Gain insights into Java 17, cloud and microservices, reactive programming, and top JVM languages. Explore hands-on projects using Scala, Groovy, and Gradle to boost your software development career.

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Groovy

Scala

Java 12

Java 14

Java 16

Java 17

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Play

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SPA-play

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This course is meant for Java programmers or aspiring programmers who want to know about the latest Java and JVM technology. Throughout this course, you will get several opportunities to get hands-on experience with various Java concepts. 

This course will help you understand the latest in Java up to version 17; cloud and microservices; build, testing, and web frameworks; reactive programming in Java; and the best JVM languages so you can advance your career in software development. 

Moreover, you will also get to work with Scala, Groovy, and Gradle. The course explains Java concepts in detail and also draws comparisons with its older versions, as well as JVM languages.

The All-in-One Guide to Java Programming

# What is Spock?
**Spock** is a testing framework for Java and Groovy applications. The Spock website has this to say about Spock:
> "What makes it stand out from the crowd is its beautiful and highly expressive specification language. Thanks to its JUnit runner, Spock is compatible with most IDEs, build tools, and continuous integration servers. Spock is inspired from JUnit, RSpec, jMock, Mockito, Groovy, Scala, Vulcans, and other fascinating life forms."

The basic structure of a test class in Spock is a class that extends specification and has multiple methods with strings for names.

Spock processes the test code and allows us to use a simple groovy syntax to specify tests.

Each test is composed of labeled blocks of code with labels like `when`, `then`, and `where`. The best way to learn Spock is with examples.

# A simple test
Let’s start by recreating a simple test from the chapter on JUnit:

```
def "toString yields the String representation"() {
     def array = ['a', 'b', 'c'] as String[]
     when:
     def arrayWrapper = new ArrayWrapper<String>(array);
     then:
     arrayWrapper.toString() == '[a, b, c]'
}
```
As shown above, assertions are simply Groovy conditional expressions. If the above `==` expression returns `false`, the test will fail and Spock will give a detailed printout to explain why. In the absence of any `when` clause, you can use the `expect` clause instead of `then`. For example:

```
def "empty list size is zero"() {
  expect: [].size() == 0
}
```

Introduction

Introduction

Java Syntax and Conventions

Java 7

Idiomatic Java 8: Lambdas, Streams, and Dates

New Date and Time API

Java 8 Miscellaneous

Advantages of Java 9

Java 10 - 17

Java Ecosystem

Maven and JUnit

Utilizing Essential Libraries

Modern Java Concurrency

RxJava

Other JVM Languages

Groovy

Gradle

Spock

Scala

RESTful

Microservices and Clouds

Grails

Spark

Spring Boot

Play Framework

Ratpack

Final Thoughts

Appendix

Introduction

What is Spock?