Kotlin is a statically typed programming language for modern multi-platform applications. It is also 100% interoperable with Java and Android. Furthermore, it allows for concise, and null-safe codes.
Basics
- Compile and Run Kotlin codes without using an IDE
Learn how IDEs compile and run Kotlin codes by actually doing them yourself. - Create a Maven project for Kotlin
Create and use Maven as you would for Java projects with just a few changes to your pom.xml. - Using Kotlin in Java codes
Yes, you can port existing modules written in Java to Kotlin and use them as if nothing has changed! - Kotlin val and var keywords
You need to know when a variable is mutable and immutable. - Singletons in Kotlin
Write fewer codes when writing singleton classes with Kotlin. - Overloading constructors
Learn how to overload constructors! It ain’t hard. - Static fields and methods
Kotlin has them too! - Use enum in Kotlin
Some examples of how to useenuminKotlin. - Extension Functions
Add new properties and behaviors to your class without changing its class definition - Kotlin Class Delegation
Learn how to use Kotlin support for the Delegation pattern
Practical Solutions
Web Services
SOAP
REST
- In progress
Input/Output
- Read text files from classpath
More often than not, applications read text files from somewhere specially from the classpath.
Lists
- Lists, lists, lists!
There is no way you could avoid using lists in OOP. With Kotlin, it is easier to create them. - Convert comma-separated String to a list
Convert “a,b,c” to a list with items “a”, “b”, and “c”. - Check if value exists in a list
There is a better way than looping the list, getting each item and checking its value.
Maps
- Check if key exists in a map
Find something in a map by keys
Java 8 Date/Time API
- Using Java 8 Date and Time API in Kotlin
What Java has, Kotlin has too!
With Spring
- @Autowired Kotlin codes
How to autowire Kotlin stuff in Spring - Spring Boot and Kotlin
Create a Kotlin-based Spring Boot applications - Spring Boot, Spring MVC, and Kotlin
Web applications are written in Kotlin using Spring
XML
DOM
Validation
