diff --git a/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java b/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java
index 964ea08..7e94b9e 100644
--- a/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java
+++ b/src/main/java/top/fjy8018/designpattern/pattern/behavior/strategy/PromotionStrategyFactory.java
@@ -1,10 +1,30 @@
 package top.fjy8018.designpattern.pattern.behavior.strategy;
 
+import org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory;
+import org.springframework.beans.factory.support.CglibSubclassingInstantiationStrategy;
+import org.springframework.beans.factory.support.SimpleInstantiationStrategy;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.PathResource;
+
+import java.util.Arrays;
+import java.util.Comparator;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * 促销策略工厂
+ * <p>
+ * {@link java.util.Comparator} 比较器，类似于抽象策略，有大量实现类，所有具体策略都要实现定义好的接口方法
+ * 例如 {@link com.google.common.collect.ExplicitOrdering}
+ * 应用层可以逐级传递比较器 {@link Arrays#sort(Object[], Comparator)}
+ * {@link java.util.TreeMap#compare(Object, Object)} 利用内部的比较器处理
+ * <p>
+ * Spring资源策略抽象 {@link org.springframework.core.io.Resource}
+ * 提供大量策略实现 {@link PathResource} {@link FileSystemResource}
+ * <p>
+ * {@link org.springframework.beans.factory.support.InstantiationStrategy} 初始化策略接口
+ * 初始化具体策略实现 {@link SimpleInstantiationStrategy} {@link CglibSubclassingInstantiationStrategy}
+ * 初始化策略在 {@link AbstractAutowireCapableBeanFactory} 中被使用
  *
  * @author F嘉阳
  * @date 2020/3/4 16:09