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Snailclimb merged 1 commit into from
Aug 21, 2019
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Update Java内存区域.md #448

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3 changes: 2 additions & 1 deletion docs/java/jvm/Java内存区域.md
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Expand Up @@ -294,7 +294,7 @@ System.out.println(str2==str3);//false
**String 类型的常量池比较特殊。它的主要使用方法有两种：**

- 直接使用双引号声明出来的 String 对象会直接存储在常量池中。
- 如果不是用双引号声明的 String 对象，可以使用 String 提供的 intern 方法。String.intern() 是一个 Native 方法，它的作用是：如果运行时常量池中已经包含一个等于此 String 对象内容的字符串，则返回常量池中该字符串的引用；如果没有，则在常量池中创建与此 String 内容相同的字符串，并返回常量池中创建的字符串的引用。
- 如果不是用双引号声明的 String 对象，可以使用 String 提供的 intern 方法。String.intern() 是一个 Native 方法，它的作用是：如果运行时常量池中已经包含一个等于此 String 对象内容的字符串，则返回常量池中该字符串的引用；如果没有，JDK1.7之前（不包含1.7）的处理方式是在常量池中创建与此 String 内容相同的字符串，并返回常量池中创建的字符串的引用，JDK1.7以及之后的处理方式是在常量池中记录此字符串的引用，并返回该引用。

```java
String s1 = new String("计算机");
Expand Down Expand Up @@ -421,6 +421,7 @@ i4=i5+i6 true
- <http://www.pointsoftware.ch/en/under-the-hood-runtime-data-areas-javas-memory-model/>
- <https://dzone.com/articles/jvm-permgen-%E2%80%93-where-art-thou>
- <https://stackoverflow.com/questions/9095748/method-area-and-permgen>
- 深入解析String#intern<https://tech.meituan.com/2014/03/06/in-depth-understanding-string-intern.html>

## 公众号

Expand Down