diff --git a/README.md b/README.md
index 21a315b..446ffd0 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,10 @@
 - 从 github 自己的项目中对上游项目发起合并请求 (Pull Request)。
 - PR 被上游仓库开发者审核、测试，最终合并。
 
+### 保持fork的仓库以及本地仓库与原仓库一致
+- 获取原仓库 git fetch upstream
+- 将本地仓库同步到与原仓库一致 git merge upstream/master
+- 将本地仓库push到自己fork的仓库 git push origin master
 
 ### 参考资料
 
diff --git a/lesson2/.idea/gradle.xml b/lesson2/.idea/gradle.xml
deleted file mode 100644
index 02e891c..0000000
--- a/lesson2/.idea/gradle.xml
+++ /dev/null
@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GradleSettings">
-    <option name="linkedExternalProjectsSettings">
-      <GradleProjectSettings>
-        <option name="distributionType" value="LOCAL" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleHome" value="/usr/local/Cellar/gradle/4.10/libexec" />
-        <option name="modules">
-          <set>
-            <option value="$PROJECT_DIR$" />
-          </set>
-        </option>
-        <option name="useAutoImport" value="true" />
-      </GradleProjectSettings>
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/lesson2/.idea/misc.xml b/lesson2/.idea/misc.xml
index bc8d0a3..28a804d 100644
--- a/lesson2/.idea/misc.xml
+++ b/lesson2/.idea/misc.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/out" />
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
   </component>
 </project>
\ No newline at end of file
diff --git a/lesson2/.idea/modules.xml b/lesson2/.idea/modules.xml
new file mode 100644
index 0000000..7d7f18f
--- /dev/null
+++ b/lesson2/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/lesson2.iml" filepath="$PROJECT_DIR$/.idea/lesson2.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/lesson2/.idea/workspace.xml b/lesson2/.idea/workspace.xml
index 7d22b6a..beb7bd7 100644
--- a/lesson2/.idea/workspace.xml
+++ b/lesson2/.idea/workspace.xml
@@ -2,8 +2,9 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="3cf9276a-1775-4e31-91bd-d592b2feede1" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/JackWang/Sort.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/modules.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/.gradle/" />
     <ignored path="$PROJECT_DIR$/build/" />
@@ -142,23 +143,46 @@
         </counts>
       </usages-collector>
     </session>
+    <session id="1459187768">
+      <usages-collector id="statistics.lifecycle.project">
+        <counts>
+          <entry key="project.closed" value="5" />
+          <entry key="project.open.time.0" value="1" />
+          <entry key="project.open.time.10" value="1" />
+          <entry key="project.open.time.7" value="1" />
+          <entry key="project.open.time.9" value="2" />
+          <entry key="project.opened" value="5" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.extensions.edit">
+        <counts>
+          <entry key="java" value="31" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.types.edit">
+        <counts>
+          <entry key="JAVA" value="31" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.extensions.open">
+        <counts>
+          <entry key="java" value="1" />
+        </counts>
+      </usages-collector>
+      <usages-collector id="statistics.file.types.open">
+        <counts>
+          <entry key="JAVA" value="1" />
+        </counts>
+      </usages-collector>
+    </session>
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/Two.java">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="60">
-              <caret line="3" selection-start-line="3" selection-end-line="6" selection-end-column="3" />
-            </state>
-          </provider>
-        </entry>
-      </file>
       <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="260">
-              <caret line="13" column="41" lean-forward="true" selection-start-line="13" selection-start-column="41" selection-end-line="13" selection-end-column="41" />
+            <state relative-caret-position="209">
+              <caret line="11" column="12" selection-start-line="11" selection-start-column="12" selection-end-line="11" selection-end-column="12" />
             </state>
           </provider>
         </entry>
@@ -177,390 +201,21 @@
   </component>
   <component name="GradleLocalSettings">
     <option name="myGradleHomes">
-      <map>
-        <entry key="$PROJECT_DIR$" value="C:\Users\Jack wang\.gradle\wrapper\dists\gradle-4.8-bin\divx0s2uj4thofgytb7gf9fsi\gradle-4.8" />
-      </map>
+      <map />
     </option>
     <option name="myGradleVersions">
-      <map>
-        <entry key="$PROJECT_DIR$" value="4.8" />
-      </map>
-    </option>
-    <option name="availableProjects">
-      <map>
-        <entry>
-          <key>
-            <ExternalProjectPojo>
-              <option name="name" value="lesson2" />
-              <option name="path" value="$PROJECT_DIR$" />
-            </ExternalProjectPojo>
-          </key>
-          <value>
-            <list>
-              <ExternalProjectPojo>
-                <option name="name" value="lesson2" />
-                <option name="path" value="$PROJECT_DIR$" />
-              </ExternalProjectPojo>
-            </list>
-          </value>
-        </entry>
-      </map>
-    </option>
-    <option name="availableTasks">
-      <map>
-        <entry key="$PROJECT_DIR$">
-          <value>
-            <list>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Java class in the current project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createJavaClass" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the sub-projects of root project 'lesson2'." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="projects" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Exports all the default template files into the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="exportAllTemplates" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="pmd" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Run Checkstyle analysis for test classes" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="checkstyleTest" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Runs this project as a JVM application" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="run" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Generates Gradle wrapper files." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="wrapper" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Exports the default webapp template files into the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="exportWebappTemplates" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Exports the default groovy template files into the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="exportGroovyTemplates" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Initializes a new Gradle Plugin project in the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="initGradlePlugin" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="getHomeDir" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates OS specific scripts to run the project as a JVM application." