Aggiunti alcuni esercizi di java.

karls-languages/.exercism/config.json

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+{
+  "authors": [
+    "jmrunkle"
+  ],
+  "files": {
+    "solution": [
+      "src/main/java/LanguageList.java"
+    ],
+    "test": [
+      "src/test/java/LanguageListTest.java"
+    ],
+    "exemplar": [
+      ".meta/src/reference/java/LanguageList.java"
+    ],
+    "invalidator": [
+      "build.gradle"
+    ]
+  },
+  "icon": "language-list",
+  "blurb": "Learn about lists by helping Karl keep track of the languages he wants to learn on Exercism."
+}

karls-languages/.exercism/metadata.json

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+{"track":"java","exercise":"karls-languages","id":"6d0efea5b2474ac9bc05f47cef326263","url":"https://exercism.org/tracks/java/exercises/karls-languages","handle":"GicoProgram","is_requester":true,"auto_approve":false}

karls-languages/.gradle/buildOutputCleanup/cache.properties

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+#Tue Mar 07 18:38:49 CET 2023
+gradle.version=7.5.1

karls-languages/.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml

karls-languages/.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="11" />
+  </component>
+</project>

karls-languages/.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

karls-languages/.idea/jarRepositories.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenRepo" />
+      <option name="name" value="MavenRepo" />
+      <option name="url" value="https://repo.maven.apache.org/maven2/" />
+    </remote-repository>
+  </component>
+</project>

karls-languages/.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK" />
+</project>

karls-languages/HELP.md

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+# Help
+
+## Running the tests
+
+Choose your operating system:
+
+* [Windows](#windows)
+* [macOS](#macos)
+* [Linux](#linux)
+
+----
+
+1. Open a Command Prompt.
+2. Get the first exercise:
+
+     ```batchfile
+     C:\Users\JohnDoe>exercism download --exercise hello-world --track java
+
+     Not Submitted:     1 problem
+     java (Hello World) C:\Users\JohnDoe\exercism\java\hello-world
+
+     New:               1 problem
+     java (Hello World) C:\Users\JohnDoe\exercism\java\hello-world
+
+     unchanged: 0, updated: 0, new: 1
+   ```
+
+3. Change directory into the exercism:
+
+     ```batchfile
+     C:\Users\JohnDoe>cd C:\Users\JohnDoe\exercism\java\hello-world
+     ```
+   
+4. Run the tests:
+
+     ```batchfile
+     C:\Users\JohnDoe>gradle test
+     ```
+   *(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
+
+5. Solve the exercise.  Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
+
+
+Good luck!  Have fun!
+
+----
+
+1. In the terminal window, get the first exercise:
+
+     ```
+     $ exercism download --exercise hello-world --track java
+
+     New:                 1 problem
+     Java (Etl) /Users/johndoe/exercism/java/hello-world
+
+     unchanged: 0, updated: 0, new: 1
+    ```
+
+2. Change directory into the exercise:
+
+     ```
+     $ cd /Users/johndoe/exercism/java/hello-world
+     ```
+
+3. Run the tests:
+
+    ```
+    $ gradle test
+    ```
+   *(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
+
+4. Solve the exercise.  Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
+
+Good luck!  Have fun!
+
+----
+
+1. In the terminal window, get the first exercise:
+
+     ```
+     $ exercism download --exercise hello-world --track java
+
+     New:                 1 problem
+     Java (Etl) /home/johndoe/exercism/java/hello-world
+
+     unchanged: 0, updated: 0, new: 1
+
+    ```
+
+2. Change directory into the exercise:
+
+     ```
+     $ cd /home/johndoe/exercism/java/hello-world
+     ```
+
+3. Run the tests:
+
+    ```
+    $ gradle test
+    ```
+   *(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
+
+4. Solve the exercise.  Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
+
+Good luck!  Have fun!
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit src/main/java/LanguageList.java` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Java track's documentation](https://exercism.org/docs/tracks/java)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+If you need some help you can visit these resources:
+
+* [Stack Overflow](https://stackoverflow.com/questions/tagged/java),
+* [The Java subreddit](https://www.reddit.com/r/java),
+* [Official Java documentation](https://docs.oracle.com/en/java/javase/11/docs/api/index.html).

