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Update 设计模式 - 享元.md
小节标题改为中文,重新绘制类图,补充参考资料。
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## 享元(Flyweight)
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### Intent
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### 意图
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利用共享的方式来支持大量细粒度的对象,这些对象一部分内部状态是相同的。
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### Class Diagram
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### 类图
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- Flyweight:享元对象
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- IntrinsicState:内部状态,享元对象共享内部状态
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- ExtrinsicState:外部状态,每个享元对象的外部状态不同
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/5f5c22d5-9c0e-49e1-b5b0-6cc7032724d4.png"/> </div><br>
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### Implementation
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<div align="center"> <img src="pics/dp-flyweight.png" width="760px"/> </div><br>
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### 实现
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```java
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public interface Flyweight {
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void doOperation(String extrinsicState);
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}
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```
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```html
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```text
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Object address: 1163157884
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IntrinsicState: aa
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ExtrinsicState: x
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ExtrinsicState: y
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```
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### JDK
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### JDK 中的应用
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Java 利用缓存来加速大量小对象的访问时间。
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- java.lang.Integer#valueOf(int)
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- java.lang.Boolean#valueOf(boolean)
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- java.lang.Byte#valueOf(byte)
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- java.lang.Character#valueOf(char)
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## 参考资料
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- 弗里曼. Head First 设计模式 [M]. 中国电力出版社, 2007.
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- Gamma E. 设计模式: 可复用面向对象软件的基础 [M]. 机械工业出版社, 2007.
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