The weakCompareAndSetAcquire() 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 at index i with memory ordering effects compatible with memory_order_acquire ordering. This method returns true if set a new value to AtomicReference is successful. Syntax:
public final boolean weakCompareAndSetAcquire( 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 set a new value to AtomicReference is successful. Below programs illustrate the weakCompareAndSetAcquire() method: Program 1:
// Java program to demonstrate // weakCompareAndSetAcquire() method import java.util.concurrent.atomic.*;
public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.
AtomicReferenceArray<Integer> ref
= new AtomicReferenceArray<Integer>( 5 );
// set some value
ref.set( 0 , 543 );
ref.set( 1 , 123 );
ref.set( 2 , 5443 );
// apply weakCompareAndSetAcquire()
boolean result
= ref.weakCompareAndSetAcquire(
0 ,
5443 ,
234 );
// print value
System.out.println(
"Setting new value"
+ " is successful = "
+ result);
System.out.println("Value of index 0 = "
+ ref.get( 0 ));
}
} |
Program 2:
// Java program to demonstrate // weakCompareAndSetAcquire() method public class GFG {
public static void main(String[] args)
{
// create an atomic reference object.c
AtomicReferenceArray<String> ref
= new AtomicReferenceArray<String>( 5 );
// set some value
ref.set( 0 , "C");
ref.set( 1 , "PYTHON");
ref.set( 2 , "TS");
ref.set( 3 , "C++");
ref.set( 4 , "C");
// apply weakCompareAndSetAcquire()
boolean result
= ref.weakCompareAndSetAcquire(
4 ,
"C",
"JAVA");
// print value
System.out.println(
"Setting new value"
+ " is successful = "
+ result);
System.out.println(
"Value of index 4 = "
+ ref.get( 4 ));
}
} |