See it. Do it. Learn it! Interest in the Kotlin programming language has been soaring. Kotlin’s effortless syntax and embrace of multiple programming styles are now fully supported in Spring Boot! In the video course Kotlin with Spring, seasoned IT trainer Matt Greencroft builds on your Java and Spring knowledge as you level up with Kotlin. This all-encompassing interactive journey gets you coding as you learn with lots of practical exercises and a cool hands-on real world case study: a theater booking system! You’ll be amazed at how much more productive you are when you combine the power of Spring with the flexibility and robustness of Kotlin!As Kotlin is gaining more and more popularity, it's crucial for anyone who knows Java to expand their horizons. This video course is the perfect doorway into Kotlin.
Distributed by Manning Publications
This course was created independently by big data expert Matt Greencroft and is distributed by Manning through our exclusive liveVideo platform.
About the subject
Kotlin is a modern programming language for the JVM developed by Jetbrains, the makers of the IntelliJ IDE. Besides Java, Kotlin is the only officially supported language for Android development. Fully interoperable with Java, Kotlin boasts a number of enhancements Java just doesn’t have. Say goodbye to repetitive boilerplate and null pointer exceptions and write code that’s expressive, understandable, and safe! What’s more, Kotlin allows for immutable and non-nullable variables, and you’ll be writing less code with fewer classes. Compared to other JVM languages, Kotlin is an easy transition for Java developers. And a smart one!About the video
Building Spring Boot Applications with the Kotlin Programming Language teaches you to write clean, concise, easily maintainable Kotlin code using Spring Boot. Watch and learn as Kotlin expert Matt Greencroft explains Kotlin syntax and its automatic benefits. You’ll explore Kotlin features such as immutable variables, null-safety operators, data classes, templates, and top level functions. Then, you’ll discover the design approaches that make the most of the Spring and Kotlin combination, including using Spring Boot’s Hibernate framework and the Thymeleaf template engine.You’ll dive into functional programming and reflection, and you’ll reinforce your learning with lots of helpful examples. Throughout the course, you’ll incorporate your new skills by building a real world theater booking system! With this value-rich visual learning experience, you’ll be more productive and—happier!—as you confidently create amazing, robust applications with Kotlin!
Table of Contents detailed table of contents
Introduction
Introduction
What is Kotlin?
Installing IntelliJ
Configuring IntelliJ
Working with Strings
Creating a new project in Kotlin
Variable declaration syntax
Inferring variable types and println
Using String templates
Multiple line strings
Other variable types
Using the Double and determining class types
The Int data type
Other data types
Casting in Java
Casting in Kotlin
Chapter review
Nullable variables
Creating variables that can contain a null value
Methods that work with nullable parameters
The null-safe and non-null asserted operators
The nothing object type
Functions
The function syntax and the Unit object
Creating and calling top level functions
Single expression functions
Using named parameters when calling functions
Other aspects of functions in Kotlin
Classes
Project structure and packages
The class declaration and class level attributes
Instantiating a class, and accessing the class attributes
Creating a simple constructor
Secondary constructors
Alternative class design
Overriding getters and setters
Functions within a class
Static functions
Data classes
Practical exercise 1
Explaining the challenge
Solution walkthrough
The If expression and object equality
The If keyword as an expression
Using if to do a null-safe check
The let function
Object equality and the when expression
Ranges and Looping
The While loop
Using for to loop through a collection
Destructuring with a for loop
Looping with the Range object
Collections
Mutable collections with immutable variables
Immutable lists
Mutable lists
Maps and sets
Working with Arrays
Practical exercise 2
Explaining the challenge
Solution walkthrough
Exceptions and Try Catch Blocks
Exceptions are unchecked
Throwing exceptions
Try as an expression
Use as an expression (try with resources)
Testing
Using Junit with Kotlin
The Kotlin test assertions
Testing for exceptions
Interfaces and Extending classes
Creating and implementing Interfaces
Class inheritance
Creating custom exceptions
Extension functions
Java interoperability
Instantiating classes and providing values to non-nullable variables
Using data classes
Using immutable lists
Exception handling
Using static functions
Importing a Kotlin jar into a Java project
Getting started with Spring Boot
Creating a project with the Spring Initializer
A hello world controller
Auto restarting an application
Overview of the case study we’ll be working on
Creating views and backing beans
Connecting views to controller functions
Adding services
Posting data to a controller
Dependency injection
Revisiting backing beans
Functional programming
Functional programming overview
Methods that take function parameters - the Java way
Methods that take function parameters - the Kotlin way
Functional programming with lists
Filter and flatmap
Reduce and Fold
Working with Maps
Getting started with Hibernate
Adding the Hibernate dependencies
The challenge of creating entities
Persisting data to a database
Practical exercise 3
Step 1 - explaining the challenge
Solution Walkthrough
Mappings between entities
Upgrading the view
Step 2 - explaining the challenge
Solution walkthrough
Step 3 - explaining the challenge
Solution walkthrough
Reflection
The concept of reflection
Inspecting properties and functions
A practical use for reflection
Thank you and goodbye!
Prerequisites
Perfect for Java programmers with some experience with Spring Boot. No Kotlin experience is required.What you will learn
- Functional programming with collections
- Creating immutable and non-nullable variables
- How Kotlin helps you avoid null pointer exceptions
- Exception handling in Kotlin, including custom exceptions
- Using Spring Boot with Kotlin, including Hibernate and Thymeleaf
- Converting existing Java apps to Kotlin
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