AtomicLongArray addAndGet() method in Java with Examples

The Java.util.concurrent.atomic.AtomicLongArray.addAndGet() is an inbuilt method in Java that atomically adds the given value to the element at an index of the AtomicLongArray. This method takes the index value and the value to be added as the parameters and returns the updated value at this index.

Syntax:

public long addAndGet(int i, long delta)

Parameters: The function accepts two parameters:

i – The index where value is to be added.

delta – The value to be added.

Return value: The function returns the updated value which is in long.

Below programs illustrate the above method:
Program 1:

// Java program that demonstrates
// the addAndGet() function

import java.util.concurrent.atomic.AtomicLongArray;

public class GFG {
    public static void main(String args[])
    {
        // Initializing an array
        long a[] = { 10, 22, 33, 44, 55 };

        // Initializing an AtomicLongArray with array a
        AtomicLongArray arr = new AtomicLongArray(a);

        // Displaying the AtomicLongArray
        System.out.println("The array : " + arr);

        // Index where value is to be added
        int idx = 0;

        // Value to add with value at idx
        long x = 16;

        // Updating the value at
        // idx applying addAndGet
        arr.addAndGet(idx, x);

        // Displaying the AtomicLongArray
        System.out.println("The array after update : "
                           + arr);
    }
}

Output:

The array : [10, 22, 33, 44, 55]
The array after update : [26, 22, 33, 44, 55]

Program 2:

// Java program that demonstrates
// the addAndGet() function

import java.util.concurrent.atomic.AtomicLongArray;

public class GFG {
    public static void main(String args[])
    {
        // Initializing an array
        long a[] = { 1, 2, 3, 4, 5 };

        // Initializing an AtomicLongArray with array a
        AtomicLongArray arr = new AtomicLongArray(a);

        // Displaying the AtomicLongArray
        System.out.println("The array : " + arr);

        // Index where value is to be added
        int idx = 3;

        // Value to add with value at idx
        long x = 16;

        // Updating the value at
        // idx applying addAndGet
        arr.addAndGet(idx, x);

        // Displaying the AtomicLongArray
        System.out.println("The array after update : "
                           + arr);
    }
}

Output:

The array : [1, 2, 3, 4, 5]
The array after update : [1, 2, 3, 20, 5]

Reference:
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLongArray.html#addAndGet-int-long-