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What is the use of ThreadLocal class?

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Pragya Keshap answered on February 4, 2023 Popularity 8/10 Helpfulness 2/10

answer What is the use of ThreadLocal class?

What is the use of ThreadLocal class?

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ThreadLocal class provides thread-local variables. Each thread

accesses only its own local variables. It has its own copy of the

variable.

By using ThreadLocal, if thread X stores a variable with value x

and another thread Y stores same variable with the value y, then X

gets x from its ThreadLocal instance and Y gets y from its

ThreadLocal instance.

Typically, ThreadLocal instances are private static fields that are

associated with the state of a thread

class RunnableDemo implements Runnable {
   int counter;
   ThreadLocal<Integer> threadLocalCounter = new ThreadLocal<Integer>();

   public void run() {     
      counter++;

      if(threadLocalCounter.get() != null) {
         threadLocalCounter.set(threadLocalCounter.get().intValue() + 1);
      } else {
         threadLocalCounter.set(0);
      }
      System.out.println("Counter: " + counter);
      System.out.println("threadLocalCounter: " + threadLocalCounter.get());
   }
}

public class TestThread {

   public static void main(String args[]) {
      RunnableDemo commonInstance = new RunnableDemo();

      Thread t1 = new Thread(commonInstance);
      Thread t2 = new Thread(commonInstance);
      Thread t3 = new Thread(commonInstance);
      Thread t4 = new Thread(commonInstance);

      t1.start();
      t2.start();
      t3.start();
      t4.start();

      // wait for threads to end
      try {
         t1.join();
         t2.join();
         t3.join();
         t4.join();
      } catch (Exception e) {
         System.out.println("Interrupted");
      }
   }
}

https://www.tutorialspoint.com/java_concurrency/concurrency_threadlocal.htm#:~:text=The%20ThreadLocal%20class%20is%20used,variable%20done%20by%20other%20thread.

Popularity 8/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

What is the use of ThreadLocal class?

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