AtomicBoolean getAndSet() method in Java with Examples

Last Updated : 27 Feb, 2019
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 
// 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 
// 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-
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