From 41595084b6b384de31f33bddf3991f2c6ede4298 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=E5=98=89=E9=98=B3?= <fjy8018@qq.com>
Date: Mon, 24 Sep 2018 15:44:48 +0800
Subject: [PATCH] =?UTF-8?q?=E9=A5=BF=E6=B1=89=E5=BC=8F=E5=8D=95=E4=BE=8B?=
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---
 .../creational/singleton/HungrySingleton.java | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/main/java/top/fjy8018/designpattern/pattern/creational/singleton/HungrySingleton.java

diff --git a/src/main/java/top/fjy8018/designpattern/pattern/creational/singleton/HungrySingleton.java b/src/main/java/top/fjy8018/designpattern/pattern/creational/singleton/HungrySingleton.java
new file mode 100644
index 0000000..4c3f5f0
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/pattern/creational/singleton/HungrySingleton.java
@@ -0,0 +1,28 @@
+package top.fjy8018.designpattern.pattern.creational.singleton;
+
+/**
+ * 单例模式：饿汉式（类加载时初始化）
+ * 优点：写法简单，类加载时初始化，线程安全
+ * 缺点：若类不被使用则会造成内存浪费
+ *
+ * @author F嘉阳
+ * @date 2018-09-24 15:38
+ */
+public class HungrySingleton {
+    /**
+     * 类加载时初始化
+     * 声明final（可选），只有在类加载时初始化才能声明为final，故懒汉式不能声明为final
+     */
+    private static final HungrySingleton HUNGRYSINGLETON;
+
+    static {
+        HUNGRYSINGLETON = new HungrySingleton();
+    }
+
+    private HungrySingleton() {
+    }
+
+    public static HungrySingleton getInstance() {
+        return HUNGRYSINGLETON;
+    }
+}