Improve java doc (#6)

* Improve java doc

* Fix

.gitignore

@@ -1 +1,2 @@
-.idea
+.idea
+.DS_Store

README.md

@@ -7,10 +7,23 @@
 [![CI](https://github.com/rogervinas/tests-everywhere/actions/workflows/java.yml/badge.svg)](https://github.com/rogervinas/tests-everywhere/actions/workflows/java.yml)
 ![Java](https://img.shields.io/badge/Java-21-blue?labelColor=black)
 
-Using:
-* [JUnit5](https://junit.org/junit5/)
-* [Mockito](https://site.mockito.org/)
-* [AssertJ](https://assertj.github.io/doc/)
+Java testing with [JUnit5](https://junit.org/junit5/), [Mockito](https://site.mockito.org/) and [AssertJ](https://assertj.github.io/doc/)
+
+### Pre-requisites
+* Install [Java](https://openjdk.org/) and [Gradle](https://gradle.org/) manually or ...
+  * Install [SdkMan](https://sdkman.io/) and ...
+    * Install **Java** using `sdk install java 21-tem` (use `sdk list java` to see all versions)
+    * Install **Gradle** using `sdk install grade 8.4` (use `sdk list gradle` to see all versions) 
+
+### Create project from scratch
+* Create project using `gradle init --type java-application --test-framework junit-jupiter`
+* Add required dependencies in `build.gradle.kts`:
+  * `testImplementation("org.mockito:mockito-core:x.x.x")`
+  * `testImplementation("org.assertj:assertj-core:x.x.x")`
+
+### Run this project
+* Test with `./gradlew test`
+* Run with `./gradlew run`
 
 ## Kotlin
 
@@ -29,15 +42,23 @@ Using:
 
 JavaScript testing with [Jest](https://jestjs.io/)
 
-Pre-requisites:
-* Install [Node Version Manager](https://github.com/nvm-sh/nvm)
-* Install [Node.js](https://nodejs.org/en/) using `nvm use v18` or `nvm use stable`
+### Pre-requisites
+* Install [Node.js](https://nodejs.org/en/) manually or ...
+  * Install [Node Version Manager](https://github.com/nvm-sh/nvm) and ...
+    * Install **Node.js** executing `nvm use v18` or `nvm use stable`
 
-Create project from scratch:
+### Create project from scratch
 * Create project using `npm init`
 * Install [Jest](https://jestjs.io/) using `npm install --save-dev jest`
+* Configure scripts in `package.json`:
+  ```json
+  "scripts": {
+    "start": "node index.js",
+    "test": "jest"
+  }
+  ```
 
-Run this project:
+### Run this project
 * Install dependencies running `npm install`
 * Test with `npm test`
 * Run with `npm start`

java/build.gradle.kts

@@ -3,6 +3,7 @@ import org.gradle.api.tasks.testing.logging.TestLogEvent.*
 
 plugins {
   java
+  application
 }
 
 repositories {
@@ -32,3 +33,7 @@ tasks.named<Test>("test") {
     showStackTraces = true
   }
 }
+
+application {
+  mainClass.set("org.hello.Main")
+}

java/src/main/java/org/hello/HelloConsole.java

@@ -1,5 +1,7 @@
 package org.hello;
 
-public interface HelloConsole {
-  void print(String text);
+public class HelloConsole {
+  public void print(String text) {
+    System.out.println(text);
+  }
 }

java/src/main/java/org/hello/Main.java

@@ -0,0 +1,10 @@
+package org.hello;
+
+public class Main {
+
+  public static void main(String[] args) {
+    var message = new HelloMessage();
+    var console = new HelloConsole();
+    new HelloApp(message, console).printHello();
+  }
+}