The Java.util.concurrent.atomic.AtomicLongArray.accumulateAndGet() is an inbuilt method in java that atomically updates the element at index i with the results of applying the given function to the current and given values, returning the updated value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The function is applied with the current value at index i as its first argument, and the given update as the second argument.
Syntax:
public final long accumulateAndGet(int i, long x, LongBinaryOperator accumulatorFunction)
Parameters: The function accepts three parameters:
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 accumulateAndGet() function import java.util.concurrent.atomic.AtomicLongArray;
import java.util.function.LongBinaryOperator;
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 update is to be made
int idx = 4 ;
// Value to make operation with value at idx
long x = 5 ;
// Declaring the accumulatorFunction
LongBinaryOperator add = (u, v) -> u + v;
// Updating the value at idx
// applying accumulatorFunction
arr.accumulateAndGet(idx, x, add);
// Displaying the AtomicLongArray
System.out.println( "The array after update : "
+ arr);
}
} |
The array : [1, 2, 3, 4, 5] The array after update : [1, 2, 3, 4, 10]
Program 2:
// Java program that demonstrates // the accumulateAndGet() function import java.util.concurrent.atomic.AtomicLongArray;
import java.util.function.LongBinaryOperator;
public class GFG {
public static void main(String args[])
{
// Initializing an array
long a[] = { 17 , 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 update is to be made
int idx = 0 ;
// Value to make operation with value at idx
long x = 6 ;
// Declaring the accumulatorFunction
LongBinaryOperator sub = (u, v) -> u - v;
// Updating the value at idx
// applying accumulatorFunction
arr.accumulateAndGet(idx, x, sub);
// Displaying the AtomicLongArray
System.out.println( "The array after update : "
+ arr);
}
} |
The array : [17, 22, 33, 44, 55] The array after update : [11, 22, 33, 44, 55]