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Crystal Sheldon

@crystal-l-sheldon.bsky.social

28 followers 49 following 97 posts

Supporter of Computer Science Education with a focus on Java. Check out free Java resources here: Learn.java My posts are my own.

Posts Replies Media

Crystal Sheldon @crystal-l-sheldon.bsky.social · 30/01/2026

🎥 Need quick, effective tutorial videos for your students? We’re regularly adding new bite-sized lessons! Find them in our current playlist (permanent channel coming soon). Have a topic request? Let me know—your feedback drives our content! #learnjava #teachjava www.youtube.com/playlist?app...

Learn.java provides learning tutorials for beginners, students, and teachers of Java. Check https://learn.java

Crystal Sheldon @crystal-l-sheldon.bsky.social · 26/01/2026

Snowed in? Iced in? Learn a new skill at Learn.java!

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 23/01/2026

What's new on Learn.java this week? - We've added two new FRQs (one was late last week): - FRQ 4 2D arrays - Game Board: lnkd.in/dQDMM9Ff - FRQ 3 ArrayList - Efficient Workout: lnkd.in/exgfv9QH

Learn.java: The Destination for Java Beginners, Students, and Teachers

Crystal Sheldon @crystal-l-sheldon.bsky.social · 21/01/2026

Just posted a new #APCSA FRQ for practicing question type 3: Data and ArrayList. Check it out here: learn.java/learning/les...

AP Computer Science A Free Response Practice - Data Analysis and ArrayList - Workout Time - Learn.java

Practice writing code to complete a free response question 3 to analyze workout data in an ArrayList

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 12/01/2026

I've added another practice AP CSA FRQ 4 to Learn.java. Have you students complete and run their code right in the browser. learn.java/learning/les...

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 18/12/2025

What's NEW this week on Learn.java? - Added some tutorial videos to the array and 2D array pages - Added a new AP CSA FRQ 4 on 2D Array (learn.java/teachers/apc...)

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Reposted by Crystal Sheldon

Java @java-devs.bsky.social · 10/10/2025

We've embedded the Java Playground into tutorials and practice! Check it out: social.ora.cl/6013AkVSD

Reposted by Crystal Sheldon

Java @java-devs.bsky.social · 22/10/2025

Hear from Tammy Pirmann, professor from Drexel University, on how she uses students' interests to drive engagement and help students uncover the power of computer science. social.ora.cl/6018fWimM

Reposted by Crystal Sheldon

Java @java-devs.bsky.social · 27/10/2025

Learn how to use pattern matching with records and switch case patterns to write program code that is more readable. social.ora.cl/6019AD9mT

Crystal Sheldon @crystal-l-sheldon.bsky.social · 17/12/2025

A new #APCSA Free Response question for FRQ 4: 2D array has been posted. Check it out: learn.java/learning/les...

AP Computer Science A Free Response Practice - 2D Array - Mutual Connections - Learn.java

Practice writing code to complete a free response question 4 to analyze data in a 2D Array

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 17/12/2025

Lots of teachers get the "what is it like to be a software engineer" question. Jim has many podcasts on Duke's Corner where you can hear from professionals about the work that they do. Loved meeting Chris. He has a great story! Give it a listen!

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 16/12/2025

Just added some video tutorials to our 2D array pages. Tracing through code can help to make meaning of the syntax and make it more concrete. - Introduction to Two-Dimensional Arrays: lnkd.in/eHx9KmnR - Iterating Over Two-Dimensional Arrays: lnkd.in/eFf95Kq6

This link will take you to a page that’s not on LinkedIn

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 16/12/2025

Just added some video tutorials to our Array Learn pages. Tracing through code can help to make meaning of the syntax and make it more concrete. - Introduction to Arrays: learn.java/learning/tut... - Iterating Over Arrays: learn.java/learning/tut...

