Instance Variable - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  26.4K views 108 likes 10 dislikes   23 Feb 2015
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You've just practiced with Sara how to find the public interface of another
Acaban de practicar con Sara la manera de encontrar la interfaz pública de otra
class, now let's go back to our car class. We had discovered the public
clase, ahora volvamos a nuestra clase Coche. Habíamos descubierto la interfaz pública
interface that you see over here and now our goal is to implement it. So
que ven por aquí y nuestra meta ahora es implementarla. Bien,
imagine a car object and let's have a look at the add gas method. We're adding
imaginen un objeto coche y echemos un vistazo al método «addGas» Estamos añadiendo
a certain amount of gas and what should that do to the car. Well, remember,
una cierta cantidad de gasolina y lo que eso debe hacer al coche. Bueno, recuerden
it's not a real car and it's not real gas. This car is just an object in a
que no es un coche real y no es gasolina real. Este coche es sólo un objeto en una
computer, and it remembers some information. In particular, in order to add
computadora que recuerda cierta información. En particular, con el fin de añadir
gas, the car needs to remember how much gas it has. In Java, you use variables
gasolina, el coche tiene que recordar la cantidad de gasolina que tiene. En Java, se utilizan variables
to remember anything. And here's is how you write such a variable, a variable
para recordar cualquier cosa. Y está es la forma de escribir tal variable, una variable
has a name just like the variables that you've seen in the previous lesson as
tiene un nombre igual que las variables que han visto en la lección anterior así como
well as a type. And then there is this key word private here that simply means
un tipo. Y luego tenemos esta palabra clave «private» (privado) que simplemente significa
that the variables of an object are a part of the private implementation. The
que las variables de un objeto son parte de la implementación privada. El
programmer who uses the public interface doesn't need to know about that. You
programador que utiliza la interfaz pública no necesita saber eso. Siempre
will always want to declare instance variables as private. Let me tell you why
querrán declarar como privadas las variables de las instancias. Les voy a decir por qué
they're called instance variables. Let's have a look at another car object, or
se denominan variables de instancia. Vamos a echar un vistazo a otro objeto coche, o
as we say, another instance of the car class. Of course, it also needs to
como decimos, otra instancia de la clase Coche Por supuesto, también necesita
remember how much gas it has. And the amount of gas that this object has will
recordar cuanta gasolina tiene. Y la cantidad de gas que este objeto tiene
be different from the amount of gas of the other object. So each of these
será diferente de la cantidad de gasolina del otro objeto. Así que cada uno de estos
objects, or each of these instances of the car class needs to have its own
objetos, o de cada una de estas instancias de la clase Coche tiene que tener su propia
variable to store that information. That's what it means to be an instance
variable para almacenar esa información. Eso es lo que significa ser una variable
variable. It's a variable that occurs in every instance of the class. Now
de instancia. Es una variable que se produce en todas las instancias de la clase. Ahora
there's another thing that each car object should remember, namely its mileage.
hay otra cosa que cada objeto coche debe recordar, es decir, su kilometraje.
Here's how you can define the variable, we give it a name, miles driven. It's
Esta es lo forma en la que pueden definir la variable,le damos un nombre, «milesDriven» (millasConducidas). Su
type, it's again a number. And once again, each instance of the car class has
tipo, es de nuevo un número. Y una vez más, cada instancia de la clase Coche tiene
its own value, so it needs its own copy of that variable. These are the two
su propio valor, por lo que necesita su propia copia de esa variable. Estas son las dos
instance variables that we need for the car class. You will soon see how the
variables de instancia que necesitamos para la clase Coche. Pronto verán como los
methods of the car class update or read those instance variables. But first, go
métodos de la clase Coche se actualizan o leen esas variables de instancia. Pero primero, continúen
ahead and practice with Sarah how to discover the instance variables that we
y practiquen con Sara cómo descubrir las variables de instancia que
need for the person class.
necesitamos para la clase Persona.
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