What is the AtomicInteger.getAndDecrement method in Java ?
An AtomicInteger represents an integer value that may be updated atomically.
An atomic operation is performing a single unit of work on a resource. During that operation, no other operations are allowed access to the same resource until the performing operation is finished.
The AtomicInteger is present in the java.util.concurrent.atomic package.
The getAndDecrement method of the AtomicInteger will atomically decrement the current value of the AtomicInteger by 1 and return the value before decrementing.
Syntax
public final int getAndDecrement()
Parameters
This method doesn’t take in any arguments.
Return value
This method returns the value of the AtomicInteger before decrementing it.
Code
The below code demonstrates how to use the getAndDecrement method.
import java.util.concurrent.atomic.AtomicInteger;class GetAndDecrement{public static void main(String[] args) {AtomicInteger atomicInteger = new AtomicInteger(10);System.out.println("The value in the atomicInteger object is " + atomicInteger.get());System.out.println("\nCalling atomicInteger.getAndDecrement()");int val = atomicInteger.getAndDecrement();System.out.println("The Value Before decrementing is : " + val);System.out.println("The Value is : " + atomicInteger.get());}}
Explanation
-
Line 1: We have imported the
AtomicIntegerclass. -
Line 4: We have created a new object for the
AtomicIntegerclass with the nameatomicIntegerand with the value10. -
Line 9: We have called the
getAndDecrementmethod. This method will decrement the current value (10) by1and return the value before decrementing it (10).
