AtomicReference weakCompareAndSetAcquire() method in Java with Examples

The weakCompareAndSetAcquire() method of a AtomicReference class is used to atomically sets the value to newValue for AtomicReference if the current value is equal to expectedValue passed as parameter. This method updates the value with memeory ordering effects compatible with memory_order_acquire ordering.This method returns true if set a new value to AtomicRefrence is successful.

Syntax:

public final boolean
 weakCompareAndSetAcquire(V expectedValue,
                          V newValue)

Parameters: This method accepts expectedValue which is the expected value and newValue which is the new value to set.

Return value: This method returns true if successful.

Below programs illustrate the weakCompareAndSetAcquire() method:
Program 1:



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// Java program to demonstrate
// AtomicReference.weakCompareAndSetAcquire() method
  
import java.util.concurrent.atomic.AtomicReference;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an atomic reference object
        // which stores Integer.
        AtomicReference<Long> ref
            = new AtomicReference<Long>();
  
        // set some value
        ref.set(11111111L);
  
        // apply weakCompareAndSetAcquire()
        boolean result
            = ref.weakCompareAndSetAcquire(
                1111111111111L,
                999999L);
  
        // print value
        System.out.println("Setting new value"
                           + " is successful = "
                           + result);
        System.out.println("Value = " + ref.get());
    }
}

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Output:

Program 2:

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// Java program to demonstrate
// AtomicReference.weakCompareAndSetAcquire() method
  
import java.util.concurrent.atomic.AtomicReference;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an atomic reference object
        // which stores String.
        AtomicReference<String> ref
            = new AtomicReference<String>();
  
        // set some value
        ref.set("WELCOME TO GEEKS FOR GEEKS");
  
        // apply weakCompareAndSetAcquire()
        boolean result
            = ref.weakCompareAndSetAcquire(
                "WELCOME TO GEEKS FOR GEEKS",
                "WELCOLME GEEKS");
  
        // print value
        System.out.println("Setting new value"
                           + " is successful = "
                           + result);
        System.out.println("Value  = " + ref.get());
    }
}

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Output:

References: https://docs.oracle.com/javase/10/docs/api/java/util/concurrent/atomic/AtomicReference.html#weakCompareAndSetAcquire(V, V)

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