diff --git a/Java源代码/lesson04/.idea/.gitignore b/Java源代码/lesson04/.idea/.gitignore
new file mode 100644
index 00000000..0a8642fa
--- /dev/null
+++ b/Java源代码/lesson04/.idea/.gitignore
@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Zeppelin ignored files
+/ZeppelinRemoteNotebooks/
diff --git a/Java源代码/lesson04/.idea/inspectionProfiles/Project_Default.xml b/Java源代码/lesson04/.idea/inspectionProfiles/Project_Default.xml
new file mode 100644
index 00000000..c6bd9f3d
--- /dev/null
+++ b/Java源代码/lesson04/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,33 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="IncorrectHttpHeaderInspection" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="customHeaders">
+        <set>
+          <option value="SOFA-Tenant" />
+          <option value="DRM-PushMode" />
+          <option value="DRM-DataFormat" />
+          <option value="DRM-Zones" />
+          <option value="DRM-Ips" />
+          <option value="DRM-Profiles" />
+          <option value="RPC-Url" />
+          <option value="RPC-UniqueId" />
+          <option value="RPC-SofaContext" />
+          <option value="RPC-SofaGroup" />
+          <option value="Scheduler-JobRunMode" />
+          <option value="Scheduler-Zone" />
+          <option value="Scheduler-JobAppName" />
+          <option value="MsgBroker-Type" />
+          <option value="MsgBroker-Zone" />
+          <option value="MsgBroker-PayloadClazz" />
+          <option value="MsgBroker-GroupId" />
+          <option value="MsgBroker-Dependencies" />
+          <option value="MsgBroker-Properties" />
+          <option value="MsgBroker-TargetNode" />
+          <option value="MsgBroker-ZoneUid" />
+          <option value="MsgBroker-DevGroup" />
+        </set>
+      </option>
+    </inspection_tool>
+  </profile>
+</component>
\ No newline at end of file
diff --git a/Java源代码/lesson04/.idea/lesson04.iml b/Java源代码/lesson04/.idea/lesson04.iml
new file mode 100644
index 00000000..d6ebd480
--- /dev/null
+++ b/Java源代码/lesson04/.idea/lesson04.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/Java源代码/lesson04/.idea/modules.xml b/Java源代码/lesson04/.idea/modules.xml
new file mode 100644
index 00000000..8b84b507
--- /dev/null
+++ b/Java源代码/lesson04/.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/lesson04.iml" filepath="$PROJECT_DIR$/.idea/lesson04.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Java源代码/lesson04/.idea/vcs.xml b/Java源代码/lesson04/.idea/vcs.xml
new file mode 100644
index 00000000..b2bdec2d
--- /dev/null
+++ b/Java源代码/lesson04/.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/Java源代码/lesson04/demo01/src/main/java/com/ykl/App02.java b/Java源代码/lesson04/demo01/src/main/java/com/ykl/App02.java
new file mode 100644
index 00000000..76c375a0
--- /dev/null
+++ b/Java源代码/lesson04/demo01/src/main/java/com/ykl/App02.java
@@ -0,0 +1,19 @@
+package com.ykl.example01;
+
+/**
+ * Hello world!
+ *
+ */
+public class App02
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello World!" );
+        Dog dd = new Dog();
+        Animal ad = new Dog();
+        dd.say();
+        dd.eat();
+        ad.say();
+        ad.eat();
+    }
+}
diff --git a/Java源代码/lesson04/demo01/src/main/java/com/ykl/example01/Person.java b/Java源代码/lesson04/demo01/src/main/java/com/ykl/example01/Person.java
new file mode 100644
index 00000000..426c655e
--- /dev/null
+++ b/Java源代码/lesson04/demo01/src/main/java/com/ykl/example01/Person.java
@@ -0,0 +1,9 @@
+/**
+ * Alipay.com Inc.
+ * Copyright (c) 2004-2022 All Rights Reserved.
+ */package com.ykl.example01;/**
+ *
+ * @author yinkanglong
+ * @version : Person, v 0.1 2022-07-24 01:56 yinkanglong Exp $
+ */public class Person {
+}