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Update Java基础知识.md

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shuang.kou 2020-05-25 00:07:21 +08:00
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@ -408,7 +408,7 @@ Java**中**有8种基本数据类型，分别为：
更多内容见：[深入剖析 Java 中的装箱和拆箱](https://www.cnblogs.com/dolphin0520/p/3780005.html)
#### 1.3.3. 种基本类型的包装类和常量池
#### 1.3.3. 8种基本类型的包装类和常量池
**Java 基本类型的包装类的大部分都实现了常量池技术，即 Byte,Short,Integer,Long,Character,Boolean；前面 4 种包装类默认创建了数值[-128，127] 的相应类型的缓存数据，Character创建了数值在[0,127]范围的缓存数据，Boolean 直接返回True Or False。如果超出对应范围仍然会去创建新的对象。** 为啥把缓存设置为[-128，127]区间？（[参见issue/461](https://github.com/Snailclimb/JavaGuide/issues/461)）性能和资源之间的权衡。