diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 9a035a18e6..1fb598ef96 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -15,6 +15,7 @@
       <module name="cwiki-us-demo-tutorials.spring-batch.main" target="11" />
       <module name="cwiki-us-demo-tutorials.spring-batch.test" target="11" />
       <module name="lang-tutorial" target="1.5" />
+      <module name="parent-modules" target="11" />
     </bytecodeTargetLevel>
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
index d33d98704d..45473da3cf 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -8,6 +8,7 @@
       <module fileurl="file://$PROJECT_DIR$/.idea/modules/spring-batch/cwiki-us-demo-tutorials.spring-batch.main.iml" filepath="$PROJECT_DIR$/.idea/modules/spring-batch/cwiki-us-demo-tutorials.spring-batch.main.iml" />
       <module fileurl="file://$PROJECT_DIR$/.idea/modules/spring-batch/cwiki-us-demo-tutorials.spring-batch.test.iml" filepath="$PROJECT_DIR$/.idea/modules/spring-batch/cwiki-us-demo-tutorials.spring-batch.test.iml" />
       <module fileurl="file://$PROJECT_DIR$/.idea/modules/cwiki-us-demo-tutorials.test.iml" filepath="$PROJECT_DIR$/.idea/modules/cwiki-us-demo-tutorials.test.iml" />
+      <module fileurl="file://$PROJECT_DIR$/parent-modules.iml" filepath="$PROJECT_DIR$/parent-modules.iml" />
     </modules>
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index bb5b1dd06d..f6b9efdc1c 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -27,29 +27,11 @@
       <change afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/interview/tests/WayfairTest.java" afterDir="false" />
       <change afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/interview/tests/others/LambdaEvensTest.java" afterDir="false" />
       <change afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/interview/tests/others/MinimumCoinsTest.java" afterDir="false" />
+    <list default="true" id="bc4dcfec-3698-4fde-a6cf-dd08b73f1f06" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.idea/compiler.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/compiler.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/modules.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/modules.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/pom.xml" beforeDir="false" afterPath="$PROJECT_DIR$/pom.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/readme.md" beforeDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/Main.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/codebank/algorithm/Main.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/models/ListNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/models/ListNode.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/models/TreeNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/models/TreeNode.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/objplusclass/CreateObject.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/codebank/algorithm/objplusclass/CreateObject.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/overview/FreshJuiceEnums.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/codebank/algorithm/overview/FreshJuiceEnums.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/overview/HelloWorld.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/codebank/algorithm/overview/HelloWorld.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/usecases/VarargsCase.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/codebank/algorithm/usecases/VarargsCase.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/ossez/lang/tutorial/utils/TreeUtils.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/ossez/codebank/algorithml/utils/TreeUtils.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/BitOperationTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/algorithm/tests/BitOperationTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/LintcodeTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/algorithm/tests/LintcodeTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/SingletonTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/algorithm/tests/SingletonTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/TreeTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/codebank/algorithm/tests/TreeTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/VariableTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/VariableTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/codility/CodilityBinaryGapTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/codility/CodilityBinaryGapTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0007SerializeAndDeserializeTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0007SerializeAndDeserializeTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0069LevelOrderTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0069LevelOrderTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0102HasCycleTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0102HasCycleTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0165MergeTwoListsTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0165MergeTwoListsTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0425LetterCombinationsTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0425LetterCombinationsTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0433NumIslandsTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode0433NumIslandsTest.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode1480DotProductTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/test/java/com/ossez/lang/tutorial/tests/lintcode/LintCode1480DotProductTest.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -110,21 +92,6 @@
       <recent name="C:\WorkDir\GitHub\cwiki-us-docs\java-tutorials\src\test\java\com\ossez\lang\tutorial\tests" />
     </key>
   </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">
     <task active="true" id="Default" summary="Default task">
@@ -137,6 +104,7 @@
       <workItem from="1618147512704" duration="6933000" />
       <workItem from="1618246818887" duration="17236000" />
       <workItem from="1618429441584" duration="12732000" />
+      <workItem from="1619207993732" duration="192000" />
     </task>
     <task id="LOCAL-00001" summary="更新 POM 文件">
       <created>1618147556538</created>
@@ -229,7 +197,14 @@
       <option name="project" value="LOCAL" />
       <updated>1618519836247</updated>
     </task>
-    <option name="localTasksCounter" value="14" />
+    <task id="LOCAL-00014" summary="OSSEZ-88 Change the name of Readme file and content for JDK version 11">
+      <created>1619208153576</created>
+      <option name="number" value="00014" />
+      <option name="presentableId" value="LOCAL-00014" />
+      <option name="project" value="LOCAL" />
+      <updated>1619208153576</updated>
+    </task>
+    <option name="localTasksCounter" value="15" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -261,6 +236,7 @@
     <MESSAGE value="Add name and URL before push to OSSRH" />
     <MESSAGE value="Upgrade to using JDK 11" />
     <MESSAGE value="Change name and description" />
-    <option name="LAST_COMMIT_MESSAGE" value="Change name and description" />
+    <MESSAGE value="OSSEZ-88 Change the name of Readme file and content for JDK version 11" />
+    <option name="LAST_COMMIT_MESSAGE" value="OSSEZ-88 Change the name of Readme file and content for JDK version 11" />
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index c2d39d08e8..a1f921bfe9 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,12 @@
-<p align="center">
-    <a href="https://www.hackerrank.com/huyuchengus">
-        <img height=85 src="https://avatars1.githubusercontent.com/u/45009982?s=200&v=4">
-    </a>
-    <br>提供 CWIKI.US 项目中使用的代码
-</p>
-
-所有的 Java 代码使用的是 JDK 8。
-
-你可以通过单击下面连接后访问我们网站，并且访问我们提供的最新有关 Java 的开发资料。 
-
+<p align="center">
+    <a href="https://www.hackerrank.com/huyuchengus">
+        <img height=85 src="https://avatars1.githubusercontent.com/u/45009982?s=200&v=4">
+    </a>
+    <br>提供 CWIKI.US 项目中使用的代码
+</p>
+
+所有的 Java 代码使用的是 JDK 11。
+
+你可以通过单击下面连接后访问我们网站，并且访问我们提供的最新有关 Java 的开发资料。 
+
 * [概述](https://www.cwiki.us/pages/viewpage.action?pageId=37492282)
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 4f23a99bd0..4ca10cc8bf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -239,8 +239,7 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
+                    <release>${java.version}</release>
                 </configuration>
             </plugin>
             <plugin>