Streams were the first time that Java deliberately split utility classes into multiple versions to be used for Object, int, long and double. This design was also applied to Iterator, which now has specialized types for these primites in the form of the PrimitiveIterator. In this newsletter we have a look at how we can use that in our own primitive collections.

Issue 283 - Four Billion Changes

A nice puzzle to brighten your day - how can we make the Iterator think that the List has not been changed?

Issue 282 - Biased locking a goner, but better things Loom ahead

Biased locking has made unnecessary mutexes cheap for over a decade. However, it is disabled by default in Java 15, slated for removal. From Java 15 onwards we should be more diligent to avoid synchronized in places where we do not need it.

Issue 281 - Puzzle 2: Is it garbage?

In our next puzzle, we up the ante a bit. We prevent GC during the test() method by storing a strong reference to all our Vectors. Cock and bull story, or are we struggling to identity our biases?


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J4K is virtual this year...and free!

Posted by Michael Levin on July 2, 2020 at 6:52pm 0 Comments

J4K was a superb conference last year. This year, it’s virtual and free! Some of the world’s best speakers will present. Register here: http://j4k.io/ They say tickets will go fast. #j4k 

Dev Dot Next Webinar!

Posted by Michael Levin on March 24, 2020 at 7:44am 0 Comments

Dev.Next will run their online event this Tuesday, 24 March, starting at 12 pm EDT.

https://www.devdotnext.com/digital



Oracle is hosting a webinar on Java 14 next Thursday, 26 March from 2-2:30 pm EDT, which will cover some of the new features:…



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Hackathon

Posted by Michael Levin on January 11, 2020 at 2:06am 0 Comments

From Zach:

“Hey Mike, I am helping organize an upcoming hackathon at Palm Coast City hall and want to invite your group of devs to attend and compete. There is a $12k prize pool as well as raffle prizes and free food all weekend long. This is a free event and any and all experience is welcome to come check it out. The event website is TechBeachHackathon.com for all the details.”

Mobile Vendor Market Share

Posted by Ismail Jones on September 17, 2019 at 11:09pm 0 Comments

Source: https://www.computerspluscellphones.com/top-five-mobile-vendors/

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

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Be Careful What You Wish For

Interesting. Ask Elon Musk what scares him…Continue

Tags: Braintree, PayPal, kernal, google, neuralink

Started by Michael Levin in AI, ML & Big Data Aug 8, 2019.

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AITP-NCFL November 2020 Presentation at Zoom

September 22, 2020 from 6pm to 8pm
Join us in welcoming Anthony Sequeira of ITProTV as he presents “An Introduction to Cisco Application Centric Infrastructure“.The public is welcome and there is no charge to view this Zoom presentation. Reserve your spot today at aitp-ncfl.org/eventsSee More
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JFuture 2020 Online Conference at Online

October 23, 2020 to October 24, 2020
A Java-focused conference from Belarus, @jfuturedev, now goes online and it means international!Join the event on October 23-24 from any part of the planet. Grab your early bird ticket at 17 EUR only and join the event!…See More
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Joe Rogan Experience #1169 - Elon Musk

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AITP-NCFL July 2020 Presentation at Zoom

July 28, 2020 from 6pm to 8pm
For our July 2020 meeting we are delighted to host Don Pezet of ITProTV as he presents “Manage Your Change Control Process with Git”.The presentation will start Tuesday, July 28, 2020 at 6 PM via Zoom meeting (ID number 976 0937 0079).See the meeting flyer at for more details, or…See More
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J4K is virtual this year...and free!

J4K was a superb conference last year. This year, it’s virtual and free! Some of the world’s best speakers will present. Register here: http://j4k.io/ They say tickets will go fast. #j4k See More
Jul 2
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J4K is virtual this year!

‪J4K was a superb conference last year. This year, it’s virtual and free! Some of the world’s best speakers will present. Register here: http://j4k.io/ They say tickets will go fast. #j4k ‬
Jul 2
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Virtual Events

‪Hello! I hope you all are well. I’m staying home for a while, but the Virtual Java User Group and JaxJUG have interesting online events coming up this week. Stay tuned. ...Mike‬
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.Net Town

What's up with .Net in your neck of the woods? We'll discuss all the basics here. Eventually, we'l break out separate groups for C#, etc...
Apr 13
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Dev Dot Next Webinar!

Dev.Next will run their online event this Tuesday, 24 March, starting at 12 pm EDT.https://www.devdotnext.com/digitalOracle is hosting a webinar on Java 14 next Thursday, 26 March from 2-2:30 pm EDT, which will cover some of the new features:https://go.oracle.com/LP=89726?elqCampaignId=240340&src1=:em:lw:ie:pt:SEV400037003See More
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AITP-NCFL (Gainesville) March 2020 Presentation at ITProTV

March 24, 2020 from 6pm to 8pm
For our March 2020 meeting we are delighted to host Anthony Sequeira of ITProTV as he presents "An Introduction to Cisco Application Centric Infrastructure". The meeting will take place Tuesday, March 24, 2020 from 6 to 8 PM, at the ITProTV campus, 7525 NW 4th Blvd in Gainesville. There is no charge to attend this presentation, but reservations are requested. For more information view the…See More
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Cloud expert needed

My company, www.cwd.wtf has an immediate need for a cloud computing specialist to install a proprietary application in an XP environment. Salary is $150/hr. Cambridge is an EOE employer. Send your reply via Codetown. See More
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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…
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Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.

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Check out the Codetown Jobs group.

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InfoQ Reading List

Podcast: Emily Jaksch on the Myths, Misconceptions and Realities of the Millennial Generation

In this podcast Shane Hastie, Lead Editor for Culture & Methods, spoke to Emily Jaksch about the Myths, Misconceptions and Realities of the Millennial Generation.

By Emily Jaksch

Article: Kick-off Your Transformation by Imagining It Had Failed

Large scale change initiatives have a worryingly high failure rate. A chief reason for which is that serious risks are not identified early. One way to create the safety needed for everyone to speak openly about the risks they see is by running a pre-mortem. In a pre-mortem, we assume that the transformation had already failed and walk backward from there to investigate what led to the failure.

By Ayman Idris

Presentation: InfoQ Live Roundtable: Observability Patterns for Distributed Systems

The panelists explore how a sound observability strategy can help mitigate operational costs, and avoiding common pitfalls in monitoring distributed systems.

By Thomas Betts

Microsoft Edge Made Available on Linux

Microsoft recently announced the availability of the Microsoft Edge Dev Channel for Linux (initial preview release). The Edge browser is now available on all major operating systems, desktop and mobile. Enterprise developers, many of which use Linux, may now build and test web applications in their preferred platform. The move seeks to further position Edge as the browser for business.

By Bruno Couriol

Presentation: Automating Chaos Attacks

Daniel Albuquerque, Nikos Katirtzis show how to run attacks in both manual and automated ways.

By Daniel Albuquerque, Nikos Katirtzis

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