AtomicReference weakCompareAndSetVolatile() method in Java with Examples
Last Updated :
17 Apr, 2023
The weakCompareAndSetVolatile() 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 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(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 weakCompareAndSetVolatile() method: Program 1:
Java
import java.util.concurrent.atomic.AtomicReference;
public class GFG {
public static void main(String[] args)
{
AtomicReference<Double> ref
= new AtomicReference<Double>();
ref.set( 1234.00 );
boolean result
= ref.weakCompareAndSetVolatile( 124.00 ,
234.32 );
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("GFG");
boolean result
= ref.weakCompareAndSetVolatile(
"GFG",
"GEEKS FOR 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#weakCompareAndSetVolatile(V, V)
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