This article describes the usage of Java ThreadLocal with examples. Share with you for your reference, as follows:

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ThreadLocal implements thread local variables in Java. The so-called thread local variables are some unique data stored in each thread. We know that all threads in a process share the resources of the process. The modification of resources by a thread will be reflected on other threads in the process. If we hope that the modification of resources by a thread will not affect other threads, Then you need to set the resource as a thread local variable.

Basic use of ThreadLocal

Implementation principle of ThreadLocal

Source code analysis (based on openjdk11)

Get method:

Setinitialvalue method

Getentry method

Set method

Set method of threadlocalmap

Replacestateentry method

Cleansomeslots method

Rehash method

Resize method