karls-languages/HINTS.md

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+# Hints
+
+## 1. Define a function to check if the language list is empty
+
+* Try using the [`isEmpty()`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#isEmpty()) method.
+
+## 2. Define a function to add a language to the list
+
+* Try using the [`add(E element)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#add(E)) method.
+* Reminder: methods that return `void` do not need any `return` statements.
+
+## 3. Define a function to remove a language from the list
+
+* Try using the [`remove(Object o)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#remove(java.lang.Object)) method.
+* Reminder: methods that return `void` do not need any `return` statements.
+
+## 4. Define a function to return the first item in the list
+
+* Try using the [`get(int index)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#get(int)) method.
+
+## 5. Define a function to return how many languages are in the list
+
+* Try using the [`size()`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#size()) method.
+
+## 6. Define a function to determine if a language is in the list
+
+* Try using the [`contains(Object o)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#contains(java.lang.Object)) method.
+
+## 7. Define a function to determine if the list is exciting
+
+* Try using a [for-each loop](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/for.html) through all of the elements, checking each one.
+* Alternatively, try using the `containsLanguage` method from the previous step.

karls-languages/README.md

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+# Karl's Languages
+
+Welcome to Karl's Languages on Exercism's Java Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
+
+## Introduction
+
+## Generic Types
+
+A **generic type** is a generic class or interface that is parameterized over types.
+This allows the compiler to enforce type safety on the class or interface.
+
+Consider this non-generic `Container` interface:
+
+```java
+class Container {
+    private Object object;
+
+    public void set(Object object) { this.object = object; }
+    public Object get() { return object; }
+}
+```
+
+Since it accepts and returns Object types, it works with any non-primitive type.
+However, this comes at a cost because some code may call `get` expecting `Integer`s while other code calls `set` adding `String`s resulting in a runtime exception.
+
+A **generic class** and **generic interface** have the following formats:
+
+```java
+class ClassName<T1, T2, ..., Tn> { ... }
+interface InterfaceName<T1, T2, ..., Tn> { ... }
+```
+
+The type parameter section, delimited by angle brackets (`<>`), following the class or interface name specifies the type parameters (also called type variables) `T1`, `T2`, ..., and `Tn`.
+These can be used inside the body of the class or interface to get generic type safety.
+
+Here is the generic version of `Container`:
+
+```java
+class Container<E> {
+    private E object;
+
+    public void set(E object) { this.object = object; }
+    public E get() { return object; }
+}
+```
+
+When created, now we have to declare what type it holds and the compiler will enforce that constraint:
+
+```java
+// empty <> can infer from context
+Container<String> stringContainer = new Container<>();
+// compiler knows this is a String, so it is allowed
+stringContainer.set("Some string");
+// no cast needed, compiler knows it is a String
+String result = stringContainer.get();
+// this causes a compiler error:
+stringContainer.set(42);
+```
+
+## Lists
+
+**Lists** are the ordered sequence collection in Java.
+Unlike arrays, a [`List`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html) can grow in size to accomodate any number of items.
+One standard implementation is the `ArrayList` which is backed by a re-sizable array.
+Another standard implementation is the `LinkedList` class which is backed by a doubly-linked list.
+
+`List`s may be empty or hold any number of items (including duplicates).
+`List`s are a **generic interface** typed to indicate which type of objects they can contain.
+For example:
+
+```java
+List<String> emptyListOfStrings = List.of();
+List<Integer> singleInteger = List.of(1);
+List<Boolean> threeBooleans = List.of(true, false, true);
+List<Object> listWithMulitipleTypes = List.of("hello", 1, true);
+```
+
+`List`s have various helpful methods to add, remove, get, and check for an element to be present:
+
+```java
+List<Character> vowels = new ArrayList<>(List.of('a', 'e', 'i', 'o', 'i', 'e', 'a'));
+int startingSize = vowels.size(); // 7
+vowels.add('u'); // vowels is now ['a', 'e', 'i', 'o', 'i', 'e', 'a', 'u']
+char a = vowels.get(0); // 'a'
+boolean hadI = vowels.remove('i'); // true and vowels is now ['a', 'e', 'o', 'i', 'e', 'a', 'u']
+boolean hasI = vowels.contains('i'); // true (still have one more left)
+```
+
+## Instructions
+
+Karl wants to keep track of a list of languages to learn on Exercism's website.
+Karl needs to be able to add new languages, remove old ones and check if certain languages are in the list.
+It would be very exciting if Karl wants to learn Java or Kotlin!
+
+## 1. Define a function to check if the language list is empty
+
+Karl needs to know if his list of languages ever becomes empty so he can go find more to learn!
+Define a method called `isEmpty` which returns `true` if there are no languages in the list.
+
+```java
+if (languageList.isEmpty()) {
+    findMoreLanguagesToLearn();
+}
+```
+
+## 2. Define a function to add a language to the list
+
+Karl is looking forward to learning Kotlin and Python!
+Help Karl get started by defining a method called `addLanguage` which takes the language he wants to learn and adds it to the list.
+
+```java
+languageList.addLanguage("Kotlin");
+languageList.addLanguage("Python");
+```
+
+## 3. Define a function to remove a language from the list
+
+Karl decided he does not want to learn Scala right now.
+Help Karl remove it from the list by defining a method called `removeLanguage` which takes the language he is removing and removes it from the list.
+
+```java
+languageList.removeLanguage("Scala");
+```
+
+## 4. Define a function to return the first item in the list
+
+Karl wants to remember the first language he added to the list (that is still in the list).
+Define a method called `firstLanguage` that returns the first language in the list.
+
+```java
+String kotlin = languageList.firstLanguage(); // "Kotlin"
+```
+
+## 5. Define a function to return how many languages are in the list
+
+Karl needs to know how many languages he is trying to learn.
+Help Karl find the answer by defining a method called `count` which returns the number of languages in the list.
+
+```java
+int two = languageList.count(); // 2
+```
+
+## 6. Define a function to determine if a language is in the list
+
+Karl is trying to remember if he wanted to learn Python or Ruby.
+Define a method called `containsLanguage` which takes the language he is asking about so Karl can find out!
+
+```java
+boolean learningPython = languageList.containsLanguage("Python"); // true
+boolean learningRuby = languageList.containsLanguage("Ruby"); // false
+```
+
+## 7. Define a function to determine if the list is exciting
+
+If Karl wants to learn Java or Kotlin, that is very exciting!
+Define a method called `isExciting` that returns true if Karl wants to learn Java or Kotlin.
+
+```java
+javaLanguageList.isExciting() // true
+neitherKotlinNorJavaLanguageList.isExciting() // false
+```
+
+## Source
+
+### Created by
+
+- @jmrunkle

