diff --git a/.classpath b/.classpath
deleted file mode 100644
index 4f2c72b..0000000
--- a/.classpath
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
-		<attributes>
-			<attribute name="module" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="output" path="bin"/>
-</classpath>
diff --git a/.gitignore b/.gitignore
index 541f92c..a2d3d1f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,30 @@
-# Add any directories, files, or patterns you don't want to be tracked by version control
\ No newline at end of file
+# Add any directories, files, or patterns you don't want to be tracked by version control
+# Created by https://www.gitignore.io/api/Java
+# Edit at https://www.gitignore.io/?templates=Java
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# End of https://www.gitignore.io/api/Java
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 44ae3bd..9b515cb 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="13" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/classes" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/sonarlint/issuestore/index.pb b/.idea/sonarlint/issuestore/index.pb
new file mode 100644
index 0000000..456e083
--- /dev/null
+++ b/.idea/sonarlint/issuestore/index.pb
@@ -0,0 +1,18 @@
+
+]
+-src/com/oracle/java8/professional/IOTest.java,2/5/256872af8ce66ce60eaccb123cd94778ca7c1b24
+g
+7src/com/oracle/java8/professional/generics/Manager.java,c/2/c2e4d1a9d54eaeec7360dd193d060bbe6db1c833
+i
+9src/com/oracle/java8/professional/generics/Impiegato.java,c/9/c9913981b642acf244fd2a4b18e61651b83a7eb4
+c
+3src/com/oracle/java8/professional/GenericsTest.java,2/a/2a6ec68b1aba08f547a1a3b52e5072d77f696f22
+e
+5src/com/oracle/java8/professional/io/ConsoleTest.java,f/5/f5825707b147651834e383d2dcfcacbf7feb6ba6
+^
+.src/com/oracle/java8/professional/NIOTest.java,3/a/3a558ed8f214ab22b1e85d83fca719f07d778a6b
+K
+OracleCertificationTest.iml,0/3/03d5adc720bc72235fbbb4a0b526feeda869cd76
+:
+
+.gitignore,a/5/a5cc2925ca8258af241be7e5b0381edf30266302
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..a7b65c7
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,167 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="BranchesTreeState">
+    <expand>
+      <path>
+        <item name="ROOT" type="e8cecc67:BranchNodeDescriptor" />
+        <item name="LOCAL_ROOT" type="e8cecc67:BranchNodeDescriptor" />
+      </path>
+      <path>
+        <item name="ROOT" type="e8cecc67:BranchNodeDescriptor" />
+        <item name="REMOTE_ROOT" type="e8cecc67:BranchNodeDescriptor" />
+      </path>
+      <path>
+        <item name="ROOT" type="e8cecc67:BranchNodeDescriptor" />
+        <item name="REMOTE_ROOT" type="e8cecc67:BranchNodeDescriptor" />
+        <item name="GROUP_NODE:origin" type="e8cecc67:BranchNodeDescriptor" />
+      </path>
+    </expand>
+    <select />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="7689427a-6b8c-43cf-a2b5-7eb7ae541ad3" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.classpath" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/sonarlint/issuestore/index.pb" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/sonarlint/issuestore/index.pb" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.project" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.settings/org.eclipse.jdt.core.prefs" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.vscode/launch.json" beforeDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="CodeStyleSettingsInfer">
+    <option name="done" value="true" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectCodeStyleSettingsMigration">
+    <option name="version" value="1" />
+  </component>
+  <component name="ProjectId" id="1XtW4Cv6Jj7Gvlhk7hHpikOtIsR" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">
+    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
+    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
+  </component>
+  <component name="RunManager">
+    <configuration name="InnerClassDemo" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.oracle.java8.associate.InnerClassDemo" />
+      <module name="OracleCertificationTest" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="com.oracle.java8.associate.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="Application.InnerClassDemo" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="7689427a-6b8c-43cf-a2b5-7eb7ae541ad3" name="Default Changelist" comment="" />
+      <created>1581865677580</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1581865677580</updated>
+      <workItem from="1581865678731" duration="45000" />
+      <workItem from="1588399470293" duration="828000" />
+      <workItem from="1588406335490" duration="577000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="2" />
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+    <option name="oldMeFiltersMigrated" value="true" />
+  </component>
+  <component name="WindowStateProjectService">
