Add JDK 14

.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_15" default="true" project-jdk-name="15" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_14" default="true" project-jdk-name="14" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file

.idea/workspace.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
   <component name="ChangeListManager">
     <list default="true" id="0242c1a9-e139-4946-98de-d110221679b6" name="Default Changelist" comment="" />
     <option name="SHOW_DIALOG" value="false" />
@@ -30,7 +33,25 @@
     <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
     <property name="WebServerToolWindowFactoryState" value="false" />
     <property name="aspect.path.notification.shown" value="true" />
-    <property name="settings.editor.selected.configurable" value="preferences.pluginManager" />
+    <property name="project.structure.last.edited" value="Modules" />
+    <property name="project.structure.proportion" value="0.15" />
+    <property name="project.structure.side.proportion" value="0.2" />
+    <property name="settings.editor.selected.configurable" value="configurable.group.appearance" />
+  </component>
+  <component name="RunManager">
+    <configuration default="true" type="ArquillianTestNG" factoryName="" nameIsGenerated="true">
+      <option name="arquillianRunConfiguration">
+        <value>
+          <option name="containerStateName" value="" />
+        </value>
+      </option>
+      <option name="TEST_OBJECT" value="CLASS" />
+      <properties />
+      <listeners />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
   </component>
   <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
   <component name="TaskManager">
@@ -42,7 +63,9 @@
       <updated>1606913408312</updated>
       <workItem from="1606913411014" duration="604000" />
       <workItem from="1606914026619" duration="112000" />
-      <workItem from="1606914293705" duration="989000" />
+      <workItem from="1606914293705" duration="3199000" />
+      <workItem from="1606917997099" duration="113000" />
+      <workItem from="1606918163106" duration="94000" />
     </task>
     <servers />
   </component>

puissance4_java.iml

@@ -5,7 +5,7 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
-    <orderEntry type="inheritedJdk" />
+    <orderEntry type="jdk" jdkName="14" jdkType="JavaSDK" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
   </component>