Start learning with our library of video tutorials taught by experts. Get started

Code Clinic: Java
Illustration by Don Barnett

Code Clinic: Java

with Patrick Royal

Video: Recursion and Directories

(theme chords sound) - Hello and welcome to Code Clinic. My name is Patrick Royal. Code Clinic is a monthly course where a unique problem is introduced to a collection of lynda.com authors. In response, each author will create a solution using their programming language of choice. You can learn several things from Code Clinic: different approaches to solving a problem, the pros and cons of different languages, and some tips and tricks to incorporate into your own coding practices. This month, the problem combines two concepts: recursion and accessing image data.

Watch this entire course now —plus get access to every course in the library. Each course includes high-quality videos taught by expert instructors.

Become a member
please wait ...
Watch the Online Video Course Code Clinic: Java
1h 19m Intermediate Jul 15, 2014 Updated Nov 18, 2014

Viewers: in countries Watching now:

Many successful programmers know more than just a computer language. They also know how to think about solving problems. They use "computational thinking": breaking a problem down into segments that lend themselves to technical solutions. Code Clinic is a series of six courses where lynda.com authors solve the same problems using different programming languages. Here, Patrick Royal works with Java.

Each month, Patrick will introduce a new challenge and provide an overview of his solution in Java, explaining how he broke the problem up into logical components, and revealing the difficulties he encountered. Challenges will include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.

Visit other courses in the series to see how to solve the exact same challenge in languages like C#, C++, PHP, Python, and Ruby. And check back every month for new challenges.

Subjects:
Developer Programming Languages
Software:
Java
Author:
Patrick Royal

Recursion and Directories

(theme chords sound) - Hello and welcome to Code Clinic. My name is Patrick Royal. Code Clinic is a monthly course where a unique problem is introduced to a collection of lynda.com authors. In response, each author will create a solution using their programming language of choice. You can learn several things from Code Clinic: different approaches to solving a problem, the pros and cons of different languages, and some tips and tricks to incorporate into your own coding practices. This month, the problem combines two concepts: recursion and accessing image data.

Recursion means to repeat something in a similar way. In programming, recursion means that a function will actually call itself, nesting a call to a subroutine, within the call to the same subroutine. Look for this in the code samples you're about to see from the authors. .JPEG files can contain image data stored as EXIF or IPTC. EXIF stands for Exchangeable Image File format, and is a well-documented standard. If you have a digital camera, or have taken photos with a newer cell phone camera, the image probably has EXIF data available.

Using a Macintosh? You can see this metadata information by opening the image in "Preview", opening "Tools", and then "Show Inspector", and selecting the "EXIF" or "IPTC" tab. On Windows, you can see the metadata by right clicking on the image, then selecting "Properties", and the "Details" tab. You'll see things like "Caption", "Dimensions", "Camera Type", "Color Space", exposure information, and other details. Cell phones will also imbed geographic location data, identifying the longitude and latitude. The challenge is to look through the example files included with Code Clinic, find images, extract the caching from the metadata, and then reorganize these photos into an alphabetical folder structure, based on the caption.

As always, you may wanna take some time, and solve the problem yourself. In the next videos, I'll show you how I solved this challenge.

There are currently no FAQs about Code Clinic: Java.

 
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ .

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed Code Clinic: Java.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member ?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferences from the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Learn more, save more. Upgrade today!

Get our Annual Premium Membership at our best savings yet.

Upgrade to our Annual Premium Membership today and get even more value from your lynda.com subscription:

“In a way, I feel like you are rooting for me. Like you are really invested in my experience, and want me to get as much out of these courses as possible this is the best place to start on your journey to learning new material.”— Nadine H.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.