Creating the Project4:22 with Ben Deitch
In this video we'll start with a quick overview of solitaire, and then we'll create the project!
Before we get started with building the app, 0:00 let's make sure we're all on the same page about what Solitaire is and how it works. 0:02 Solitaire, also known as Patience or Klondike, 0:08 is a card game that you can play all by yourself. 0:11 Here's a quick overview of how we'll be playing. 0:14 We start by creating the tableau, which contains seven piles of cards. 0:17 The last card in each pile is placed face up, and 0:21 each pile has one more card than the last. 0:25 Once we've created the tableau, 0:28 the remaining cards are placed up here to become stock. 0:30 And when we want to draw a card, 0:33 we just flip it over into what's known as the waste pile. 0:35 But don't worry about throwing cards into the waste pile. 0:38 If we ever run out of cards in our stockpile, 0:41 we'll just recycle the waste to give us a new stock. 0:44 The goal of Solitaire is to move every card in the deck 0:47 up to these four foundations. 0:50 The catch is that each foundation corresponds to only one suit, and 0:53 you need to build up each foundation from the bottom starting with the ace. 0:57 There's also a catch when dealing with the tableau piles. 1:02 If we want to add a card to the tableau, its value needs to be 1:05 one lower than the card above it, and it also needs to be the opposite color. 1:09 So if we have a nine of hearts as the last card and one of our tableau piles, and 1:13 we just turned over the eight of clubs into the waste, 1:18 we can play that eight of clubs right below our nine of hearts. 1:21 Also, if a tableau pile is empty, only a king is allowed to fill the void. 1:25 All right, if you're still not quite sure what's going on, 1:30 there's a link in the teacher's notes below to an online Solitaire game 1:34 that works just like ours will. 1:37 Now that we know how to play the game, let's get down to business. 1:40 For this course, we're only going to deal with the game logic. 1:44 That is, we won't be adding a user interface. 1:47 This way, we can use the same code for an Android app and a JavaFX app. 1:50 The only thing that'll be different is the UI code. 1:56 Also, since we won't be adding a UI, rather than use Android Studio, 1:59 we'll be doing all of our programming in IntelliJ IDEA. 2:04 So let's open up IntelliJ and get started. 2:07 The first thing we need to do is create the project, so 2:10 let's click Create New Project. 2:13 Then, on the left, pick Kotlin for the JVM, and hit Next. 2:15 Then let's name the project, Solitaire. 2:22 And hit Finish. 2:27 Hooray, you're your first Kotlin app. 2:30 Now, let's drill down to the source folder. 2:33 And, bummer, it doesn't look like it gave us a main class. 2:36 But, no worries, we can just make our own. 2:39 Let's right-click on the Source folder, and choose New>Kotlin File/Class. 2:42 Then let's name it App, and hit OK to give us our first Kotlin file App.kt. 2:48 Next, we need to provide an entry point end to our Kotlin application. 2:55 Over in App.kt, let's type main, and then hit tab to generate the entry point. 2:58 And there we go. 3:05 Now, let's quickly run this to make sure everything's working. 3:06 But before we can run anything, we'll need to create a run debug configuration. 3:09 Luckily, IntelliJ makes this really easy for us. 3:14 Just click the Kotlin icon in the gutter next to our main function, and pick Run. 3:18 Then, IntelliJ will create a configuration for us and run the app. 3:25 Nice. 3:30 Now that everything's up and running, let's talk about that main function. 3:31 The first thing to note is the fun keyword. 3:34 All functions in Kotlin are declared with the fun keyword. 3:37 Then comes the name of the function, main. 3:41 And then inside the parentheses are any arguments. 3:44 Unlike Java, the name of the argument comes first, 3:47 followed by a colon and then the type, array of strings. 3:51 And if we wanted to return anything, we would add a colon 3:56 after the parentheses, and then specify the return type. 4:00 In Kotlin, instead of using void, we use Unit. 4:05 And just like in Java, we usually omit this for 4:09 functions that don't return anything, so let's undo that. 4:12 And now that we've got our entry point handled, 4:17 in the next video we'll start working on the game. 4:19
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