Introduction to Arrays an AP Computer Science A Topic - Learn.java

Learn how to create an array to store data

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 12/12/2025

What's new on Learn.java this week? - array practice - array tutorial images to illustrate what it looks like - String split method practice - 2D array tutorial - December newsletter - Recording of J Card Visuals with Text Blocks

Learn.java: The Destination for Java Beginners, Students, and Teachers

Crystal Sheldon @crystal-l-sheldon.bsky.social · 10/12/2025

Advent of Code Day 6 part 1 - My solution might be ugly... - Used a record to do the "Math" learn.java/learning/tut... - Added a method to clean my data and remove the spaces. Certain there's an easier way, but then you couldn't talk about clean data! github.com/clfurman/Adv...

Creating and Using Records - Learn.java

Creating and using records

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 10/12/2025

To support you completing the Advent of Code, here are some 2D array tutorials. - Intro to 2D Arrays: learn.java/learning/tut... - Iterating Over 2D Arrays: learn.java/learning/tut... Practice sets to come! Enjoy!

Introduction to Two-Dimensional Arrays - Learn.java

Learn how to create two-dimensional arrays to store data

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Reposted by Crystal Sheldon

José Paumard @josepaumard.bsky.social · 06/12/2025

A bunch of resources for beginners and also not so much beginners, I gladly recommend! 👏👏👏

Crystal Sheldon @crystal-l-sheldon.bsky.social · 05/12/2025

What's new on Learn.java this week? Motivated by doing Advent of Code and looking for ways to support solutions, I've added the following tutorials this week. - Reading from a text file - Intro to Arrays - Iterating over Arrays - Using Split on Arrays

Learn.java: The Destination for Java Beginners, Students, and Teachers

Crystal Sheldon @crystal-l-sheldon.bsky.social · 03/12/2025

Advent of Code Day 2... Seemed really easy, until bullet 3! LOL. - Added a record to return endSpot and a zeroCount - Modified my easy mod solution to use a while loop. - Realized I was double counting if I went negative but also started at zero. github.com/clfurman/Adv...

GitHub - clfurman/Advent-of-Code-2025: Java solutions for the advent of code.

Java solutions for the advent of code. . Contribute to clfurman/Advent-of-Code-2025 development by creating an account on GitHub.

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 02/12/2025

Reading data from a file in a new topic in the #APCSA. Don't wait until ArrayLists to start File reading, students only need to understand method calling and while loops! Check out the tutorial here: learn.java/learning/tut... Then try Day 1 of the Advent of Code!

Reading from a Text File using File and Scanner - Learn.java

Reading data from a text file using the File and Scanner classes.

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 02/12/2025

Advent of Code - Did you get a Day 1 Star? - file reading in the AP CSA style (for better or worse). - records to capture the rotation as a String and a number! - void main() and IO class - Please don't judge how I dealt with the negative numbers :) github.com/clfurman/Adv...

GitHub - clfurman/Advent-of-Code-2025: Java solutions for the advent of code.

Java solutions for the advent of code. . Contribute to clfurman/Advent-of-Code-2025 development by creating an account on GitHub.

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 01/12/2025

The recording of the Java Card Game Challenge: Shuffle the Deck webinar has been posted. Check it out here: youtu.be/catdtD1fyvw Our final webinar of this series on Card Visuals with Text Blocks is this Wed Dec 3 at 3pm. Register here: oracle.zoom.us/webinar/regi...

Java Card Game Challenge 5: Shuffling the Deck

YouTube video by Java

Crystal Sheldon @crystal-l-sheldon.bsky.social · 25/11/2025

This short week on Learn.java!!! Some new Practice for Nested Loops: - Evaluating nested loops - Writing nested loops Some new videos have been added to these Learn pages: - Intro to determine a data type - Naming variables - Declaring and initializing variables

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 21/11/2025

Java Card Game Challenge #6 - Create visuals for your cards using text blocks. You could also get creative and do this using Java FX. Come learn all about how to format output with text blocks. When: Wednesday, December 3rd, at 3pm ET Register: lnkd.in/ehn_5czq

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 21/11/2025

What's new this week on Learn.java? - An #APCSA free response practice question for data analysis and ArrayList: learn.java/learning/les... - The last of our Java Card Game Challenges has been posted. Register for our webinar on Dec 3 at 3pm ET: learn.java/teachers/tea...

