Getting Started With Kotlin
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Kotlin is a statically typed language for the JVM, Android, and browser that was created by JetBrains in response to limitations in Java. It focuses on interoperability with Java code and libraries. Kotlin allows avoiding null pointer exceptions, supports functional and procedural programming, and concise code. It is the official language for Android app development. The document discusses Kotlin basics like variables, strings, functions, classes, data classes, and control flows and how to configure Kotlin in Android Studio projects.
Getting Started With Kotlin
- 1. Kotlin for Android Getting started with kotlin By : Gaurav Sharma
- 2. What is Kotlin ? Statically typed programming language for the JVM, Android and the browser. The language was created in response to limitations in Java which were hindering development of JetBrains' software products and after an evaluation of all other JVM languages proved unsuitable. Since the goal of Kotlin was for use in improving their products, it focuses very strongly on interop with Java code and the Java standard library.
- 3. Known limitation in JAVA Inability to add method to platform types
- 4. The Billion Dollar Mistake Null Pointer Exception
- 5. Tracing Null Pointer Exception
- 6. Why to use kotlin ? 100% Java Interoperability Null Safe Combine the Best of Functional and Procedural Programming Concise code Smart Casting Default Arguments Named Arguments Official programming language for Android
- 7. Basic Syntax Variable and Constants in java Variable and Constants in Kotlin Type inference Manual Type Compiler give error about type annotation or initialize variable
- 8. String Kotlin have two type of string literals Escaped String Raw String String Template
- 9. Functions in Kotlin Function are defined using keyword fun Default return type of any function is Unit Function with an expression body and inferred return type:
- 10. Classes in Kotlin Classes are declared using keyword class Primary Constructor in kotlin Secondary Constructor in kotlin
- 11. Java Bean Class
- 12. Same Java Bean class in Kotlin When we mark a class as a data class. hashCode() equals() toString() copy()
- 14. Requirement to make data class The primary constructor needs to have at least one parameter; All primary constructor parameters need to be marked as val or var; Data classes cannot be abstract, open, sealed or inner;
- 15. Copy objects TRUE (Property equality) False False(Referential equality)
- 16. Named Arguments Default Arguments O/p James 17 is a geek O/p Gogo 10 is a geek
- 17. Loops in kotlin For loop For loop using range For loop using range with progression While loop
- 18. Extension Extension Function o/p - V o/p - 321
- 19. Null Safety
- 20. Configuring Kotlin in android studio Preferences > Plugins > Install Jetbrains Plugin > Search Kotlin > Install Android Studio 3.0 is bundled with kotlin
- 21. Creating the project in earlier ide
- 25. Configure Kotlin In Android Project
- 28. Converting Java To Kotlin MainActivity Before Conversion
- 30. Creating New Project Using Android Studio 3.0
- 35. Thanks
Editor's Notes
- #3: What is kotlin
- #11: pr
- #19: 1) provides the ability to extend a class with new functionality without having to inherit from the class or use any type of design pattern such as Decorator
- #20: One of the most common pitfalls in many programming languages, including Java, is that of accessing a member of a null reference, resulting in a null reference exception.