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="startScripts" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles a jar archive containing the main classes." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="jar" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the configuration model of root project 'lesson2'. [incubating]" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="model" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="checkstyle" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Processes main resources." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="processResources" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the tasks runnable from root project 'lesson2'." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="tasks" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles the main distributions" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="assembleDist" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Initializes a new Gradle build." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="init" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Runs the unit tests." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="test" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Compiles main Java source." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="compileJava" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Runs all checks." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="check" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="checkCode" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays all dependencies declared in root project 'lesson2'." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="dependencies" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Processes test resources." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="processTestResources" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Gradle Java project in a new directory named after your project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createJavaProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Exports the default scala template files into the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="exportScalaTemplates" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Installs the 'archives' artifacts into the local Maven repository." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="install" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles and tests this project and all projects it depends on." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="buildNeeded" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Bundles the project as a distribution." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="distTar" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Gradle Webapp project in a new directory named after your project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createWebappProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Bundles the project as a distribution." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="distZip" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Exports the default java template files into the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="exportJavaTemplates" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Run PMD analysis for main classes" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="pmdMain" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the components produced by root project 'lesson2'. [incubating]" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="components" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles and tests this project and all projects that depend on it." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="buildDependents" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles main classes." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="classes" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the dependent components of components in root project 'lesson2'. [incubating]" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="dependentComponents" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Gradle Groovy project in a new directory named after your project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createGroovyProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Gradle Scala project in a new directory named after your project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createScalaProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays all buildscript dependencies declared in root project 'lesson2'." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="buildEnvironment" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Groovy class in the current project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createGroovyClass" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Initializes a new Gradle Webapp project in the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="initWebappProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles test classes." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="testClasses" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Generates Javadoc API documentation for the main source code." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="javadoc" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Run Checkstyle analysis for main classes" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="checkstyleMain" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Scala object in the current project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createScalaObject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Run PMD analysis for test classes" />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="pmdTest" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Exports the default plugin template files into the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="exportPluginTemplates" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Installs the project as a distribution as-is." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="installDist" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Gradle Plugin project in a new directory named after your project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createGradlePlugin" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the insight into a specific dependency in root project 'lesson2'." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="dependencyInsight" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Initializes a new Gradle Scala project in the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="initScalaProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles the outputs of this project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="assemble" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Deletes the build directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="clean" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Compiles test Java source." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="compileTestJava" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Creates a new Scala class in the current project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="createScalaClass" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays a help message." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="help" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Assembles and tests this project." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="build" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Initializes a new Gradle Groovy project in the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="initGroovyProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Initializes a new Gradle Java project in the current directory." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="initJavaProject" />
-              </ExternalTaskPojo>
-              <ExternalTaskPojo>
-                <option name="description" value="Displays the properties of root project 'lesson2'." />
-                <option name="linkedExternalProjectPath" value="$PROJECT_DIR$" />
-                <option name="name" value="properties" />
-              </ExternalTaskPojo>
-            </list>
-          </value>
-        </entry>
-      </map>
+      <map />
     </option>
     <option name="modificationStamps">
       <map>
         <entry key="$USER_HOME$/.gradle/gradle.properties" value="3680958690" />
-        <entry key="$PROJECT_DIR$" value="3084218818110" />
         <entry key="$PROJECT_DIR$/.gradle" value="0" />
         <entry key="$PROJECT_DIR$/build.gradle" value="1036151483" />
       </map>
     </option>
-    <option name="projectBuildClasspath">
-      <map>
-        <entry key="$PROJECT_DIR$">
-          <value>
-            <ExternalProjectBuildClasspathPojo>
-              <option name="modulesBuildClasspath">
-                <map>
-                  <entry key="$PROJECT_DIR$">
-                    <value>
-                      <ExternalModuleBuildClasspathPojo>
-                        <option name="entries">
-                          <list>
-                            <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/gradle-templates/gradle-templates/1.4.1/b5920b448690aca98553e454cba98116abc1928e/gradle-templates-1.4.1.jar" />
-                          </list>
-                        </option>
-                        <option name="path" value="$PROJECT_DIR$" />
-                      </ExternalModuleBuildClasspathPojo>
-                    </value>
-                  </entry>
-                </map>
-              </option>
-              <option name="name" value="lesson2" />
-            </ExternalProjectBuildClasspathPojo>
-          </value>
-        </entry>
-      </map>
-    </option>
     <option name="projectSyncType">
       <map>
         <entry key="$USER_HOME$/IdeaProjects/briefcase" value="PREVIEW" />
-        <entry key="$PROJECT_DIR$" value="RE_IMPORT" />
       </map>
     </option>
   </component>
@@ -573,6 +228,7 @@
         <option value="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/Two.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/JackWang/Sort.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java" />
+        <option value="$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java" />
       </list>
     </option>
   </component>
@@ -583,10 +239,10 @@
     <sorting>DEFINITION_ORDER</sorting>
   </component>
   <component name="ProjectFrameBounds" extendedState="6">
-    <option name="x" value="28" />
-    <option name="y" value="226" />
-    <option name="width" value="1939" />
-    <option name="height" value="1049" />
+    <option name="x" value="27" />
+    <option name="y" value="225" />
+    <option name="width" value="1941" />
+    <option name="height" value="1050" />
   </component>
   <component name="ProjectInspectionProfilesVisibleTreeState">
     <entry key="Project Default">
@@ -610,64 +266,97 @@
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
-      <pane id="Scope" />
+      <pane id="PackagesPane" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
             <path>
               <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
-              <item name="lesson2" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
             </path>
             <path>
               <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
-              <item name="lesson2" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
               <item name="src" type="462c0819:PsiDirectoryNode" />
             </path>
             <path>
               <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
-              <item name="lesson2" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
               <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
             </path>
             <path>
               <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
-              <item name="lesson2" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
               <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
               <item name="java" type="462c0819:PsiDirectoryNode" />
             </path>
             <path>
               <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
-              <item name="lesson2" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
               <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
               <item name="java" type="462c0819:PsiDirectoryNode" />
+              <item name="com" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
+              <item name="java" type="462c0819:PsiDirectoryNode" />
+              <item name="com" type="462c0819:PsiDirectoryNode" />
+              <item name="cxxt" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
+              <item name="java" type="462c0819:PsiDirectoryNode" />
+              <item name="com" type="462c0819:PsiDirectoryNode" />
+              <item name="cxxt" type="462c0819:PsiDirectoryNode" />
+              <item name="huangyz0918" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
+              <item name="java" type="462c0819:PsiDirectoryNode" />
+              <item name="com" type="462c0819:PsiDirectoryNode" />
+              <item name="cxxt" type="462c0819:PsiDirectoryNode" />
+              <item name="huangyz0918" type="462c0819:PsiDirectoryNode" />
               <item name="lesson" type="462c0819:PsiDirectoryNode" />
             </path>
             <path>
               <item name="lesson2" type="b2602c69:ProjectViewProjectNode" />