karls-languages/build.gradle

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+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+// set default encoding to UTF-8
+compileJava.options.encoding = "UTF-8"
+compileTestJava.options.encoding = "UTF-8"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testImplementation "junit:junit:4.13"
+  testImplementation "org.assertj:assertj-core:3.15.0"
+}
+
+test {
+  testLogging {
+    exceptionFormat = 'full'
+    showStandardStreams = true
+    events = ["passed", "failed", "skipped"]
+  }
+}

karls-languages/build/reports/tests/test/classes/LanguageListTest.html

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+<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<meta http-equiv="x-ua-compatible" content="IE=edge"/>
+<title>Test results - Class LanguageListTest</title>
+<link href="../css/base-style.css" rel="stylesheet" type="text/css"/>
+<link href="../css/style.css" rel="stylesheet" type="text/css"/>
+<script src="../js/report.js" type="text/javascript"></script>
+</head>
+<body>
+<div id="content">
+<h1>Class LanguageListTest</h1>
+<div class="breadcrumbs">
+<a href="../index.html">all</a> &gt; 
+<a href="../packages/default-package.html">default-package</a> &gt; LanguageListTest</div>
+<div id="summary">
+<table>
+<tr>
+<td>
+<div class="summaryGroup">
+<table>
+<tr>
+<td>
+<div class="infoBox" id="tests">
+<div class="counter">11</div>
+<p>tests</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="failures">
+<div class="counter">0</div>
+<p>failures</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="ignored">
+<div class="counter">0</div>
+<p>ignored</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="duration">
+<div class="counter">0.027s</div>
+<p>duration</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+</td>
+<td>
+<div class="infoBox success" id="successRate">
+<div class="percent">100%</div>
+<p>successful</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+<div id="tabs">
+<ul class="tabLinks">
+<li>
+<a href="#tab0">Tests</a>
+</li>
+</ul>
+<div id="tab0" class="tab">
+<h2>Tests</h2>
+<table>
+<thead>
+<tr>
+<th>Test</th>
+<th>Duration</th>
+<th>Result</th>
+</tr>
+</thead>
+<tr>
+<td class="success">addMultipleLanguages</td>
+<td class="success">0.024s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">addOneLanguage</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">boringLanguageList</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">countEmpty</td>
+<td class="success">0.002s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">countThree</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">empty</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">excitingLanguageListWithJava</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">excitingLanguageListWithKotlin</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">firstLanguage</td>
+<td class="success">0.001s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">nonEmpty</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+<tr>
+<td class="success">removeLanguage</td>
+<td class="success">0s</td>
+<td class="success">passed</td>
+</tr>
+</table>
+</div>
+</div>
+<div id="footer">
+<p>
+<div>
+<label class="hidden" id="label-for-line-wrapping-toggle" for="line-wrapping-toggle">Wrap lines
+<input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
+</label>
+</div>Generated by 
+<a href="http://www.gradle.org">Gradle 7.5.1</a> at 7 mar 2023, 18:43:26</p>
+</div>
+</div>
+</body>
+</html>

