Proceso de compilación de un archivo bytecode en JAVA y explicación de los sistemas numéricos

¿Que es el sistema binario?

El sistema binario se podría definir como el único lenguaje que entiende una computadora. Esté sistema, está compuesto por dos niveles de voltajes diferentes 1 y 0 que van cambiando y representa la manera de poder mandar un conjunto de instrucciones (u ordenes) a dicho dispositivo. Como solo tenemos 1 o 0 (podemos decir que binario es base 2).

El 0 representa apagado y el 1 encendido y a través de la combinación de estos diferentes voltajes el ordenador interpreta las órdenes. Por ejemplo, la representación de 8822 en binario sería 0010001001110110.

A modo de curiosidad, la calculadora de Windows, en modo Programador, nos permite transformar un número de cualquiera de los formatos que aparecen en la calculadora a binario u a otros sistemas como son: el Hexadécimal, Octogonal, Binario o Decimal.

¿Que formato tiene un Bytecode?

Cuando escribimos un programa en JAVA, afortunadamente para nosotros, no utilizamos ceros y unos. Y por lo tanto tenemos que hacer una traducción de por ejemplo nuestro primer programa Hola Mundo. Ese código en lenguaje de programación en este caso Java lo debemos compilar.

La compilación sería muy similar a dos personas que hablan diferentes idiomas, uno Inglés y otro Castellano, el proceso de traducción entre ambos lenguajes se conoce como COMPILACIÓN. En este caso dicha compilación genera un archivo BYTECODE (que es el código intermedio entre el ingles y el castellano conocido en la informática como lenguaje ensamblador, en este caso dicho lenguaje será el bytecode esté archivo lo leerá nuestra máquina virtual de JAVA= JVM, y lo convertirá en un formato binario pasando así, las instrucciones que tendrá que ejecutar el dispositivo.

Por lo tanto, el proceso de compilación en JAVA, compila un programa en .java , está compilación, crea un archivo BYTECODE (llamado HolaMundo y con terminación .class) que al interpretarse por la JVM Java Virtual Machine le dará las ordenes en forma binaria 01010101110 y el equipo ejecutará las instrucciones pertinentes.

Bien vamos ha hablar profundizar un poco más sobre el formato del archivo bytecodes. El archivo bytecode, está en lenguaje que la máquina virtual de Java puede leer. Hay que destacar que dicho lenguaje no es binario sino emsamblador un paso más arriba y será la JVM la que se encargará de transformar el bytecode a un lenguaje binario.

Creamos por ejemplo un HolaMundo.java y hacemos un javac o lo compilamos (al final viene a ser lo mismo). El archivo que se generará será un HolaMundo.class que si lo ejecutamos aparecerá un Hola Mundo por consola. El archivo en formato generado HolaMundo.class, está en un formato podemos decir que dicho archivo es un archivo intermedio que está en tierra de nadie, en la frontera (o como lo queráis llamar) entre el lenguaje Java y lenguaje máquina.

Bien sigamos el lenguaje “ensamblador”, no es nada más y nada menos que lenguaje de bajo nivel que manda unas instrucciones (ordenes) básicas al computadores, procesadores, etc. El lenguaje ensamblador tiene por debajo solamente lenguaje máquina (o binario 010011). En este caso, podemos decir que el dicho lenguaje en Java y concretamente para la JVM (Java Virtual Machine) es el Bytecode que está en ensamblador y está en un formato Hexadecimal.

Este bytecode será ejecutado por la JVM y lo pasará por fin a lenguaje binario para explicarle así lo que la computadora (o el dispositivo que sea) ejecute unas instrucciones (ordenes).

Formato hexadecimal del archivo bytecode de Java

Bytecode se bautizó por ese nombre, debido a la longitud de cada una de sus operaciones un byte (= 8 bits). Si elevamos el número de bits a base 2 –> 2^8(por el número total de bits que contiene un byte) nos dará como resultado el número 255 (el valor máximo que puede contener un byte EN DECIMAL). Por lo tanto, cada instrucción del bytecode tendrá un rango del 0 al 255.



