![]() The application we will be writing does nothing else but display the text Hello World! on the console. $ brew update $ brew install that all of this is done, we can finally write our first Kotlin code. All you need to do is execute the following commands in a terminal: $ curl -s | bash $ bash $ sdk install kotlin 1.1-M04Īlternatively, if you are using OS X and you have homebrew installed, you could run these commands to achieve the same thing: If your machine runs Linux or OS X, there is an even easier way to install the compiler by using sdkman. Now you need to make sure the bin folder location is part of your system PATH in order to call the kotlinc without having to specify the full path. The output folder will contain a subfolder bin with all the scripts required to compile and run Kotlin on Windows, Linux, or OS X. To get your hands on it, navigate to, scroll to the bottom of the page, and download and unpack the ZIP archive to a known location on your machine. Every runtime release comes with its own compiler version. At the time of writing, version 1.1 milestone 4 is available (the stable release is 1.0.6). To write and execute code written in Kotlin, you will need its runtime and the compiler. Using the command line to compile and run Kotlin code If you are new to the JVM world, you can get the latest version from. For this book, however, all the code examples will be run with Java JDK 8. To be able to write code for Android, where the most recent supported Java version is 6, the compiler needs to translate your code to bytecode that is compatible at least with Java 6. Because of this, of course, Kotlin code can call Java code, and vice versa! Therefore, you need to have the Java JDK installed on your machine. ![]() Kotlin is a JVM language, and so the compiler will emit Java bytecode. We will provide a few examples using the compiler from the command line, and then we will move towards the typical way of programming using the IDEs and build tools available. ![]() In this chapter, we will go over and write the typical entry code for every language: the famous Hello World! In order to do that, we will need to set up the initial environment required to develop software with Kotlin. ![]()
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