+    <state x="745" y="478" key="#com.intellij.ide.util.projectWizard.JdkChooserPanel.MyDialog" timestamp="1581865697666">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state x="745" y="478" key="#com.intellij.ide.util.projectWizard.JdkChooserPanel.MyDialog/0.23.1792.1097@0.23.1792.1097" timestamp="1581865697666" />
+    <state width="1750" height="675" key="GridCell.Tab.0.bottom" timestamp="1588406643415">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.0.bottom/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643415" />
+    <state width="1750" height="675" key="GridCell.Tab.0.center" timestamp="1588406643415">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.0.center/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643415" />
+    <state width="1750" height="675" key="GridCell.Tab.0.left" timestamp="1588406643414">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.0.left/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643414" />
+    <state width="1750" height="675" key="GridCell.Tab.0.right" timestamp="1588406643415">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.0.right/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643415" />
+    <state width="1750" height="675" key="GridCell.Tab.1.bottom" timestamp="1588406643416">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.1.bottom/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643416" />
+    <state width="1750" height="675" key="GridCell.Tab.1.center" timestamp="1588406643416">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.1.center/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643416" />
+    <state width="1750" height="675" key="GridCell.Tab.1.left" timestamp="1588406643415">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.1.left/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643415" />
+    <state width="1750" height="675" key="GridCell.Tab.1.right" timestamp="1588406643416">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state width="1750" height="675" key="GridCell.Tab.1.right/0.23.1792.1097@0.23.1792.1097" timestamp="1588406643416" />
+    <state x="561" y="268" key="search.everywhere.popup" timestamp="1588401428428">
+      <screen x="0" y="23" width="1792" height="1097" />
+    </state>
+    <state x="561" y="268" key="search.everywhere.popup/0.23.1792.1097@0.23.1792.1097" timestamp="1588401428428" />
+  </component>
+  <component name="XDebuggerManager">
+    <breakpoint-manager>
+      <breakpoints>
+        <line-breakpoint enabled="true" type="java-line">
+          <url>file://$PROJECT_DIR$/src/com/oracle/java8/associate/InnerClassDemo.java</url>
+          <line>10</line>
+          <option name="timeStamp" value="2" />
+        </line-breakpoint>
+      </breakpoints>
+    </breakpoint-manager>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.project b/.project
deleted file mode 100644
index 35daf53..0000000
--- a/.project
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>OracleCertificationTest</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-	</natures>
-</projectDescription>
diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
deleted file mode 100644
index 3a21537..0000000
--- a/.settings/org.eclipse.jdt.core.prefs
+++ /dev/null
@@ -1,11 +0,0 @@
-eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
-org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.8
-org.eclipse.jdt.core.compiler.debug.lineNumber=generate
-org.eclipse.jdt.core.compiler.debug.localVariable=generate
-org.eclipse.jdt.core.compiler.debug.sourceFile=generate
-org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
-org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.source=1.8
diff --git a/.vscode/launch.json b/.vscode/launch.json
deleted file mode 100644
index 5916c1e..0000000
--- a/.vscode/launch.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-    "configurations": [
-        {
-            "type": "java",
-            "name": "CodeLens (Launch) - NIOTest",
-            "request": "launch",
-            "cwd": "${workspaceFolder}",
-            "console": "internalConsole",
-            "stopOnEntry": false,
-            "mainClass": "com.oracle.java8.professional.NIOTest",
-            "args": "",
-            "projectName": "OracleCertificationTest"
-        },
-        {
-            "type": "java",
-            "name": "CodeLens (Launch) - ConsoleTest",
-            "request": "launch",
-            "cwd": "${workspaceFolder}",
-            "console": "internalConsole",
-            "stopOnEntry": false,
-            "mainClass": "com.oracle.java8.professional.io.ConsoleTest",
-            "args": "",
-            "projectName": "OracleCertificationTest"
-        },
-        {
-            "type": "java",
-            "name": "CodeLens (Launch) - IOTest",
-            "request": "launch",
-            "cwd": "${workspaceFolder}",
-            "console": "internalConsole",
-            "stopOnEntry": false,
-            "mainClass": "com.oracle.java8.professional.IOTest",
-            "args": "",
-            "projectName": "OracleCertificationTest"
-        }
-    ]
-}
\ No newline at end of file