SUN 311-019 : Sun Certified Associate for Java 2 Platform, Standard Edition Exam
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Exam Number : 311-019
Exam Name : Sun Certified Associate for Java 2 Platform, Standard Edition
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SUN Java test
Let’s birth right off with a controversial declare: Forth is the hacker’s programming language. Coding in Forth is a bit bit like writing assembly language, interactively, for an odd CPU architecture that doesn’t exist. Forth is a digital laptop, an interpreted command-line, and a compiler multi functional. And all of this is essential sufficient that it’s simply in a position to running in a few kilobytes of reminiscence. When your Forth code is appropriate, it reads just like a natural-language sentence however getting there includes somewhat of poser solving.
From pondering FORTH (PDF)
Forth is what you’d get if Python slept with assembly Language: interactive, expressive, and devoid of syntactical baggage, however still very close to the metallic. Is it a high-stage language or a low-level language? sure! Or rather, it’s the shortest route from one to the different. which you could, and should, peek and poke directly into memory in Forth, however that you could also build up a physique of larger-stage code quick satisfactory that you gained’t mind. personally, this aggregate of live coding and proximity to the hardware makes Forth remarkable for exploring new microcontrollers or working them into your initiatives. It’s a enjoyable language to write down a hardware abstraction layer in.
however Forth is also like a high-wire act; if C gives you enough rope to grasp yourself, Forth is a flamethrower crawling with cobras. There is no classification checking, no scope, and no separation of information and code. which you can do horrible issues like redefine 2 as a function with a view to return seven, and perpetually after your math gained’t work. (however why would you?) which you could quite simply leap off into unhealthy sections of reminiscence and crash the system. you're going to develop a very good intellectual mannequin of what records is on the stack at any given time, otherwise you will endure. if you want a compiler to fret about code safety for you, go see Rust, Ada, or Java. you're going to no longer find it here. Forth is about simplicity and flexibility.
Being primary and flexible additionally ability being extensible. almost nothing is included with most Forth techniques by using default. in case you like object-oriented vogue programming, for instance, Gforth comes and not using a fewer than three diverse object frameworks, and also you get to select whichever fits your problem or your fashion choicest. that you may modify the Forth compiler or interpreter itself, so if you desire class checking, you could add it. Some Forth implementations are written with just twenty or thirty features in native assembly or C, and the rest is bootstrapped in Forth. quicker Forths are applied fully in meeting language, with some assemble-time optimizations that make it run about as speedy as anything else, even though it’s compiled as you type, on the target microcontroller itself.
Forth is probably not the language you want to study if you are designing an business banking backend. even so, a string of blinky LEDs operating a physics simulation isn’t an “enterprise” anything. Forth is a hacker’s language, in each the laudatory and the pejorative senses. I’m no longer bound that it’s going to help you get “actual work” achieved at all, and you engineer varieties might are looking to stroll away now. but if you need to tweak at the language itself, or use it to push your hardware round, or simply play, Forth is astounding. The hacker in me thinks that’s a lot of enjoyable, and it’s a fine match for smaller microcontroller initiatives.
Forth Crash course: thought area
Forth is the least difficult language after meeting language. Forth is procedural within the severe — a Forth program is in fact just a series of subroutines, called “phrases” within the Forth jargon. There’s no syntax, and all phrases are separated by using an area and are parsed left to appropriate. With just a few exceptions for compiling, all words run at this time so the Forth interpreter doesn’t need to seem ahead to the subsequent observe. run this code! is valid Forth in case you’ve already defined the phrases run, this, and code! and it calls each and every of the three phrases within the order that you simply’d are expecting.
Simplicity and Reverse Polish Notation
The corollary of this elementary setup is that Forth uses the so-known as Reverse Polish Notation (RPN). If the Forth interpreter goes to execute the + be aware at the moment, it has to have both numbers that are going to get brought already on the stack. in any other case, it could ought to stay up for the subsequent quantity to come back along before it may conclude the addition. study that once more, and let it sink in. It’s distinct from what you’re used to, and it’s essential.
every other ordering or syntax is unnecessarily complicated. the way that you just consider of as “herbal” to write down down math is crazy, within the sense that the seem to be-ahead nature of the + operator requires both parentheses or an “order of operations” to be unambiguous. study 2 + 3 * 4. there is nothing natural about getting 14 here in any respect — it’s the effect of a convoluted syntax with implicit guidelines. You have to examine the total “sentence” first, discover the *, bear in mind that it has priority over +, evaluate it first, and then go again to the addition to finish up, however + is the 2nd note within the sentence. a pc doesn’t are looking to learn about “order of operations”, it just needs to add two numbers, preferably ones which are already sitting in ALU registers. Don’t agree with me? study the computer code.
