I do most of my large scale software development in Java and all of my scripting in Ruby. Its a wonderful combination that keeps me happy and productive.
Mentioning Ruby is greeted by most other developers with smiling nods of approval - its young, trendy and easy to love - however, mentioning that I use Java as my main language gets very mixed reactions. Everything from pointing and laughing to a direct punch to the face is possible. Ok, maybe not a direct punch, but at least a girlish slap or a really mean insult.
Unfortunately, explaining what I love about Java can't be done in a single sentence or two as a quick response to "Your language sucks!". It takes vast amounts of time and will often require me to peel away layers upon layers of prejudice. Since I am by nature a very lazy person I have decided to write this post so I can simply direct people here in the future. I'm sure that the number of Java hating people who will actually read this post will be very very close to zero, but thats an insignificant fact I can easily trick myself into forgetting.
Lets first get the most common type of prejudice I encounter as a Java developer out of the way. No, Java is not the only programming language I know and yes I have developed plenty of larger projects in languages without garbage collection - even in C. In fact, let me take this opertunity to bore you with the long and dull tale of my background as a software developer.
I took my first steps as a software developer in the mid eighties with Logo on my dads Apple II. The fact that I could make that little turtle on the screen do anything I wanted was so incredibly alluring. Yes, I know it was just a little triangle on a low resolution monochrome screen, but I was not even ten at the time and had never seen a real turtle. To me the experience was as close to having my own little reptilian slave, as I could imagine.... see, this is the kind of power trip functional programming will bring forth in young minds!
A couple of years later I moved with my mom and sister to Saudi Arabia. We lived near a hospital where my mom worked. Several of her friends among the local doctors helped out teaching me and my sister english, math and physics. Two of them were very interested in computers and soon introduced me to BASIC on a ZX Spectrum and a lunchbox sized Sharp PC7000. This opened up a whole new world for me. Not only was basic a fun language to learn for an 11 year old boy, but I now had two enthusiastic intelligent programmers who would gladly spend their time sharing their knowledge. This was so addicting that I had to get my own computer programmable in Basic. I ended up getting a small Casio fx-785P calculator. Not only was it programmable in BASIC, but it also had a rudimentary assembler and came with a small booklet introducing me to the concepts of assembly programming.
After we returned to Denmark in the late eighties, I finally got my own full sized computer - an Amstrad CPC 6128 which let me move on to Pascal as my next language. The structure and encapsulation that Pascal brought to my programs allowed me to progress in the size and scope of my projects.
In 1991 I went to Canada for a year as an exchange student. Here I excitedly enrolled in the computer science class at the local high school and was greatly dissapointed when I completed the years worth of material in about two months without really learning anything new. Luckily, my teacher in this class was just as excited to actually have a student with a passion for programming that he gladly spent the rest of the year introducing me to C and C++.
Upon returning to Denmark, I sold my Amstrad and bought an Amiga 500 which would once again bring me back to assembly programming, this time on the far more elegant Motorola 68000 CPU. The early nineties was an amazing time to be a programmer on the Amiga in europe. I was no longer alone as an enthusiastic amateur programmer, but surrounded by other young people competing in demo competitions all over europe.
In 1995 I started studying for my masters degree in computer science at a danish university (I never actually completed my masters.. I think I am still lacking about half a semesters worth of non cs related course work). I never really felt that the actual courses at the university gave me that much, but the vast amounts of information and topics that it introduced me to moved me further as a programmer than anything else had in the previous ten years. I started learning new languages as a hobby and soon developed a serious crush on the simplicity of the Forth core, the object oriented beauty of Smalltalk and the strangely different Prolog. Unfortunately, none of these easily lovable languages were able to keep up with all of my needs. So I stayed faithfull to C++.
By the end of 1995 I discovered Java. It was slow as hell, but strangely appealing. I started out using it purely for applets, which brought back a lot of the excitement of the demo scene on the Amiga. I even created a small applet (yeah, I know, that thing looks ridiculous today, especially since I didn't time sync it) for the Java intro competition at The Party in 1997. I was having more fun programming than I had had in a long time. I was still trying out new languages continouesly, but I never really found anything that was a much fun as Java at the time.
As time passed, so did the speed of Java and the size of its bundled API. If Sun hadn't kept focus on improving the Java platform, I'm sure I would have left it many years ago, but somehow it kept feeling like the development of the Java platform was keeping pace with my needs as a programmer. So it was only natural for me to keep using it as my primary language. Thats basically the story of how I ended up with Java as my primary language, which brings us to the actual point of this post. What it is that still makes me love Java today. There are four primary features that currently keep Java as my primary language.
A modern garbage collector
I have no problems writing well functioning code in languages without garbage collection or with manually assisted garbage collection such as pre-leopard Cocoa. However, with the fast well functioning garbage collector in Java, I feel like I am wasting my time whenever I handle these things manually in other languages.
A full featured consistent API
One of the things that finally made me drop PHP as a web development platform was the consistently inconsistent API. In Java the standard API is consistent enough that I can often guess how it works and how methods will be named.
Good performance
I don't necessarily need to be working in the fastest language/API combo possible, but performance is a factor for most of the software I develop so it needs to be close enough to the top, that I can remain competitive.
A good security model
There seems to be a direct correlation between the size of my programmer-ego and the number of mistakes I assume I won't make. By choosing a language with a good security model I can spend less time worrying about the quality of my code and more time bragging about my coding skills.
Java satisfies these four demands quite well. But, honestly any language/API combo that would satisfy these demands just as well for my intended target platform would work for me. I have no religious attachments to Java, but the fact that it has evolved hand in hand with my needs over the past 11 years and kept my life as a programmer fun has kept it as my primary language.
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