How to use ThreadLocal in java

This article mainly explains "how to use ThreadLocal in java". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use ThreadLocal in java.

We know that variable sharing can be achieved with the static keyword in Java, so in a multithreaded environment, you can use ThreadLocal to make each thread have its own private data. First, let's take a look at an example of a shared variable.

We see that because the count variable is a shared variable, the same count instance variable is manipulated in both threads, so the second thread outputs 2 when it is output. Let's create a ThreadLocal variable to see how it works.

We see that the output of localCount is 1, which is determined by the characteristics of ThreadLocal. Each thread has its own copy of the data decorated with ThreadLocal, so when thread 1 set () the ThreadLocal data, thread 2's ThreadLocal data is still empty. So each operation is its own, so the output is 1. In the actual multithreaded development, ThreadLocal is often used to solve the situation of dealing with different businesses with the same data. Because they don't affect each other.

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