The Java.util.concurrent.atomic.AtomicLong.getAndDecrement() is an inbuilt method in java that decreases the given value by one and returns the value before updation which is of data-type long.
Syntax:
public final long getAndDecrement()
Parameters: The function does not accepts a single parameter.
Return value: The function returns the value before decrement operation is performed to the previous value.
Below programs illustrate the above method:
Program 1:
// Java program that demonstrates// the getAndDecrement() 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);          // Decreases and gets        // the previous value        long res            = val.getAndDecrement();          // Prints the updated value        System.out.println("Previous value: "                           + res);          System.out.println("Current value: "                           + val);    }} |
Output:
Previous value: 0 Current value: -1
Program 2:
// Java program that demonstrates// the getAndDecrement() 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);          // Decreases 1 and gets        // the previous value        long res = val.getAndDecrement();          // Prints the updated value        System.out.println("Previous value: "                           + res);          System.out.println("Current value: "                           + val);    }} |
Output:
Previous value: 18 Current value: 17
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