karls-languages/build/reports/tests/test/css/base-style.css

@@ -0,0 +1,179 @@
+
+body {
+    margin: 0;
+    padding: 0;
+    font-family: sans-serif;
+    font-size: 12pt;
+}
+
+body, a, a:visited {
+    color: #303030;
+}
+
+#content {
+    padding-left: 50px;
+    padding-right: 50px;
+    padding-top: 30px;
+    padding-bottom: 30px;
+}
+
+#content h1 {
+    font-size: 160%;
+    margin-bottom: 10px;
+}
+
+#footer {
+    margin-top: 100px;
+    font-size: 80%;
+    white-space: nowrap;
+}
+
+#footer, #footer a {
+    color: #a0a0a0;
+}
+
+#line-wrapping-toggle {
+    vertical-align: middle;
+}
+
+#label-for-line-wrapping-toggle {
+    vertical-align: middle;
+}
+
+ul {
+    margin-left: 0;
+}
+
+h1, h2, h3 {
+    white-space: nowrap;
+}
+
+h2 {
+    font-size: 120%;
+}
+
+ul.tabLinks {
+    padding-left: 0;
+    padding-top: 10px;
+    padding-bottom: 10px;
+    overflow: auto;
+    min-width: 800px;
+    width: auto !important;
+    width: 800px;
+}
+
+ul.tabLinks li {
+    float: left;
+    height: 100%;
+    list-style: none;
+    padding-left: 10px;
+    padding-right: 10px;
+    padding-top: 5px;
+    padding-bottom: 5px;
+    margin-bottom: 0;
+    -moz-border-radius: 7px;
+    border-radius: 7px;
+    margin-right: 25px;
+    border: solid 1px #d4d4d4;
+    background-color: #f0f0f0;
+}
+
+ul.tabLinks li:hover {
+    background-color: #fafafa;
+}
+
+ul.tabLinks li.selected {
+    background-color: #c5f0f5;
+    border-color: #c5f0f5;
+}
+
+ul.tabLinks a {
+    font-size: 120%;
+    display: block;
+    outline: none;
+    text-decoration: none;
+    margin: 0;
+    padding: 0;
+}
+
+ul.tabLinks li h2 {
+    margin: 0;
+    padding: 0;
+}
+
+div.tab {
+}
+
+div.selected {
+    display: block;
+}
+
+div.deselected {
+    display: none;
+}
+
+div.tab table {
+    min-width: 350px;
+    width: auto !important;
+    width: 350px;
+    border-collapse: collapse;
+}
+
+div.tab th, div.tab table {
+    border-bottom: solid #d0d0d0 1px;
+}
+
+div.tab th {
+    text-align: left;
+    white-space: nowrap;
+    padding-left: 6em;
+}
+
+div.tab th:first-child {
+    padding-left: 0;
+}
+
+div.tab td {
+    white-space: nowrap;
+    padding-left: 6em;
+    padding-top: 5px;
+    padding-bottom: 5px;
+}
+
+div.tab td:first-child {
+    padding-left: 0;
+}
+
+div.tab td.numeric, div.tab th.numeric {
+    text-align: right;
+}
+
+span.code {
+    display: inline-block;
+    margin-top: 0em;
+    margin-bottom: 1em;
+}
+
+span.code pre {
+    font-size: 11pt;
+    padding-top: 10px;
+    padding-bottom: 10px;
+    padding-left: 10px;
+    padding-right: 10px;
+    margin: 0;
+    background-color: #f7f7f7;
+    border: solid 1px #d0d0d0;
+    min-width: 700px;
+    width: auto !important;
+    width: 700px;
+}
+
+span.wrapped pre {
+    word-wrap: break-word;
+    white-space: pre-wrap;
+    word-break: break-all;
+}
+
+label.hidden {
+    display: none;
+}