-              <item name="lesson2" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="lesson2" type="462c0819:PsiDirectoryNode" />
               <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="main" type="8a07ba80:GradleTreeStructureProvider$GradleModuleDirectoryNode" />
+              <item name="main" type="462c0819:PsiDirectoryNode" />
               <item name="java" type="462c0819:PsiDirectoryNode" />
+              <item name="com" type="462c0819:PsiDirectoryNode" />
+              <item name="cxxt" type="462c0819:PsiDirectoryNode" />
+              <item name="huangyz0918" type="462c0819:PsiDirectoryNode" />
               <item name="lesson" type="462c0819:PsiDirectoryNode" />
-              <item name="jackwang" type="462c0819:PsiDirectoryNode" />
+              <item name="lizhi" type="462c0819:PsiDirectoryNode" />
             </path>
           </expand>
           <select />
         </subPane>
       </pane>
-      <pane id="PackagesPane" />
+      <pane id="Scope" />
     </panes>
   </component>
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="false" />
     <property name="aspect.path.notification.shown" value="true" />
-    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1542111248295" />
+    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1542114918822" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$/build.gradle" />
     <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
     <property name="nodejs_npm_path_reset_for_default_project" value="true" />
-    <property name="settings.editor.selected.configurable" value="preferences.sourceCode.Java" />
+    <property name="settings.editor.selected.configurable" value="reference.settingsdialog.project.gradle" />
   </component>
   <component name="RunDashboard">
     <option name="ruleStates">
@@ -772,6 +461,11 @@
       <workItem from="1542093873576" duration="3255000" />
       <workItem from="1542097250937" duration="2453000" />
       <workItem from="1542109564679" duration="1803000" />
+      <workItem from="1542114165021" duration="25000" />
+      <workItem from="1542114239351" duration="137000" />
+      <workItem from="1542114426618" duration="165000" />
+      <workItem from="1542114728370" duration="195000" />
+      <workItem from="1542193631954" duration="165000" />
     </task>
     <task id="LOCAL-00001" summary="实现了冒泡排序法">
       <created>1542110182391</created>
@@ -791,13 +485,13 @@
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="7511000" />
+    <option name="totallyTimeSpent" value="8198000" />
   </component>
   <component name="ToolWindowManager">
-    <frame x="-7" y="-7" width="1550" height="838" extended-state="6" />
+    <frame x="-7" y="-7" width="1295" height="695" extended-state="6" />
     <editor active="true" />
     <layout>
-      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.18632708" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.20210186" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info id="Designer" order="2" />
       <window_info id="Build Variants" order="3" side_tool="true" />
@@ -806,20 +500,19 @@
       <window_info id="Favorites" order="6" side_tool="true" />
       <window_info id="Capture Tool" order="7" />
       <window_info anchor="bottom" id="Message" order="0" />
-      <window_info anchor="bottom" id="Find" order="1" weight="0.32907802" />
+      <window_info active="true" anchor="bottom" id="Find" order="1" visible="true" weight="0.32740214" />
       <window_info anchor="bottom" id="Run" order="2" weight="0.32907802" />
       <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
       <window_info anchor="bottom" id="TODO" order="6" />
-      <window_info anchor="bottom" id="Build" order="7" weight="0.27388534" />
+      <window_info anchor="bottom" id="Build" order="7" visible="true" weight="0.27224198" />
       <window_info anchor="bottom" id="Terminal" order="8" weight="0.3299363" />
       <window_info anchor="bottom" id="CheckStyle" order="9" />
       <window_info anchor="bottom" id="Event Log" order="10" side_tool="true" />
       <window_info anchor="bottom" id="Messages" order="11" weight="0.3299363" />
       <window_info anchor="bottom" id="Database Changes" order="12" show_stripe_button="false" />
       <window_info anchor="bottom" id="Version Control" order="13" show_stripe_button="false" />
-      <window_info anchor="right" id="Coverage" side_tool="true" weight="0.3297587" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
@@ -830,6 +523,7 @@
       <window_info anchor="right" id="Database" order="7" />
       <window_info anchor="right" id="Palette&#9;" order="8" />
       <window_info anchor="right" id="Theme Preview" order="9" />
+      <window_info anchor="right" id="Coverage" order="10" side_tool="true" weight="0.3297587" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -861,17 +555,18 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java" />
     <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/Two.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="60">
+        <state relative-caret-position="57">
           <caret line="3" selection-start-line="3" selection-end-line="6" selection-end-column="3" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="260">
-          <caret line="13" column="41" lean-forward="true" selection-start-line="13" selection-start-column="41" selection-end-line="13" selection-end-column="41" />
+        <state relative-caret-position="209">
+          <caret line="11" column="12" selection-start-line="11" selection-start-column="12" selection-end-line="11" selection-end-column="12" />
         </state>
       </provider>
     </entry>
diff --git a/lesson2/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java b/lesson2/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java
similarity index 61%
rename from lesson2/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java
rename to lesson2/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java
index 96e8359..8f754ed 100644
--- a/lesson2/src/main/java/com/cxxt/huangyz0918/lesson/jackwang/Sort.java
+++ b/lesson2/src/main/java/com/cxxt/huangyz0918/lesson/lizhi/Sort.java
@@ -1,18 +1,16 @@
-package com.cxxt.huangyz0918.lesson.jackwang;
+package com.cxxt.huangyz0918.lesson.lizhi;
 
 /**
- * @author jackwang
- *     Created: Tue Nov 13 15:21:29 CST 2018
- */
+ * @author lizhi
+ * */
 
 public class Sort {
-
     public static void main(String[] args) {
-//        int[] arr = {1, 2, 3, 8, 6, 4, 5, 7, 9};
-//        sort(arr);
-//        for (int i = 0; i < arr.length; i++) {
-//            System.out.println(arr[i]);
-//        }
+        //int[] arr = {1, 2, 3, 8, 6, 4, 5, 7, 9};
+        //sort(arr);
+        //for (int i = 0; i < arr.length; i++) {
+          //  System.out.println(arr[i]);
+        }
     }
 
     public static void sort(int[] arr) {
@@ -27,6 +25,4 @@ public static void sort(int[] arr) {
             }
         }
     }
-
 }
-