AtomicReference weakCompareAndSetAcquire() method in Java with Examples
Last Updated :
18 Apr, 2023
The weakCompareAndSetAcquire() method of a AtomicReference class is used to atomically sets the value to newValue for AtomicReference if the current value is equal to expectedValue passed as parameter. This method updates the value 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(V expectedValue,
V newValue)
Parameters: This method accepts 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 weakCompareAndSetAcquire() method:
Program 1:
Java
import java.util.concurrent.atomic.AtomicReference;
public class GFG {
public static void main(String[] args)
{
AtomicReference<Long> ref
= new AtomicReference<Long>();
ref.set(11111111L);
boolean result
= ref.weakCompareAndSetAcquire(
1111111111111L,
999999L);
System.out.println( "Setting new value"
+ " is successful = "
+ result);
System.out.println( "Value = " + ref.get());
}
}
|
Output:
Program 2:
Java
import java.util.concurrent.atomic.AtomicReference;
public class GFG {
public static void main(String[] args)
{
AtomicReference<String> ref
= new AtomicReference<String>();
ref.set( "WELCOME TO GEEKS FOR GEEKS" );
boolean result
= ref.weakCompareAndSetAcquire(
"WELCOME TO GEEKS FOR GEEKS" ,
"WELCOLME GEEKS" );
System.out.println( "Setting new value"
+ " is successful = "
+ result);
System.out.println( "Value = " + ref.get());
}
}
|
Output:
References: https://docs.oracle.com/javase/10/docs/api/java/util/concurrent/atomic/AtomicReference.html#weakCompareAndSetAcquire(V, V)
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