karls-languages/build/reports/tests/test/css/style.css

@@ -0,0 +1,84 @@
+
+#summary {
+    margin-top: 30px;
+    margin-bottom: 40px;
+}
+
+#summary table {
+    border-collapse: collapse;
+}
+
+#summary td {
+    vertical-align: top;
+}
+
+.breadcrumbs, .breadcrumbs a {
+    color: #606060;
+}
+
+.infoBox {
+    width: 110px;
+    padding-top: 15px;
+    padding-bottom: 15px;
+    text-align: center;
+}
+
+.infoBox p {
+    margin: 0;
+}
+
+.counter, .percent {
+    font-size: 120%;
+    font-weight: bold;
+    margin-bottom: 8px;
+}
+
+#duration {
+    width: 125px;
+}
+
+#successRate, .summaryGroup {
+    border: solid 2px #d0d0d0;
+    -moz-border-radius: 10px;
+    border-radius: 10px;
+}
+
+#successRate {
+    width: 140px;
+    margin-left: 35px;
+}
+
+#successRate .percent {
+    font-size: 180%;
+}
+
+.success, .success a {
+    color: #008000;
+}
+
+div.success, #successRate.success {
+    background-color: #bbd9bb;
+    border-color: #008000;
+}
+
+.failures, .failures a {
+    color: #b60808;
+}
+
+.skipped, .skipped a {
+    color: #c09853;
+}
+
+div.failures, #successRate.failures {
+    background-color: #ecdada;
+    border-color: #b60808;
+}
+
+ul.linkList {
+    padding-left: 0;
+}
+
+ul.linkList li {
+    list-style: none;
+    margin-bottom: 5px;
+}

karls-languages/build/reports/tests/test/index.html

@@ -0,0 +1,133 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<meta http-equiv="x-ua-compatible" content="IE=edge"/>
+<title>Test results - Test Summary</title>
+<link href="css/base-style.css" rel="stylesheet" type="text/css"/>
+<link href="css/style.css" rel="stylesheet" type="text/css"/>
+<script src="js/report.js" type="text/javascript"></script>
+</head>
+<body>
+<div id="content">
+<h1>Test Summary</h1>
+<div id="summary">
+<table>
+<tr>
+<td>
+<div class="summaryGroup">
+<table>
+<tr>
+<td>
+<div class="infoBox" id="tests">
+<div class="counter">11</div>
+<p>tests</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="failures">
+<div class="counter">0</div>
+<p>failures</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="ignored">
+<div class="counter">0</div>
+<p>ignored</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="duration">
+<div class="counter">0.027s</div>
+<p>duration</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+</td>
+<td>
+<div class="infoBox success" id="successRate">
+<div class="percent">100%</div>
+<p>successful</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+<div id="tabs">
+<ul class="tabLinks">
+<li>
+<a href="#tab0">Packages</a>
+</li>
+<li>
+<a href="#tab1">Classes</a>
+</li>
+</ul>
+<div id="tab0" class="tab">
+<h2>Packages</h2>
+<table>
+<thead>
+<tr>
+<th>Package</th>
+<th>Tests</th>
+<th>Failures</th>
+<th>Ignored</th>
+<th>Duration</th>
+<th>Success rate</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="success">
+<a href="packages/default-package.html">default-package</a>
+</td>
+<td>11</td>
+<td>0</td>
+<td>0</td>
+<td>0.027s</td>
+<td class="success">100%</td>
+</tr>
+</tbody>
+</table>
+</div>
+<div id="tab1" class="tab">
+<h2>Classes</h2>
+<table>
+<thead>
+<tr>
+<th>Class</th>
+<th>Tests</th>
+<th>Failures</th>
+<th>Ignored</th>
+<th>Duration</th>
+<th>Success rate</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="success">
+<a href="classes/LanguageListTest.html">LanguageListTest</a>
+</td>
+<td>11</td>
+<td>0</td>
+<td>0</td>
+<td>0.027s</td>
+<td class="success">100%</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+<div id="footer">
+<p>
+<div>
+<label class="hidden" id="label-for-line-wrapping-toggle" for="line-wrapping-toggle">Wrap lines
+<input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
+</label>
+</div>Generated by 
+<a href="http://www.gradle.org">Gradle 7.5.1</a> at 7 mar 2023, 18:43:26</p>
+</div>
+</div>
+</body>
+</html>

