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These are the user uploaded subtitles that are being translated: 1 00:00:00,650 --> 00:00:04,010 In the last section, we started talking about the next application that we're going to be working on, 2 00:00:04,280 --> 00:00:08,900 this application is going to have a heavy focus on object oriented programming, particularly on the 3 00:00:08,900 --> 00:00:13,010 design aspect of how we set up the different classes inside of our application. 4 00:00:13,910 --> 00:00:18,770 So to that end, I put together a diagram that's going to help walk us through a design approach for 5 00:00:18,770 --> 00:00:20,210 designing our application. 6 00:00:20,960 --> 00:00:22,700 So here's the diagram on the screen right here. 7 00:00:22,910 --> 00:00:24,650 The diagram is a little bit confusing. 8 00:00:24,680 --> 00:00:27,200 We start off first at the top left hand box. 9 00:00:27,450 --> 00:00:32,330 Then we move over to the green one, to the right of that, and then we go down to the next row and 10 00:00:32,330 --> 00:00:32,750 so on. 11 00:00:33,570 --> 00:00:37,250 So inside this section, you and I are going to tackle this first row here. 12 00:00:37,820 --> 00:00:42,980 We're going to start off by thinking about the different types of things that exist inside of our application. 13 00:00:43,880 --> 00:00:49,670 And then we'll create a dart class to represent each of those things, then over time we'll start to 14 00:00:49,670 --> 00:00:53,470 add on fields and add on methods to those classes as well. 15 00:00:54,550 --> 00:00:58,780 Now, before we start walking through the design of this card's application, I just want to throw out 16 00:00:58,780 --> 00:01:04,300 the really quick that inside of any object oriented programming approach program, there's not necessarily 17 00:01:04,300 --> 00:01:06,310 one right way of doing things. 18 00:01:06,500 --> 00:01:11,500 There might be several different designs that are totally appropriate to use inside this application 19 00:01:11,710 --> 00:01:14,410 and throw out all the other apps that we're going to work on through this course. 20 00:01:15,070 --> 00:01:19,060 So if you come up with your own design that you think works better, that's totally fine. 21 00:01:19,120 --> 00:01:22,210 There's nothing to say that your design is right or my design is right. 22 00:01:22,250 --> 00:01:23,710 They're just different approaches. 23 00:01:24,520 --> 00:01:30,100 So with that in mind, let's think about some of the different types of things or classes essentially 24 00:01:30,250 --> 00:01:33,310 that exist inside of our card's application. 25 00:01:34,880 --> 00:01:39,470 Now, as I look at this diagram right here, I really see two separate things. 26 00:01:39,800 --> 00:01:44,450 I think the first kind of thing that we might want to model inside of our application would be very 27 00:01:44,450 --> 00:01:45,020 obvious. 28 00:01:45,020 --> 00:01:47,060 It might be an individual card. 29 00:01:47,690 --> 00:01:53,390 So we might have an individual card class that represents every single card inside of our application. 30 00:01:53,930 --> 00:01:58,640 But then the second thing that kind of exists here that's kind of a little bit harder to see is the 31 00:01:58,640 --> 00:02:03,140 overall collection of cards as well, or the overall deck of cards. 32 00:02:03,890 --> 00:02:06,140 A card by itself is kind of meaningless. 33 00:02:06,380 --> 00:02:10,539 A card by itself really just has a suit and a ring like the ace of diamonds. 34 00:02:10,970 --> 00:02:16,130 It's only when we take a collection of cards and assemble them together do we get some actual meaning 35 00:02:16,130 --> 00:02:17,060 out of our program. 36 00:02:17,720 --> 00:02:20,560 So in total, I think we have two separate things here. 37 00:02:20,990 --> 00:02:26,180 I think we have a deck class that's going to have some number of fields and methods tied to it. 38 00:02:26,630 --> 00:02:31,310 And I think we're also going to have a card class that's also going to have some number of fields and 39 00:02:31,310 --> 00:02:32,230 methods tied to it. 40 00:02:33,020 --> 00:02:36,020 So with that in mind, let's move on on a diagram. 41 00:02:37,380 --> 00:02:43,050 So the step two right here says that we're going to create a class to represent each type of thing that 42 00:02:43,050 --> 00:02:44,280 we're going to have inside of our app. 43 00:02:44,950 --> 00:02:46,500 So I'm going to flip back over to Arpad. 44 00:02:47,310 --> 00:02:49,570 I've still got a bunch of code here if you want to. 45 00:02:49,650 --> 00:02:53,510 You could certainly copy paste this over to some other file and save a reference to it. 46 00:02:53,730 --> 00:02:58,770 But for me, I'm just going to highlight all of it and delete it and then I'll create two separate classes. 47 00:02:59,610 --> 00:03:06,390 The first one is going to represent the deck of cards and then the second one will represent an individual 48 00:03:06,390 --> 00:03:07,560 card by itself. 49 00:03:08,340 --> 00:03:10,400 OK, so very humble beginnings here. 50 00:03:10,590 --> 00:03:16,100 Let's take a pause and we'll continue with step two of this flow right here inside the next section. 51 00:03:16,410 --> 00:03:18,450 So a quick break and I'll see you in just a minute. 5273

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