AtomicBoolean getAndSet() method in Java with Examples

The Java.util.concurrent.atomic.AtomicBoolean.getAndSet() is an inbuilt method in java that sets the given value to the value passed in the parameter and returns the value before updation which is of data-type boolean.

Syntax:

public final boolean getAndSet(boolean val)

Parameters: The function accepts a single mandatory parameter val which specifies the value to be updated.

Return Value: The function returns the value before update operation is performed to the previous value.

Below programs illustrate the above method:

Program 1:

// Java program that demonstrates
// the getAndSet() function

import java.util.concurrent.atomic.AtomicBoolean;

public class GFG {
    public static void main(String args[])
    {

        // Initially value as false
        AtomicBoolean val = new AtomicBoolean(false);

        // Updates and sets
        boolean res
            = val.getAndSet(true);

        System.out.println("Previous value: "
                           + res);

        // Prints the updated value
        System.out.println("Current value: "
                           + val);
    }
}

Output:

Previous value: false
Current value: true

Program 2:

// Java program that demonstrates
// the getAndSet() function

import java.util.concurrent.atomic.AtomicBoolean;

public class GFG {
    public static void main(String args[])
    {

        // Initially value as true
        AtomicBoolean val = new AtomicBoolean(true);

        // Gets and updates
        boolean res = val.getAndSet(false);

        System.out.println("Previous value: "
                           + res);
        // Prints the updated value
        System.out.println("Current value: "
                           + val);
    }
}

Output:

Previous value: true
Current value: false

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html#getAndSet-boolean-