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 17/11/2025

New AP CSA FRQ #3 practice question was just posted. Check it out: learn.java/learning/les...

AP Computer Science A Free Response Practice - Data Analysis and ArrayList - Average Daily Sales - Learn.java

Practice writing code to complete a free response question 3 to analyze data in an ArrayList

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 17/11/2025

It's not too late to register for this week's webinar where we explore shuffling algorithms. When: 11/19/2025 at 3pm ET Register today: oracle.zoom.us/webinar/regi...

Video Conferencing, Web Conferencing, Webinars, Screen Sharing

Zoom is the leader in modern enterprise video communications, with an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems. Zoom ...

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 17/11/2025

I'm trying something new this year! Advent of Code. I've never participated before, but have heard such good things. Who's joining me? Starts December 1st! adventofcode.com

adventofcode.com

Advent of Code 2025

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 13/11/2025

What's new this week on Learn.java? - Two practice sets for ArrayList -- Reading code: lnkd.in/eKSbR_Tz -- Writing code: lnkd.in/ega68HnP

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 11/11/2025

Did you miss our webinar on creating our first card game? If so, watch the recording: www.youtube.com/watch?v=8qM3...

Our First Card Game

YouTube video by Java

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 10/11/2025

It was my privilege to meet with Oracle Interns and ask them about how they came to want to study CS, what their internship was like at Oracle, and to share what they are planning next. Here is their inspiring stories: www.youtube.com/watch?v=WcKi...

Meet the 2025 Oracle Interns

YouTube video by Java

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 10/11/2025

There is a lot of new material to discover on Learn.java. Check it out today! www.linkedin.com/pulse/novemb...

November Newsletter on Learn.java

Java Teaching Support on Learn.java Learn.

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 31/10/2025

What's new on Learn.java this week? - Two new #APCSA Class Design FRQs. See the full list: lnkd.in/eehyhtaN - Recording of Writing Methods webinar, check out our next challenge: lnkd.in/eayzV4rf - Tracing animations for if and comparing objects

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 30/10/2025

Do you struggle with explaining the difference between == and .equals in Java? We just added some tracing videos to Learn.java that might help! learn.java/learning/tut... #java #learnjava #teachjava #equalsmethod #comparingobjects

Learn.java: The Destination for Java Beginners, Students, and Teachers

Crystal Sheldon @crystal-l-sheldon.bsky.social · 30/10/2025

The Learn.java page has just added some code tracing videos for if statements. Check them out: learn.java/learning/tut... More to come soon!

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 29/10/2025

If you missed last week's webinar on Writing Methods, you can watch the recording here: www.youtube.com/watch?v=Bx4Z... #cardgamechallenge #learnjava #teachjava

Writing Methods

YouTube video by Java

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 28/10/2025

A new #APCSA FRQ 2, Creating Classes practice question has been posted. Check it and all our AP CSA practice FRQs out here: learn.java/teachers/apc... #learnjava #teachjava #apcsaexampractice

AP Computer Science A Teachers - Learn.java

Resources for AP CSA Teachers.

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 23/10/2025

We just posted our next challenge to write our first card game. Need help? Register for our free Java webinar! When: November 5th at 3pm ET Registration Link: oracle.zoom.us/webinar/regi... #learnjava #teachjava #java

Crystal Sheldon @crystal-l-sheldon.bsky.social · 23/10/2025

Join us for our next coding challenge!! We have been building a Card game and have created a deck of cards that we can deal to players. In this next challenge, we will be creating our first game. Check out the challenge here: learn.java/teachers/tea... #learnjava #teachjava #java

Our First Card Game - Learn.java

Use the Card game code we have been writing to create our first card game.

