增加单例饿汉模式，懒汉模式

.idea/workspace.xml

@@ -3,7 +3,6 @@
   <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;">
       <change beforePath="$PROJECT_DIR$/src/com/pattern/SingletonPattern/SingleMain.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/com/pattern/SingletonPattern/SingleMain.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/com/pattern/SingletonPattern/materials/SingleObject.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/com/pattern/SingletonPattern/materials/HungrySingleObject.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -93,6 +92,7 @@
     <property name="WebServerToolWindowFactoryState" value="false" />
     <property name="last_opened_file_path" value="$PROJECT_DIR$/src/com/pattern" />
     <property name="settings.editor.selected.configurable" value="editor.preferences.import" />
+    <property name="typescript.add.unambiguous.imports.on.the.fly" value="true" />
     <property name="vue.rearranger.settings.migration" value="true" />
   </component>
   <component name="RecentsManager">
@@ -107,11 +107,11 @@
       <recent name="com.pattern.demo" />
     </key>
     <key name="CopyClassDialog.RECENTS_KEY">
+      <recent name="com.pattern.SingletonPattern.materials" />
       <recent name="com.pattern.FactoryPattern.AbstractFactory.materials.factory" />
       <recent name="com.pattern.FactoryPattern.FunctionFactory.materials.factory" />
       <recent name="com.pattern.FactoryPattern.FunctionFactory.materials.po" />
       <recent name="com.pattern.FactoryPattern.AbstractFactory.materials" />
-      <recent name="com.pattern.FactoryPattern.FunctionFactory" />
     </key>
   </component>
   <component name="RunManager" selected="Application.PatternApplication">
@@ -153,6 +153,7 @@
       <workItem from="1634091679401" duration="1323000" />
       <workItem from="1634093719115" duration="14778000" />
       <workItem from="1634115899707" duration="377000" />
+      <workItem from="1634180031509" duration="574000" />
     </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/SingletonPattern/SingleMain.java

 package com.pattern.SingletonPattern;
 
 import com.pattern.SingletonPattern.materials.HungrySingleObject;
+import com.pattern.SingletonPattern.materials.LazySingleObject;
 
 /**
+ * 单例模式
+ *
  * @author lx
  * @date 2021/10/13 16:55
  **/
@@ -10,6 +13,11 @@ public class SingleMain {
 
     public void main() {
 
-        System.err.println(HungrySingleObject.getInstance().getName());
+        System.err.println("饿了：" + HungrySingleObject.getInstance().getName());
+
+        System.err.println("累了：" + LazySingleObject.getInstance().getName());
+
+        System.err.println("喝某某特饮！");
     }
+
 }

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

@@ -18,6 +18,6 @@ public class HungrySingleObject {
     }
 
     public String getName() {
-        return "SingleObject";
+        return "HungrySingleObject";
     }
 }

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

+package com.pattern.SingletonPattern.materials;
+
+/**
+ * 懒汉式  ：  什么时候要了，我先去找找，没有就去制作
+ *
+ * @author lx
+ * @date 2021/10/13 16:50
+ **/
+public class LazySingleObject {
+
+    private static LazySingleObject SINGLE_OBJECT;
+
+    private LazySingleObject() {
+    }
+
+    public static LazySingleObject getInstance() {
+        if (SINGLE_OBJECT == null) {
+            return SINGLE_OBJECT = new LazySingleObject();
+        }
+        return SINGLE_OBJECT;
+    }
+
+    public String getName() {
+        return "LazySingleObject";
+    }
+}