增加demo

.idea/workspace.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="e43e9168-5945-4f45-b4c2-1b6410d1eef8" name="Changes" comment="增加策略模式案例&#10;Signed-off-by: chenjianqiang &lt;wushanxi@gmail.com&gt;" />
+    <list default="true" id="e43e9168-5945-4f45-b4c2-1b6410d1eef8" name="Changes" comment="增加策略模式案例&#10;Signed-off-by: chenjianqiang &lt;wushanxi@gmail.com&gt;">
+      <change beforePath="$PROJECT_DIR$/out/production/patterns/com/pattern/PatternApplication.class" beforeDir="false" afterPath="$PROJECT_DIR$/out/production/patterns/com/pattern/PatternApplication.class" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/com/pattern/PatternApplication.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/com/pattern/PatternApplication.java" afterDir="false" />
+    </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -14,8 +17,8 @@
     <option name="RECENT_TEMPLATES">
       <list>
         <option value="package-info" />
-        <option value="Class" />
         <option value="Interface" />
+        <option value="Class" />
       </list>
     </option>
   </component>
@@ -88,17 +91,17 @@
   </component>
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$/src/com/pattern/FactoryPattern/AbstractFactory/materials" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/src/com/pattern" />
     <property name="settings.editor.selected.configurable" value="editor.preferences.import" />
     <property name="vue.rearranger.settings.migration" value="true" />
   </component>
   <component name="RecentsManager">
     <key name="CopyFile.RECENT_KEYS">
+      <recent name="E:\chen\patterns\src\com\pattern" />
+      <recent name="E:\chen\patterns\src\com\pattern\demo\materials" />
+      <recent name="E:\chen\patterns\src\com\pattern\demo\examples" />
       <recent name="E:\chen\patterns\src\com\pattern\FactoryPattern\AbstractFactory\materials" />
       <recent name="E:\chen\patterns\src\com\pattern\FactoryPattern\AbstractFactory" />
-      <recent name="E:\chen\patterns\src\com\pattern\FactoryPattern\FunctionFactory" />
-      <recent name="E:\chen\patterns\src\com\pattern\FactoryPattern\SimpleFactory\examples" />
-      <recent name="E:\chen\patterns\src\com\pattern\InterpreterPattern\examples" />
     </key>
     <key name="MoveClassesOrPackagesDialog.RECENTS_KEY">
       <recent name="com.pattern.demo" />
@@ -111,7 +114,7 @@
       <recent name="com.pattern.FactoryPattern.FunctionFactory" />
     </key>
   </component>
-  <component name="RunManager" selected="HTTP Request.generated-requests#2">
+  <component name="RunManager" selected="Application.PatternApplication">
     <configuration name="PatternApplication" type="Application" factoryName="Application" temporary="true">
       <option name="MAIN_CLASS_NAME" value="com.pattern.PatternApplication" />
       <module name="patterns" />
@@ -130,8 +133,8 @@
     </list>
     <recent_temporary>
       <list>
-        <item itemvalue="HTTP Request.generated-requests#2" />
         <item itemvalue="Application.PatternApplication" />
+        <item itemvalue="HTTP Request.generated-requests#2" />
       </list>
     </recent_temporary>
   </component>
@@ -148,7 +151,7 @@
       <workItem from="1634085227295" duration="1967000" />
       <workItem from="1634087918450" duration="3646000" />
       <workItem from="1634091679401" duration="1323000" />
-      <workItem from="1634093719115" duration="13904000" />
+      <workItem from="1634093719115" duration="14778000" />
     </task>
     <task id="LOCAL-00001" summary="增加策略模式案例&#10;Signed-off-by: chenjianqiang &lt;wushanxi@gmail.com&gt;">
       <created>1634096220780</created>

src/com/pattern/PatternApplication.java

 package com.pattern;
 
-import com.pattern.FactoryPattern.AbstractFactory.materials.AbstractFactoryMain;
+import com.pattern.SingletonPattern.SingleMain;
 
 /**
  * @author lx
@@ -20,7 +20,10 @@ public class PatternApplication {
         //工厂模式 -- 方法工厂
         //new FunctionFactoryMain().main();
         //工厂模式 -- 抽象工厂
-        new AbstractFactoryMain().main();
+        //new AbstractFactoryMain().main();
+
+        //单例模式
+        new SingleMain().main();
     }
 
 }

src/com/pattern/SingletonPattern/SingleMain.java

+package com.pattern.SingletonPattern;
+
+import com.pattern.SingletonPattern.materials.SingleObject;
+
+/**
+ * @author lx
+ * @date 2021/10/13 16:55
+ **/
+public class SingleMain {
+
+    public void main() {
+
+        System.err.println(SingleObject.getInstance().getName());
+    }
+}

src/com/pattern/SingletonPattern/materials/SingleObject.java

+package com.pattern.SingletonPattern.materials;
+
+/**
+ * 饿汉式
+ *
+ * @author lx
+ * @date 2021/10/13 16:50
+ **/
+public class SingleObject {
+
+    private static final SingleObject SINGLE_OBJECT = new SingleObject();
+
+    private SingleObject() {
+    }
+
+    public static SingleObject getInstance() {
+        return SINGLE_OBJECT;
+    }
+
+    public String getName() {
+        return "SingleObject";
+    }
+}