AtomicReference getAndSet() method in Java with Examples

The getAndSet() method of a AtomicReference class is used to atomically sets the value of AtomicReference object to newValue which is passed as parameter and returns the old value of the AtomicReference object, with memory effects as specified by VarHandle.getAndSet(java.lang.Object…).VarHandle.getAndSet(java.lang.Object…) specified that variable is hanlde as memory semantics of setting as if the variable was declared volatile.

Syntax:

public final V getAndSet?(V newValue)

Parameters: This method accepts newValue which is the new value.

Return value: This method returns the old value of AtomicReference.

Below programs illustrate the getAndSet() method:
Program 1:



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// Java program to demonstrate
// AtomicReference.getAndSet() method
  
import java.util.concurrent.atomic.AtomicReference;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an atomic reference object.
        AtomicReference<Double> ref
            = new AtomicReference<Double>();
  
        // set some value
        ref.set(1234.00);
  
        // get and replace value
        double oldValue
            = ref.getAndSet((double)3213);
  
        // print
        System.out.println("OLD Value = "
                           + oldValue);
        System.out.println("NEW Value = "
                           + ref.get());
    }
}

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Output:

OLD Value = 1234.0
NEW Value = 3213.0

Program 2:

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// Java program to demonstrate
// AtomicReference.getAndSet() method
  
import java.util.concurrent.atomic.AtomicReference;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an atomic reference object.
        AtomicReference<String> ref
            = new AtomicReference<String>();
  
        // set some value
        ref.set("AtomicReference old value");
  
        // get and replace value
        String oldValue = ref.getAndSet(
            "AtomicReference new value");
  
        // print
        System.out.println("OLD Value = "
                           + oldValue);
        System.out.println("NEW Value = "
                           + ref.get());
    }
}

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Output:

OLD Value = AtomicReference old value
NEW Value = AtomicReference new value

References: https://docs.oracle.com/javase/10/docs/api/java/util/concurrent/atomic/AtomicReference.html#getAndSet(V)

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