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fix typo #8

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fix typo #8

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2 changes: 1 addition & 1 deletion docs/java/java-concurrent.md
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Expand Up @@ -808,7 +808,7 @@ public class ThreadLocalDemo {

### ThreadLocal内存泄漏的原因？

每个线程都有⼀个`ThreadLocalMap`的内部属性，map的key是`ThreaLocal`，定义为弱引用，value是强引用类型。垃圾回收的时候会⾃动回收key，而value的回收取决于Thread对象的生命周期。一般会通过线程池的方式复用线程节省资源，这也就导致了线程对象的生命周期比较长，这样便一直存在一条强引用链的关系：`Thread` --> `ThreadLocalMap`-->`Entry`-->`Value`，随着任务的执行，value就有可能越来越多且无法释放，最终导致内存泄漏。
每个线程都有⼀个`ThreadLocalMap`的内部属性，map的key是`ThreadLocal`，定义为弱引用，value是强引用类型。垃圾回收的时候会⾃动回收key，而value的回收取决于Thread对象的生命周期。一般会通过线程池的方式复用线程节省资源，这也就导致了线程对象的生命周期比较长，这样便一直存在一条强引用链的关系：`Thread` --> `ThreadLocalMap`-->`Entry`-->`Value`，随着任务的执行，value就有可能越来越多且无法释放，最终导致内存泄漏。

解决⽅法：每次使⽤完`ThreadLocal`就调⽤它的`remove()`⽅法，手动将对应的键值对删除，从⽽避免内存泄漏。

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