TAM - LEARN KOTLIN QUICKLY AND PYTHON CODING PRACTICE EXERCISES: Coding For Beginners

Create a file HelloWorld.kt with below content. HelloWorld.kt fun main (args:Array){ println( "Hello World" ) } Keyword fun is used to define a function. main is the main function of the application. Program execution starts from here. args:Array In Kotlin variable name is declared first, followed by the type. println("Hello World") Above statement prints the message Hello World to the console. println("Hello World") Above statement prints the message Hello World to the console.

As you see, unlike java, Kotlin statements do not end with ;. Compile HelloWorld.kt
Open command prompt and type the command kotlinc HelloWorld.kt. C:\Users\Krishna\Documents\Study\Kotlin\Programs>kotlinc HelloWorld.kt C:\Users\Krishna\Documents\Study\Kotlin\Programs>dir Volume in drive C is OSDisk Volume Serial Number is 1034-4F6F Directory of C:\Users\Krishna\Documents\Study\Kotlin\Programs 09/02/2017 11:18 AM

. 09/02/2017 11:18 AM
.. 09/02/2017 11:09 AM 57 HelloWorld.kt 09/02/2017 11:18 AM 980 HelloWorldKt.class 09/02/2017 11:18 AM
META-INF 2 File(s) 1,037 bytes 3 Dir(s) 63,190,188,032 bytes free As you see the output of dir command, you can observe, kotlin generates HelloWorldKt.class and a META-INF directory. Run HelloWorld.kt
You can run the HelloWorldkt file using kotlin HelloWorldKt command.

C:\Users\krishna\Documents\Study\Kotlin\Programs>kotlin HelloWorldKt Hello World Creating and run jar You can also create a jar file and run the jar file using java launcher. Use the command kotlinc HelloWorld.kt -include-runtime -d HelloWorld.jar to create a jar file. The include-runtime option tells kotlin compiler, include kotlin run time in HelloWorld.jar file. C:\Users\Krishna\Documents\Study\Kotlin\Programs>kotlinc HelloWorld.kt -include-runtime -d HelloWorld.jar C:\Users\Krishna\Documents\Study\Kotlin\Programs>dir Volume in drive C is OSDisk Volume Serial Number is 1034-4F6F Directory of C:\Users\Krishna\Documents\Study\Kotlin\Programs 09/02/2017 11:24 AM

. 09/02/2017 11:24 AM
.. 09/02/2017 11:24 AM 869,262 HelloWorld.jar 09/02/2017 11:09 AM 57 HelloWorld.kt 2 File(s) 869,319 bytes 2 Dir(s) 63,401,816,064 bytes free Once the jar file is created, you can call the jar file, just like how you run other jar files.

Use the command java -jar HelloWorld.jar C:\Users\Krishna\Documents\Study\Kotlin\Programs>java -jar HelloWorld.jar Hello World

Create new Kotlin Project Open Eclipse. File -> New -> Other. Kotlin -> Kotlin Project. Press Next. In the Kotlin Project window, give the project name as Hello World and click on the button Finish. Create HelloWorld.kt file Right click on src folder -> New -> Other. Select Kotlin File and press Next. Give the file name as HelloWorld and press the button Finish. Copy below snippet to HelloWorld.kt file. Copy below snippet to HelloWorld.kt file.

HelloWorld.kt fun main (args: Array) { println( "Hello World" ) } Run HelloWorld.kt file
Right click on source code of HelloWorld.kt file -> Run As -> Kotlin Application. If everything goes well, you can see the message Hello World in console.