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AtomicReferenceArray weakCompareAndSetRelease() method in Java with Examples

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  • Last Updated : 03 Jan, 2020

The weakCompareAndSetRelease() method of a AtomicReferenceArray class is used to atomically sets the value of the element at index i to newValue to newValue for AtomicReferenceArray if the current value is equal to expectedValue passed as parameter. This method updates the value and ensures that prior loads and stores are not reordered after this access.This method returns true if set a new value to AtomicRefrence is successful.

Syntax:

public final boolean
       weakCompareAndSetRelease(int i,
                                E expectedValue,
                                E newValue)

Parameters: This method accepts i which is an index of AtomicReferenceArray to perform the operation, 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 weakCompareAndSetRelease() method:
Program 1:




// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetRelease() method
  
import java.util.concurrent.atomic.AtomicReferenceArray;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an atomic reference object.
        AtomicReferenceArray<Double> ref
            = new AtomicReferenceArray<Double>(5);
  
        // set some value
        ref.set(0, 321.00);
        ref.set(1, 123.00);
        ref.set(2, 322.00);
  
        // apply weakCompareAndSetRelease()
        boolean result
            = ref.weakCompareAndSetRelease(
                1,
                124.00,
                234.32);
  
        // print value
        System.out.println("Setting new value"
                           + " is successful = "
                           + result);
  
        System.out.println("Value of index 1 = "
                           + ref.get(1));
    }
}

Output:

Program 2:




// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetRelease() method
  
import java.util.concurrent.atomic.AtomicReferenceArray;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an atomic reference object.
        AtomicReferenceArray<String> ref
            = new AtomicReferenceArray<String>(5);
  
        // set some value
        ref.set(0, "GFG");
        ref.set(1, "JAVA");
  
        // apply weakCompareAndSetVolatile()
        boolean result
            = ref.weakCompareAndSetVolatile(
                0, "GFG",
                "PYTHON");
  
        // print value
        System.out.println("Setting new value"
                           + " is successful = "
                           + result);
  
        System.out.println("Value of index 0 = "
                           + ref.get(0));
    }
}

Output:

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


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