Forth, and RPN, write this as 2 three four * + or 3 four * 2 +. both way, the operator works on whatever numbers are already obtainable. in case you don’t feel of this as being “reverse” or “polish” or perhaps a “notation”, you’ll be on the correct track. You’re simply writing things down in the order wherein they may still be completed. (How crazy is that!?!)
i love to consider of RPN because the computing equivalent of mis en location; before you start cooking, you get all of your elements lined up. here is the way Forth code works: get.broccoli chop.broccoli get.beef slice.red meat get.oyster-sauce stir.fry Some aspects are naturally interchangeable — you may get and slice the pork earlier than the broccoli — however the average order is vital to the system, and also you actually don’t need to be going returned to slice the broccoli whereas the pork is in the wok. but here is exactly what you’re doing if you insist on writing 3 + 4 in its place of three four +.
Compiling and working
New phrases are defined and compiled with a : to enter compilation mode and a ; to exit. Compilation, such as it is, takes location instantly. under the hood, the Forth interpreter is asking up every be aware that you simply use within the definition and simply stringing them together. One exception to this rule is the feature name itself, as you’ll see now.
compile your first Forth word: : seven three 4 + ;. It’s now not very valuable, however it creates a be aware called seven with the intention to put a 3 and a 4 on the stack after which run the addition note. The “influence” is that something you had on the stack before, you’ll have a 7 on appropriate of it now. An optimizing Forth compiler will just push a 7 onto the stack.
All programming is set breaking complex projects down into cost effective-sized chunks. What constitutes “within your means” relies upon a little bit on the language, just a little on the programmer’s own fashion, and somewhat on the cultural zeitgeist. Executing a note in Forth requires lots much less overhead than a feature call in C, and following long code logics can get convoluted even for experienced Forthers, so the definition of Forth words are typically extraordinarily brief, typically one-liners together with feedback. You’ll be compiling reasonably commonly.
The heart and soul of Forth is the information stack, henceforth “the stack”. Forth is a stack-primarily based language, and until you’ve coded in Forth for ages, that you can’t respect what this truly skill and the way concepts about the stack come to dominate your coding lifestyles. Forth words don’t take arguments or return values, in its place they operate on something facts is on the stack when they’re referred to as.
The stack is the most excellent and worst part of Forth. When your stack contents line up correct with the words that operate on them, the result is code of a beauty and effectivity that can’t be beat. once they misalign, you end up questioning if the object-oriented folks aren’t right, and that coupling records with strategies might possibly be a good suggestion in any case.
The gimmick in Forth programming is figuring out what’s crucial on the stack through one observe, and making bound that the be aware used just beforehand leaves that on the stack. in this experience, the Forth programmer defines phrases, but needs to think in phrases, where the contents of the stack beginning out empty and end that means again. this is just like the means that C uses the stack within a function scope, conserving the native variables handiest except it’s accomplished with the function, after which overwriting them.
As a concrete illustration of this chaining, think about a note, gpio-set that units a GPIO pin high. it is going to doubtless need each a port and a pin quantity to get the job finished. a particularly Forthy way to implement here is to define a word for every pin on the part that you simply’re going to use: : PA3 PORTA three ; Then that you can gentle the LED on pin A3 with PA3 gpio-set. In C, you’d first define a constitution that includes a port and a pin quantity, then define gpio-set to take a structure of that classification. In Forth, here's implicit: you make certain that the pin words push a port and pin quantity onto the stack, and then that pin-dealing with phrases are expecting them. It’s not safe, nonetheless it’s fundamental.
Swap-swap, the Forth Mascot, from starting FORTH
The completely worst part of Forth is stack manipulations. people constantly start studying Forth through discovering about the stack manipulations, and indeed they are essential, but they’re trivial. words like swap, drop, and dup can help you circulation objects round on the stack, but too many “stack juggling” manipulations in a given note is doubtless an indication of unhealthy Forth code, as opposed to respectable. You’ll use these words for bound, but that’s now not the place the bodies are buried.
fairly, the stack is the place absolutely the minimal amount of records desires to take a seat between processing steps. The variety of items needs to be small sufficient to steer clear of running out of finite stack space, of course. however a second motive is that it’s effectively challenging to retain too many stack objects straight in your intellect. As you get used to Forth, the quantity of stack that you can internalize may go up from three gadgets to 5 or seven, but you’re going to get perplexed if you let the stack grow unpruned for lengthy.
