
可是我不明白的是为什么那个数据结构是个map 呢? : 允许将多个线程变量放到map中.
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ThreadLocal<String> threadLocalA= new ThreadLocal<String>();
线程1: threadLocalA.set("1234"); 线程2: threadLocalA.set("5678");
ThreadLocal<Integer> threadLocalB = new ThreadLocal<Integer>();
线程1: threadLocalB.set(30); 线程2: threadLocalB.set(40);
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