AtomicLongArray getAndAdd() method in Java with Examples

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 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 long getAndAdd(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 value before the add operation which is in long.

    Below programs illustrate the above method:

    Program 1:

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    // 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);
        }
    }

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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.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);
        }
    }

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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/AtomicLongArray.html#getAndAdd-int-long-



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