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Regarding ThreadLocal, many students may have heard of it when learning the concurrent programming part of Java, but if you ask in detail what ThreadLocal is, we may not be able to explain it clearly, so this blog aims to help everyone understand what ThreadLocal is?

1.What is ThreadLocal?

First of all, we need to know that the ThreadLocal class is located in the java.lang package of the Java standard library. It is a class in Java that we can use to declare a ThreadLocal variable as follows:

ThreadLocal local = new ThreadLocal