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Update java-concurrent-questions-02.md

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docs/java/concurrent/java-concurrent-questions-02.md
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@ -457,9 +457,12 @@ public class Thread implements Runnable {
```java ```java
public void set(T value) { public void set(T value) {
//获取当前请求的线程
Thread t = Thread.currentThread(); Thread t = Thread.currentThread();
//取出 Thread 类内部的 threadLocals 变量(哈希表结构)
ThreadLocalMap map = getMap(t); ThreadLocalMap map = getMap(t);
if (map != null) if (map != null)
// 将需要存储的值放入到这个哈希表中
map.set(this, value); map.set(this, value);
else else
createMap(t, value); createMap(t, value);