The Java.util.concurrent.atomic.AtomicLong.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 long.
Syntax:
public final long getAndSet(long 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.AtomicLong;  public class GFG {    public static void main(String args[])    {          // Initially value as 0        AtomicLong val = new AtomicLong(0);          // Updates and sets        long res            = val.getAndSet(10);          System.out.println("Previous value: "                           + res);          // Prints the updated value        System.out.println("Current value: "                           + val);    }} |
Output:
Previous value: 0 Current value: 10
Program 2:
// Java program that demonstrates// the getAndSet() function  import java.util.concurrent.atomic.AtomicLong;  public class GFG {    public static void main(String args[])    {          // Initially value as 18        AtomicLong val = new AtomicLong(18);          // Gets and updates        long res = val.getAndSet(12);          System.out.println("Previous value: "                           + res);        // Prints the updated value        System.out.println("Current value: "                           + val);    }} |
Output:
Previous value: 18 Current value: 12
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html#getAndSet–