Reposted by Crystal Sheldon

Crystal Sheldon @crystal-l-sheldon.bsky.social · 09/10/2025

Card game challenge continues with dealing cards to players. Check out the challenge here: learn.java/teachers/tea... Then register for our Free Webinar. October 22, 2025 at 3pm ET Registration link: oracle.zoom.us/webinar/regi... #Learnjava #teachjava #java

Crystal Sheldon @crystal-l-sheldon.bsky.social · 17/10/2025

We just added a new #APCSA Free Response question that involves if statements and for loops. Great for early free response practice. This makes 4 free response practice questions. I've also added alignment to AP standards. learn.java/learning/les...

AP Computer Science A Free Response Practice Using For Loops - Learn.java

Practice writing code that uses if statements and for loops.

Crystal Sheldon @crystal-l-sheldon.bsky.social · 16/10/2025

What's new on Learn.java this week? - Added a new culminating lab: Card Game. Currently we only have the first activity written which has you successfully creating a deck of cards using enum, records, and classes. - Added a new Learn tutorial on ArrayList

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 15/10/2025

Register today for our Free webinar on Writing Methods! We will continue to build on our Deck of Cards program by writing methods to deal cards. October 22, 2025 at 3pm ET Register here: oracle.zoom.us/webinar/regi...

Video Conferencing, Web Conferencing, Webinars, Screen Sharing

Zoom is the leader in modern enterprise video communications, with an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems. Zoom ...

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 14/10/2025

If you missed our webinar, "All About enum", you can watch the recording below. In this webinar, learn more about the power of `enum` as we improve our Deck of Cards program. www.youtube.com/watch?v=fvWt... #learnjava #teachjava #java #enum

All About `enum`

YouTube video by Java

Crystal Sheldon @crystal-l-sheldon.bsky.social · 13/10/2025

Grateful to have been included in the latest issue of HelloWorld. This issue features programming languages. In my article, I highlight how Java has become easier for new learners. Check it out. www.raspberrypi.org/hello-world/...

raspberrypi.org

Issue 28 | Hello World | Raspberry Pi Foundation

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 10/10/2025

What's new on Learn.java this week? Not a lot of new content, but we have been conducting a read through and making improvements across the tutorials. A new tutorial that has been added: - enum Constructors and Methods learn.java #learnjava #teachjava

Learn.java: The Destination for Java Beginners, Students, and Teachers

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Crystal Sheldon @crystal-l-sheldon.bsky.social · 09/10/2025

Card game challenge continues with dealing cards to players. Check out the challenge here: learn.java/teachers/tea... Then register for our Free Webinar. October 22, 2025 at 3pm ET Registration link: oracle.zoom.us/webinar/regi... #Learnjava #teachjava #java

Crystal Sheldon @crystal-l-sheldon.bsky.social · 07/10/2025

Not to Late to Register for our Free #Java Webinar!! When: 10/8/2025 at 3pm ET Register here: oracle.zoom.us/webinar/regi...

Crystal Sheldon @crystal-l-sheldon.bsky.social · 02/10/2025

What's new on Learn.java this week: - Loop practice: while, do..while, for - New #APCSA FRQ on while loops and if statements - New videos on pattern matching - Video on What's New in Java 25? #learnjava #teachjava #java #java25

Learn.java: The Destination for Java Beginners, Students, and Teachers

Crystal Sheldon @crystal-l-sheldon.bsky.social · 02/10/2025

Looking for an online Java IDE that is running Java 25? Have you look at pickcode.io? Check it out!

Pickcode: The online IDE for your classroom

Pickcode's online coding platform is the easiest way to run your CS classroom. Collaborate on code, create custom lessons, and monitor student progress on our Classroom plan.

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