AtomicInteger decrementAndGet() method in Java with examples

The java.util.concurrent.atomic.AtomicInteger.decrementAndGet() is an inbuilt method in java that decreases the previous value by one and returns the value after updation which is of data-type int.

Syntax:

public final int decrementAndGet()

Parameters: The function does not accepts a single parameter. 
Return value: The function returns the value after decrement operation is performed to the previous value. 

Program below demonstrates the function:

Program 1: 

Java

// Java Program to demonstrates
// the decrementAndGet() function

import java.util.concurrent.atomic.AtomicInteger;

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

        // Initially value as 0
        AtomicInteger val
            = new AtomicInteger(0);

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

        // Decrement and get
        int res
            = val.decrementAndGet();

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

Output:

Previous value: 0
Current value: -1

Program 2: 

Java

// Java Program to demonstrates
// the decrementAndGet() function

import java.util.concurrent.atomic.AtomicInteger;

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

        // Initially value as 18
        AtomicInteger val
            = new AtomicInteger(18);

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

        // Decrement and get new value
        int res = val.decrementAndGet();

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

Output:

Previous value: 18
Current value: 17

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html#decrementAndGet–