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 )); } } |