El sistema Hexadecimal (base 16) está representado en sus 9 primeros dígitos en numeración decimal,  representando por las letras del alfabeto del A a las F (del número 10 al 15).

Bien vamos a explicarlo un poco mejor, un byte esta compuesto por 8 bits (byte = 8bits) y un dígito en hexadecimal representa (4bits) por lo tanto (4bits+4bits=8bits = 1 byte). En valor binario la representación sería desde 00000000 a 11111111 y en hexadecimal en cambio de 00 a FF.

Si abrimos el HolaMundo.class de la clase anterior nos encontraremos lo siguiente:

Normalmente todo en una sola línea, pero he ido pulsando ENTER para que lo veáis mejor, aunque la verdad, no hay mucho que ver. Ya que no se entiende nada. Esto es debido a que el NOTEPAD de windows no lee hexadecimal.



Por lo tanto bajaremos el HxD Hex Editor (aquí tenéis la web) un software especial para ello (aunque con que veáis la foto lo entenderéis perfectamente):

Valor cafebabe

Como excepción nos encontramos los cuatro primeros bloques de cualquier programa que siempre serán: CA FE BA BE.

Y su significado si lo transformamos a decimal sería

(CAFEBABE)16 = (3405691582)10

Cafebabe, Cafedead la historia completa

El nombre proviene de un lugar donde Gosling y compañía (los desarrolladores del lenguaje), solían tomar café conocido como St Michael’s Alley. Al cerrarse la cafetería, se convirtió en un santuario budista. Al que bautizaron como CAFEDEAD. Y un día, medio bromeando comprobaron que estaba en formado hexadecimal. Y tras una inspiración repentina James Gosling, convirtió CAFEBABE en el formato de archivo de una clase y CAFEDEAD en el formato de objeto persistente. Alfinal, el formato persistente de un objeto (CAFE DEAD) se substituyo por RMI, pero aún podemos ver el mítico CAFE BABE en nuestro código. 🙂

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    Talk With Web Visitor is a software widget that’s works on your site, ready to capture any visitor’s Name, Email address and Phone Number. You’ll know immediately they’re interested and you can call them directly to TALK with them – literally while they’re still on the web looking at your site.

    CLICK HERE http://talkwithcustomer.com to try out a Live Demo with Talk With Web Visitor now to see exactly how it works and even give it a try… it could be huge for your business.

    Plus, now that you’ve got that phone number, with our new SMS Text With Lead feature, you can automatically start a text (SMS) conversation pronto… which is so powerful, because connecting with someone within the first 5 minutes is 100 times more effective than waiting 30 minutes or more later.

    The new text messaging feature lets you follow up regularly with new offers, content links, even just follow up notes to build a relationship.

    Everything I’ve just described is extremely simple to implement, cost-effective, and profitable.

    CLICK HERE http://talkwithcustomer.com to discover what Talk With Web Visitor can do for your business, potentially converting up to 100X more eyeballs into leads today!

    Eric
    PS: Talk With Web Visitor offers a FREE 14 days trial – and it even includes International Long Distance Calling.
    You have customers waiting to talk with you right now… don’t keep them waiting.
    CLICK HERE http://talkwithcustomer.com to try Talk With Web Visitor now.

    If you’d like to unsubscribe click here http://talkwithcustomer.com/unsubscribe.aspx?d=javadesde0.com

  91. Hi,

    I want to contribute high-quality content to your website in form of a guest post through a simple 3 step process.

    1. I will send three amazing topic ideas that are up to the trend and your readers’ interest
    2. You need to choose one topic out of those.
    3. I will then send a high-quality, plagiarism-free article on that topic.

    You will just have to publish it with one do-follow backlink to my website. It will be a win-win.

    Please let me know if we shall start with step 1?

    Best,

    McKenzie Wilson

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