karls-languages/build/reports/tests/test/js/report.js

@@ -0,0 +1,194 @@
+(function (window, document) {
+    "use strict";
+
+    var tabs = {};
+
+    function changeElementClass(element, classValue) {
+        if (element.getAttribute("className")) {
+            element.setAttribute("className", classValue);
+        } else {
+            element.setAttribute("class", classValue);
+        }
+    }
+
+    function getClassAttribute(element) {
+        if (element.getAttribute("className")) {
+            return element.getAttribute("className");
+        } else {
+            return element.getAttribute("class");
+        }
+    }
+
+    function addClass(element, classValue) {
+        changeElementClass(element, getClassAttribute(element) + " " + classValue);
+    }
+
+    function removeClass(element, classValue) {
+        changeElementClass(element, getClassAttribute(element).replace(classValue, ""));
+    }
+
+    function initTabs() {
+        var container = document.getElementById("tabs");
+
+        tabs.tabs = findTabs(container);
+        tabs.titles = findTitles(tabs.tabs);
+        tabs.headers = findHeaders(container);
+        tabs.select = select;
+        tabs.deselectAll = deselectAll;
+        tabs.select(0);
+
+        return true;
+    }
+
+    function getCheckBox() {
+        return document.getElementById("line-wrapping-toggle");
+    }
+
+    function getLabelForCheckBox() {
+        return document.getElementById("label-for-line-wrapping-toggle");
+    }
+
+    function findCodeBlocks() {
+        var spans = document.getElementById("tabs").getElementsByTagName("span");
+        var codeBlocks = [];
+        for (var i = 0; i < spans.length; ++i) {
+            if (spans[i].className.indexOf("code") >= 0) {
+                codeBlocks.push(spans[i]);
+            }
+        }
+        return codeBlocks;
+    }
+
+    function forAllCodeBlocks(operation) {
+        var codeBlocks = findCodeBlocks();
+
+        for (var i = 0; i < codeBlocks.length; ++i) {
+            operation(codeBlocks[i], "wrapped");
+        }
+    }
+
+    function toggleLineWrapping() {
+        var checkBox = getCheckBox();
+
+        if (checkBox.checked) {
+            forAllCodeBlocks(addClass);
+        } else {
+            forAllCodeBlocks(removeClass);
+        }
+    }
+
+    function initControls() {
+        if (findCodeBlocks().length > 0) {
+            var checkBox = getCheckBox();
+            var label = getLabelForCheckBox();
+
+            checkBox.onclick = toggleLineWrapping;
+            checkBox.checked = false;
+
+            removeClass(label, "hidden");
+         }
+    }
+
+    function switchTab() {
+        var id = this.id.substr(1);
+
+        for (var i = 0; i < tabs.tabs.length; i++) {
+            if (tabs.tabs[i].id === id) {
+                tabs.select(i);
+                break;
+            }
+        }
+
+        return false;
+    }
+
+    function select(i) {
+        this.deselectAll();
+
+        changeElementClass(this.tabs[i], "tab selected");
+        changeElementClass(this.headers[i], "selected");
+
+        while (this.headers[i].firstChild) {
+            this.headers[i].removeChild(this.headers[i].firstChild);
+        }
+
+        var h2 = document.createElement("H2");
+
+        h2.appendChild(document.createTextNode(this.titles[i]));
+        this.headers[i].appendChild(h2);
+    }
+
+    function deselectAll() {
+        for (var i = 0; i < this.tabs.length; i++) {
+            changeElementClass(this.tabs[i], "tab deselected");
+            changeElementClass(this.headers[i], "deselected");
+
+            while (this.headers[i].firstChild) {
+                this.headers[i].removeChild(this.headers[i].firstChild);
+            }
+
+            var a = document.createElement("A");
+
+            a.setAttribute("id", "ltab" + i);
+            a.setAttribute("href", "#tab" + i);
+            a.onclick = switchTab;
+            a.appendChild(document.createTextNode(this.titles[i]));
+
+            this.headers[i].appendChild(a);
+        }
+    }
+
+    function findTabs(container) {
+        return findChildElements(container, "DIV", "tab");
+    }
+
+    function findHeaders(container) {
+        var owner = findChildElements(container, "UL", "tabLinks");
+        return findChildElements(owner[0], "LI", null);
+    }
+
+    function findTitles(tabs) {
+        var titles = [];
+
+        for (var i = 0; i < tabs.length; i++) {
+            var tab = tabs[i];
+            var header = findChildElements(tab, "H2", null)[0];
+
+            header.parentNode.removeChild(header);
+
+            if (header.innerText) {
+                titles.push(header.innerText);
+            } else {
+                titles.push(header.textContent);
+            }
+        }
+
+        return titles;
+    }
+
+    function findChildElements(container, name, targetClass) {
+        var elements = [];
+        var children = container.childNodes;
+
+        for (var i = 0; i < children.length; i++) {
+            var child = children.item(i);
+
+            if (child.nodeType === 1 && child.nodeName === name) {
+                if (targetClass && child.className.indexOf(targetClass) < 0) {
+                    continue;
+                }
+
+                elements.push(child);
+            }
+        }
+
+        return elements;
+    }
+
+    // Entry point.
+
+    window.onload = function() {
+        initTabs();
+        initControls();
+    };
+} (window, window.document));

