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+++ b/docs/notes/Java 虚拟机.md
@@ -31,7 +31,7 @@
# 一、运行时数据区域
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+
## 程序计数器
@@ -41,7 +41,7 @@
每个 Java 方法在执行的同时会创建一个栈帧用于存储局部变量表、操作数栈、常量池引用等信息。从方法调用直至执行完成的过程，就对应着一个栈帧在 Java 虚拟机栈中入栈和出栈的过程。
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+
可以通过 -Xss 这个虚拟机参数来指定每个线程的 Java 虚拟机栈内存大小：
@@ -60,8 +60,7 @@ java -Xss512M HackTheJava
本地方法一般是用其它语言（C、C++ 或汇编语言等）编写的，并且被编译为基于本机硬件和操作系统的程序，对待这些方法需要特别处理。
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-
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## 堆
@@ -141,7 +140,7 @@ Java 虚拟机使用该算法来判断对象是否可被回收，在 Java 中 GC
- 方法区中类静态属性引用的对象
- 方法区中的常量引用的对象
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+
### 3. 方法区的回收
@@ -221,7 +220,7 @@ obj = null;
### 1. 标记 - 清除
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标记要回收的对象，然后清除。
@@ -232,13 +231,13 @@ obj = null;
### 2. 标记 - 整理
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+
让所有存活的对象都向一端移动，然后直接清理掉端边界以外的内存。
### 3. 复制
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将内存划分为大小相等的两块，每次只使用其中一块，当这一块内存用完了就将还存活的对象复制到另一块上面，然后再把使用过的内存空间进行一次清理。
@@ -440,7 +439,7 @@ G1 把堆划分成多个大小相等的独立区域（Region），新生代和
## 类的生命周期
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包括以下 7 个阶段：
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