Java ThreadLocal Class

Introduction

The Java ThreadLocal class provides thread-local variables.

Class Declaration

Following is the declaration for java.lang.ThreadLocal class −

public class ThreadLocal<T>
   extends Object

Class constructors

Sr.No.	Constructor & Description
1	ThreadLocal() This creates a thread local variable.

Class methods

Sr.No.	Method & Description
1	T get() This method returns the value in the current thread's copy of this thread-local variable.
2	protected T initialValue() This method returns the current thread's "initial value" for this thread-local variable.
3	void remove() This method removes the current thread's value for this thread-local variable.
4	void set(T value) This method sets the current thread's copy of this thread-local variable to the specified value.

Methods inherited

This class inherits methods from the following classes −

java.lang.Object

Example: Getting a Value from ThreadLocal Object

The following example shows the usage of Java ThreadLocal get() method. In this program, we've initialized a ThreadLocal object. Using set() method, a value is assigned to ThreadLocal object and using get() method, value is retrieved and printed.

package com.tutorialspoint;

public class ThreadLocalDemo {

   public static void main(String[] args) {

      ThreadLocal<Integer> tlocal = new ThreadLocal<Integer>();  

      tlocal.set(100);
      // returns the current thread's value
      System.out.println("value = " + tlocal.get());
 
      tlocal.set(90);
      // returns the current thread's value of 
      System.out.println("value = " + tlocal.get());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

value = 100
value = 90

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