karls-languages/build/reports/tests/test/packages/default-package.html

@@ -0,0 +1,103 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<meta http-equiv="x-ua-compatible" content="IE=edge"/>
+<title>Test results - Default package</title>
+<link href="../css/base-style.css" rel="stylesheet" type="text/css"/>
+<link href="../css/style.css" rel="stylesheet" type="text/css"/>
+<script src="../js/report.js" type="text/javascript"></script>
+</head>
+<body>
+<div id="content">
+<h1>Default package</h1>
+<div class="breadcrumbs">
+<a href="../index.html">all</a> &gt; default-package</div>
+<div id="summary">
+<table>
+<tr>
+<td>
+<div class="summaryGroup">
+<table>
+<tr>
+<td>
+<div class="infoBox" id="tests">
+<div class="counter">11</div>
+<p>tests</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="failures">
+<div class="counter">0</div>
+<p>failures</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="ignored">
+<div class="counter">0</div>
+<p>ignored</p>
+</div>
+</td>
+<td>
+<div class="infoBox" id="duration">
+<div class="counter">0.027s</div>
+<p>duration</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+</td>
+<td>
+<div class="infoBox success" id="successRate">
+<div class="percent">100%</div>
+<p>successful</p>
+</div>
+</td>
+</tr>
+</table>
+</div>
+<div id="tabs">
+<ul class="tabLinks">
+<li>
+<a href="#tab0">Classes</a>
+</li>
+</ul>
+<div id="tab0" class="tab">
+<h2>Classes</h2>
+<table>
+<thread>
+<tr>
+<th>Class</th>
+<th>Tests</th>
+<th>Failures</th>
+<th>Ignored</th>
+<th>Duration</th>
+<th>Success rate</th>
+</tr>
+</thread>
+<tr>
+<td class="success">
+<a href="../classes/LanguageListTest.html">LanguageListTest</a>
+</td>
+<td>11</td>
+<td>0</td>
+<td>0</td>
+<td>0.027s</td>
+<td class="success">100%</td>
+</tr>
+</table>
+</div>
+</div>
+<div id="footer">
+<p>
+<div>
+<label class="hidden" id="label-for-line-wrapping-toggle" for="line-wrapping-toggle">Wrap lines
+<input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
+</label>
+</div>Generated by 
+<a href="http://www.gradle.org">Gradle 7.5.1</a> at 7 mar 2023, 18:43:26</p>
+</div>
+</div>
+</body>
+</html>

karls-languages/build/test-results/test/TEST-LanguageListTest.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite name="LanguageListTest" tests="11" skipped="0" failures="0" errors="0" timestamp="2023-03-07T17:43:26" hostname="giacomo-optiplex3080" time="0.029">
+  <properties/>
+  <testcase name="addMultipleLanguages" classname="LanguageListTest" time="0.024"/>
+  <testcase name="countEmpty" classname="LanguageListTest" time="0.002"/>
+  <testcase name="countThree" classname="LanguageListTest" time="0.0"/>
+  <testcase name="excitingLanguageListWithKotlin" classname="LanguageListTest" time="0.0"/>
+  <testcase name="addOneLanguage" classname="LanguageListTest" time="0.0"/>
+  <testcase name="empty" classname="LanguageListTest" time="0.0"/>
+  <testcase name="firstLanguage" classname="LanguageListTest" time="0.001"/>
+  <testcase name="boringLanguageList" classname="LanguageListTest" time="0.0"/>
+  <testcase name="excitingLanguageListWithJava" classname="LanguageListTest" time="0.0"/>
+  <testcase name="removeLanguage" classname="LanguageListTest" time="0.0"/>
+  <testcase name="nonEmpty" classname="LanguageListTest" time="0.0"/>
+  <system-out><![CDATA[]]></system-out>
+  <system-err><![CDATA[]]></system-err>
+</testsuite>

