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 AtomicRefrence 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)); }} |
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