AtomicReferenceArray weakCompareAndSetVolatile() method in Java with Examples
The weakCompareAndSetVolatile() 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 with memory effects as specified by VarHandle.weakCompareAndSet(java.lang.Object...).This method returns true if set a new value to AtomicReference is successful. Syntax:
public final boolean weakCompareAndSetVolatile(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 weakCompareAndSetVolatile() method: Program 1:
// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetVolatile() 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(1, 1234.00);
ref.set(0, 2234.00);
ref.set(2, 3234.00);
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile(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));
}
}

Program 2:
// Java program to demonstrate AtomicReferenceArray
// weakCompareAndSetVolatile() 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, "AMANDIP");
ref.set(1, "AMAN");
// apply weakCompareAndSetVolatile()
boolean result
= ref.weakCompareAndSetVolatile(
0,
"AMARDIP",
"AMAR");
// print value
System.out.println("Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get(0));
}
}