karls-languages/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

karls-languages/gradlew

@@ -0,0 +1,240 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

karls-languages/gradlew.bat

@@ -0,0 +1,91 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

karls-languages/src/main/java/LanguageList.java

@@ -0,0 +1,34 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class LanguageList {
+    private final List<String> languages = new ArrayList<>();
+
+    public boolean isEmpty() {
+        return languages.isEmpty();
+    }
+
+    public void addLanguage(String language) {
+        languages.add(language);
+    }
+
+    public void removeLanguage(String language) {
+        languages.remove(language);
+    }
+
+    public String firstLanguage() {
+        return languages.get(0);
+    }
+
+    public int count() {
+        return languages.size();
+    }
+
+    public boolean containsLanguage(String language) {
+        return languages.contains(language);
+    }
+
+    public boolean isExciting() {
+        return (languages.contains("Java") || languages.contains("Kotlin"));
+    }
+}

karls-languages/src/test/java/LanguageListTest.java

@@ -0,0 +1,100 @@
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class LanguageListTest {
+
+    LanguageList languageList = new LanguageList();
+
+    @Test
+    public void empty() {
+        assertThat(languageList.isEmpty()).isTrue();
+    }
+
+    @Test
+    public void nonEmpty() {
+        languageList.addLanguage("Java");
+
+        assertThat(languageList.isEmpty()).isFalse();
+    }
+
+    @Test
+    public void addOneLanguage() {
+        languageList.addLanguage("Java");
+
+        assertThat(languageList.containsLanguage("Java")).isTrue();
+        assertThat(languageList.containsLanguage("Python")).isFalse();
+    }
+
+    @Test
+    public void addMultipleLanguages() {
+        languageList.addLanguage("Java");
+        languageList.addLanguage("Ruby");
+        languageList.addLanguage("C++");
+
+        assertThat(languageList.containsLanguage("Java")).isTrue();
+        assertThat(languageList.containsLanguage("Ruby")).isTrue();
+        assertThat(languageList.containsLanguage("C++")).isTrue();
+        assertThat(languageList.containsLanguage("Python")).isFalse();
+    }
+
+    @Test
+    public void removeLanguage() {
+        languageList.addLanguage("Java");
+        languageList.addLanguage("Python");
+        languageList.addLanguage("Ruby");
+
+        languageList.removeLanguage("Python");
+
+        assertThat(languageList.containsLanguage("Java")).isTrue();
+        assertThat(languageList.containsLanguage("Python")).isFalse();
+        assertThat(languageList.containsLanguage("Ruby")).isTrue();
+    }
+
+    @Test
+    public void firstLanguage() {
+        languageList.addLanguage("Java");
+        languageList.addLanguage("Python");
+        languageList.addLanguage("Ruby");
+
+        assertThat(languageList.firstLanguage()).isEqualTo("Java");
+    }
+
+    @Test
+    public void countThree() {
+        languageList.addLanguage("Java");
+        languageList.addLanguage("Python");
+        languageList.addLanguage("Ruby");
+
+        assertThat(languageList.count()).isEqualTo(3);
+    }
+
+    @Test
+    public void countEmpty() {
+        assertThat(languageList.count()).isEqualTo(0);
+    }
+
+    @Test
+    public void excitingLanguageListWithJava() {
+        languageList.addLanguage("Java");
+
+        assertThat(languageList.isExciting()).isTrue();
+    }
+
+    @Test
+    public void excitingLanguageListWithKotlin() {
+        languageList.addLanguage("Python");
+        languageList.addLanguage("Kotlin");
+
+        assertThat(languageList.isExciting()).isTrue();
+    }
+
+    @Test
+    public void boringLanguageList() {
+        languageList.addLanguage("Python");
+        languageList.addLanguage("Ruby");
+        languageList.addLanguage("C++");
+
+        assertThat(languageList.isExciting()).isFalse();
+    }
+}