AtomicIntegerArray getAndAdd() method in Java with Examples

The Java.util.concurrent.atomic.AtomicIntegerArray.getAndAdd() is an inbuilt method in Java that atomically adds the given value to the element at an index of the AtomicIntegerArray. This method takes the index value of the AtomicIntegerArray and the value to be added as the parameters and returns the value before the add oparation. 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 int getAndAdd(int i, int 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 value before the add operation which is in Integer.

Below programs illustrate the above method:

Program 1:

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// Java program that demonstrates
// the getAndAdd() function
  
import java.util.concurrent.atomic.AtomicIntegerArray;
  
public class GFG {
    public static void main(String args[])
    {
        // Initializing an array
        int a[] = { 10, 22, 33, 44, 55 };
  
        // Initializing an AtomicIntegerArray with array a
        AtomicIntegerArray arr = new AtomicIntegerArray(a);
  
        // Displaying the AtomicIntegerArray
        System.out.println("The array : " + arr);
  
        // Index where value is to be added
        int idx = 0;
  
        // Value to add with value at idx
        int x = 16;
  
        // Updating the value at
        // idx applying getAndAdd and
        // storing the previous value
        int 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 AtomicIntegerArray
        System.out.println("The array after update : "
                           + arr);
    }
}

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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:

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// Java program that demonstrates
// the getAndAdd() function
  
import java.util.concurrent.atomic.AtomicIntegerArray;
  
public class GFG {
    public static void main(String args[])
    {
        // Initializing an array
        int a[] = { 1, 2, 3, 4, 5 };
  
        // Initializing an AtomicIntegerArray with array a
        AtomicIntegerArray arr = new AtomicIntegerArray(a);
  
        // Displaying the AtomicIntegerArray
        System.out.println("The array : " + arr);
  
        // Index where value is to be added
        int idx = 3;
  
        // Value to add with value at idx
        int x = 16;
  
        // Updating the value at
        // idx applying getAndAdd and
        // storing the previous value
        int 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 AtomicIntegerArray
        System.out.println("The array after update : "
                           + arr);
    }
}

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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/AtomicIntegerArray.html#getAndAdd-int-int-



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