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Correct the description of GC. #26

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Correct the description of GC. #26

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14 changes: 8 additions & 6 deletions README.md
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Expand Up @@ -161,12 +161,14 @@
- 垃圾收集器是什么?它是如何工作的

- 所有的对象实例都在JVM管理的堆区域分配内存

只要对象被引用，JVM就会认为它还存活于进程中。

一旦对象不再被引用，就不能被应用程序所访问，

垃圾收集器将删除它并重新声明未使用的内存。

现在一般采用[根搜索算法](http://wiki.jikexueyuan.com/project/java-vm/garbage-collection-mechanism.html)来判断对象是否存活,

而不是使用计算被引用次数的方式(它很难解决对象之间的相互循环引用的问题).

对于根搜索算法无法到达的对象,

垃圾收集器对它会进行标记,在下一次GC时,会被回收并重新声明未使用的内存

- 比较 `Arrays` 和 `ArrayLists`。

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