Redcode » Java Programming

Bytebeat: Algorithmic Symphonies

royvanrijn — Wed, 07 Dec 2011 15:42:08 +0000

A couple of days ago I first encountered “bytebeat”. This is a new hype revolving algorithmic music and sounds. The basic idea is this:

main(t) { for(t=0;;t++) putchar( t * (((t>>12) | (t>>8) ) & ( 63 & (t>>4)))); }

This simple loop has one variable, t (time). And every iteration we use t to [...]

Great code is written twice (or more)

royvanrijn — Fri, 21 Oct 2011 19:46:13 +0000

The last couple of years more and more people have been moving towards Agile development. These techniques aren’t new, most we’re devised in the 80s or 90s. But finally these days programmers and (more importantly) business consultants, architects and clients have learned to love and embrace Agile development.

Evolving requirements

It [...]

Meet me at Devoxx 2011

royvanrijn — Fri, 05 Aug 2011 14:53:21 +0000

This year I’ll be presenting at Devoxx in Antwerp, Belgium. In my opinion it currently is the best Java conference in the world. It’ll be my first talk in English.

The titel of the talk is: What Shazam doesn’t want you to know.

During the talk I’ll be explaining how Shazam works and [...]

Android application #1

royvanrijn — Sun, 29 May 2011 17:22:14 +0000

This weekend I wrote my first Android application: Love or Hate

The idea behind the game is very simple. When you start it the application goes online and looks at the most recent tweets containing the following phrases:

“I love it when” “I hate it when”

The application now displays [...]

Crowdflow needs you!

royvanrijn — Sun, 01 May 2011 17:03:55 +0000

Crowdflow wants to have your iPhone data, to generate pretty heatmaps!

Why am I telling you this? Because they are using my backup-data-extractor code! See their most recent blog entry.

The images they produce look very good, much better then the KML file in Google Earth!

Be sure to help them soon, because [...]

iPhone locations on Google Maps with Javascript

royvanrijn — Tue, 26 Apr 2011 13:34:27 +0000

Wow, great news!

After my previous blogpost a lot of people mailed me about the usability of my ‘iPhone location data to Google Earth’ tool. It was a command-line tool, and you needed to have Java 6 installed. The main goal was to show how it is done in Java, for other developers.

When [...]

Reading iPhone GPS data from backup (with Java)

royvanrijn — Thu, 21 Apr 2011 00:06:24 +0000

Today I noticed the following post on Slashdot: Apple Logging Locations of All iPhone Users

And the article they are referring to can be found here

First I was amazed, how can Apple do this? But on second thought, they aren’t sending it yet to anybody, it is just something on the phone [...]

Static state: Evil as well

royvanrijn — Tue, 19 Apr 2011 18:23:26 +0000

Today in our project we suddenly had 10 failing unit-tests on our integration server (Hudson). Opening Hudson and looking at the first failed build I was in for a surprise. The only code changed that commit was mine!

The scare

Quickly I looked around and went into overdrive mode:
I need to fix this [...]

Checked Exceptions: Evil

royvanrijn — Tue, 19 Apr 2011 17:13:55 +0000

Today somebody posted a comment:

‘Could you write a post giving more details on why you think
checked exceptions are “the embodiment of evil”?’

So here it is.

As you can see I haven’t written a post in a long time (sorry). This post is also not going to be [...]

De Bruijn sequence in constant amortized time

royvanrijn — Thu, 24 Feb 2011 21:29:29 +0000

Follow up on the previous blogpost.

Yesterday I wrote an algorithm in Java to generate de Bruijn sequences. But I had a breakthrough after reading:

K. Cattell, F. Ruskey, J. Sawada, M. Serra, C.R. Miers, Fast algorithms to generate necklaces, unlabeled necklaces, and irreducible polynomials over GF(2)

It has an algorithm which generates Lyndon words [...]