Drawing Pictures - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  5.1K views 8 likes 1 dislikes   23 Feb 2015
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To really understand objects and classes, it's best to work with lots of
Para entender realmente los objetos y las clases, lo mejor es trabajar con una gran cantidad de
examples. Let's try another example. And again, it's a great idea if you can do
ejemplos. Veamos otro ejemplo. Y de nuevo, es una gran idea si puedes hacerlo
this together with me. In BlueJ navigate to the pictures project in lesson two
junto conmigo. En BlueJ, navega al proyecto pictures (imágenes) en la lección dos,
and you will see here an icon representing a picture class. Let's make an
y usted verá aquí un icono que representa una clase Picture (Imagen). Vamos a hacer un
object of that class. Again, I will accept the default name, and here is my
objeto de esa clase. De nuevo, voy a aceptar el nombre predeterminado y aquí está mi
object. What can I do with it? Well you know how to find that out. You right
objeto. ¿Qué puedo hacer con él? Bueno, ya sabes que hacer para saberlo. Da clic
click on the object and you get a list of things that tell you the methods.
derecho en el objeto y obtienes una lista de cosas que te indican los métodos.
Let's pick a method and in fact we will pick the method called pick. This
Vamos a escoger un método y, de hecho, vamos a elegir el método llamado pick (elegir). Este
particular method opens up this file chooser here. That lists whatever image
método en particular abre este selector de archivo aquí que lista todos los archivos de
files happen to be available. You can also navigate to other folders but we'll
imágenes que puedan estar disponibles. También puedes navegar a otras carpetas pero vamos
just pick one here. Once you pick a file, a window pops up that shows the
sólo a elegir una aquí. Una vez que eliges un archivo, se abre una ventana que muestra la
image. Now let's see what else we can do. Let's call the pixels method. And it
imagen. Ahora vamos a ver qué más podemos hacer. Vamos a usar el método pixels (píxeles). Y
tells me that this particular image has 104,976 pixels. Okay, that's
me dice que esta imagen en particular tiene 104,976 píxeles. Bueno, eso es
potentially interesting. over here we have method called translate. Let's just
potencialmente interesante. Aquí tenemos el método llamado translate (trasladar). Vamos a
play with it to see what it does. It wants two numbers. I will just put in 100
jugar con él para ver lo que hace. Requiere dos números. Me limitaré a poner 100
and 200, click on OK. And now look carefully at the planet. as you see, it
y 200, y haré clic en Aceptar. Y ahora mira cuidadosamente el planeta; como ves,
moved. So the method is not called translate because it doesn't translate this
se movió. Así que el método no se llama translate porque puede traducir esto
into Lithuanian. Translation is a mathematical way of saying moving and it
al lituano. La traslación es una manera matemática de decir que se mueve, y
moved it by 100 pixels in this direction and 200 pixels in that direction. So
lo mueve 100 píxeles en esta dirección y 200 píxeles en esa dirección. Así que
this is another great example of an object. The object can do certain things.
este es otro gran ejemplo de un objeto. El objeto puede hacer ciertas cosas.
The methods tell you what it can do. In the next exercise you get to play with
Los métodos dicen lo que puede hacer. En el siguiente ejercicio vas a jugar con
objects of the picture class.
objetos de la clase Picture.
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