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Merge pull request #626 from PualrDwade/patch-2

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Update Java 虚拟机.md
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CyC2018 2019-03-21 22:07:26 +08:00 committed by GitHub
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@ -122,10 +122,15 @@ public class Test {
Test b = new Test(); Test b = new Test();
a.instance = b; a.instance = b;
b.instance = a; b.instance = a;
a = null;
b = null;
doSomething();
} }
} }
``` ```
在上述代码中,a与b引用的对象实例互相持有了对象的引用,因此当我们把对a对象与b对象的引用去除之后,由于两个对象还存在互相之间的引用,导致两个Test对象无法被回收。
### 2. 可达性分析算法 ### 2. 可达性分析算法
以 GC Roots 为起始点进行搜索，可达的对象都是存活的，不可达的对象可被回收。 以 GC Roots 为起始点进行搜索，可达的对象都是存活的，不可达的对象可被回收。