diff --git a/model/10-10类设计模型/类设计模型.png b/model/10-10类设计模型/类设计模型.png
index 199f08e..89dc9f7 100644
Binary files a/model/10-10类设计模型/类设计模型.png and b/model/10-10类设计模型/类设计模型.png differ
diff --git a/src/demo/.idea/.gitignore b/src/demo/.idea/.gitignore
new file mode 100644
index 0000000..13566b8
--- /dev/null
+++ b/src/demo/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/src/demo/.idea/compiler.xml b/src/demo/.idea/compiler.xml
new file mode 100644
index 0000000..07e72e7
--- /dev/null
+++ b/src/demo/.idea/compiler.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="demo" />
+      </profile>
+    </annotationProcessing>
+  </component>
+  <component name="JavacSettings">
+    <option name="ADDITIONAL_OPTIONS_OVERRIDE">
+      <module name="demo" options="-parameters" />
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/.idea/encodings.xml b/src/demo/.idea/encodings.xml
new file mode 100644
index 0000000..63e9001
--- /dev/null
+++ b/src/demo/.idea/encodings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/.idea/jarRepositories.xml b/src/demo/.idea/jarRepositories.xml
new file mode 100644
index 0000000..712ab9d
--- /dev/null
+++ b/src/demo/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <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>
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/.idea/misc.xml b/src/demo/.idea/misc.xml
new file mode 100644
index 0000000..d5cd614
--- /dev/null
+++ b/src/demo/.idea/misc.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK" />
+</project>
\ No newline at end of file
diff --git a/src/demo/.idea/vcs.xml b/src/demo/.idea/vcs.xml
new file mode 100644
index 0000000..b2bdec2
--- /dev/null
+++ b/src/demo/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/src/.idea/misc.xml b/src/demo/src/.idea/misc.xml
new file mode 100644
index 0000000..639900d
--- /dev/null
+++ b/src/demo/src/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/src/.idea/modules.xml b/src/demo/src/.idea/modules.xml
new file mode 100644
index 0000000..31eaf94
--- /dev/null
+++ b/src/demo/src/.idea/modules.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/main/main.iml" filepath="$PROJECT_DIR$/main/main.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/src.iml" filepath="$PROJECT_DIR$/.idea/src.iml" />
+      <module fileurl="file://$PROJECT_DIR$/test/test.iml" filepath="$PROJECT_DIR$/test/test.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/src/.idea/src.iml b/src/demo/src/.idea/src.iml
new file mode 100644
index 0000000..d6ebd48
--- /dev/null
+++ b/src/demo/src/.idea/src.iml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/demo/src/.idea/vcs.xml b/src/demo/src/.idea/vcs.xml
new file mode 100644
index 0000000..c2365ab
--- /dev/null
+++ b/src/demo/src/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/src/.idea/workspace.xml b/src/demo/src/.idea/workspace.xml
new file mode 100644
index 0000000..31fccbe
--- /dev/null
+++ b/src/demo/src/.idea/workspace.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="05c0847c-1ade-4f8d-8ae8-96ec4430ad3f" name="Changes" comment="" />
+    <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="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/../../.." />
+  </component>
+  <component name="MarkdownSettingsMigration">
+    <option name="stateVersion" value="1" />
+  </component>
+  <component name="ProjectId" id="2FyZKjYSvdkuwvjXwxI9ddv3vVv" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <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" />
+  </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">
+      <changelist id="05c0847c-1ade-4f8d-8ae8-96ec4430ad3f" name="Changes" comment="" />
+      <created>1665466222251</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1665466222251</updated>
+      <workItem from="1665466223429" duration="78000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="3" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/demo/src/main/main.iml b/src/demo/src/main/main.iml
new file mode 100644
index 0000000..908ad4f
--- /dev/null
+++ b/src/demo/src/main/main.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/java" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/demo/src/test/test.iml b/src/demo/src/test/test.iml
new file mode 100644
index 0000000..a0e49a3
--- /dev/null
+++ b/src/demo/src/test/test.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/java" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file