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AtomicLongArray getAndAdd() method in Java with Examples

  • Last Updated : 24 Nov, 2021

The Java.util.concurrent.atomic.AtomicLongArray.getAndAdd() 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 of the AtomicLongArray and the value to be added as the parameters and returns the value before the add operation. The function getAndAdd() is similar to addAndGet() but the former function returns the value before the add operation whereas the latter returns the value after the add operation.
Syntax:

public final long getAndAdd(int i, long delta)  

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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 value before the add operation which is in long.
Below programs illustrate the above method:
Program 1: 



Java




// Java program that demonstrates
// the getAndAdd() 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 getAndAdd and
        // storing the previous value
        long prev = arr.getAndAdd(idx, x);
 
        // Previous value at index idx
        // before update
        System.out.println("Value at index " + idx
                           + " before update is " + prev);
 
        // Displaying the AtomicLongArray
        System.out.println("The array after update : "
                           + arr);
    }
}
Output: 
The array : [10, 22, 33, 44, 55]
Value at index 0 before update is 10
The array after update : [26, 22, 33, 44, 55]

 

Program 2: 
 

Java




// Java program that demonstrates
// the getAndAdd() 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 getAndAdd and
        // storing the previous value
        long prev = arr.getAndAdd(idx, x);
 
        // Previous value at index idx
        // before update
        System.out.println("Value at index " + idx
                           + " before update is "
                           + prev);
 
        // Displaying the AtomicLongArray
        System.out.println("The array after update : "
                           + arr);
    }
}
Output: 
The array : [1, 2, 3, 4, 5]
Value at index 3 before update is 4
The array after update : [1, 2, 3, 20, 5]

 

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




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