So Forth is a disaster. It’s a language the place you must control the stack yourself, and the handiest hope of no longer getting caught in a tangled internet of countless stack juggling is to keep things so simple as possible. Forth proponents would declare that here is additionally its ideal virtue — there’s always drive to keep issues basic and simple as a result of doing anything will embed un-figure-outable bugs so deep into your code that you’ll go mad. I don’t be aware of if it’s Stockholm syndrome, whether I’m a minimalist at coronary heart, or whether i admire the challenge, but here's actually one of the most causes that Forth is so neat.
other programming languages permit you to juggle tens of variables since the compiler continues track of distinct scopes for you, retaining song of how deep every (local) variable is on the stack. Forth doesn’t. And that skill that you should believe in regards to the order during which issues run. Forth forces you to internalize slightly of optimization that a fantastic compiler would do for you. this may emerge as in very tight code, or in headaches. It depends upon the programmer and the difficulty.
In my journey, simple syntax, computing device-friendly ordering, and the resulting emphasis on transparency and ease make it really incredibly effortless to get stuff right in Forth.
The candy Spot
but enough philosophical crap about Forth. if you desire that, which you could read it in different places in copious quantities. (See the thesaurus under.) There are three motives that Forth extra unique to the hardware hacker at this time than ever before. the primary rationale is that Forth changed into developed for the computer systems of the late 1970s and early 1980s, and this level of energy and sophistication is very nearly what you discover in each $three microcontroller available on the market presently. The other two explanations are intertwined, but revolve around one particular Forth implementation.
There are 1,000,000 Forths, and every one is a distinct snowflake. We’ve lined Forth for the AVRs, Forth on palms, and most currently Forth on an ESP8266. The joke goes that in case you’ve viewed one Forth implementation, you’ve seen one Forth implementation. however I believe that’s too cynical — Forth is as an awful lot a means of considering about the desktop programming difficulty because it is a selected implementation. when you gain knowledge of one, you’ll be on respectable footing to be trained any other.
Anyway, just a few years in the past, a physics graduate scholar [Matthias Koch] wrote a Forth for the MSP430 because he necessary a microcontroller to bring together analog information for an experiment. That’s “Mecrisp”. afterward, he necessary extra velocity and re-wrote it for the ARM Cortex M household of chips, and they acquired “Mecrisp-Stellaris“.
And that’s the place things acquired outstanding. [Jean-Claude Wippler], the “J” in JeeLabs, decided that he become going to put in force his new system of distributed electrical and environmental sensors in Forth, at the least beneath the hood. To do that, he obligatory a hardware abstraction layer. The mixture of Mecrisp-Stellaris with the JeeLabs libraries is an immense Forth ecosystem for an entire bunch of ARM microcontrollers, and it has all been developed inside the ultimate two years by using a small core of thoughtful hackers. Combining the two gives a extremely gratifying Forth microcontroller hacking adventure, like a peculiar interactive Arduino.
So in case you need to observe alongside down a very ordinary rabbit gap, study a bit in regards to the true hacker’s programming language, or simply idiot around, reside tuned. In a couple of weeks, I’ll put up a palms-on book to getting begun with Mecrisp-Stellaris on the STM32 family ARM chips.
These are the droids you’re hunting for.
a pretty good minimum Mecrisp-Stellaris building ambiance goes to include an affordable STM32F103 development board, a ST-hyperlink v2 (or more desirable) programmer for it, and a USB-TTL serial adapter. chances are first rate that you’ve received at least the latter kicking round already. in that case, you could be set up with the rest for round $10, €10, or £10 counting on where you are living. “STM32F103” and “ST-hyperlink” should get you installation on eBay.
So order some elements right now. whilst you’re looking forward to delivery, work through this very respectable online tutorial. Run via that, and also you’ll be set for subsequent time.
if you wish to go additional, that you could down load a Forth to your desktop computing device and start working via every other introductions. Brodie’s “starting FORTH” is the canonical Forth introduction, nonetheless it’s slightly dated (and suppose free to pass Chapter three on disk entry). in case you prefer brevity over humor, take a look at J.V. Noble’s beginner’s ebook or the Gforth tutorial.
All photos from beginning FORTH used through permission from FORTH, Inc. The originals are black and white, instead of Hackaday darkish charcoal and yellow, naturally.