The Java.util.concurrent.atomic.AtomicLongArray.getAndUpdate() is an inbuilt method in Java that updates the value at any given index of the AtomicLongArray after applying a given update function on the value at that index. The method takes the index value of the AtomicLongArray and the update function as the parameters and updates the value at that index by applying the update function on that value. The function should be side-effect-free, since it may be re-applied when attempted updates fail due to contention among threads. The only difference between the getAndUpdate() and updateAndGet() function is that the former returns the value before the update and the latter returns the value after the update.
public final long getAndUpdate(int i, LongUnaryOperator updateFunction)
Parameters: The function accepts two parameters:
Return value: The function returns a long value which is the value after applying the specified update function.
Below programs illustrate the above method:
The array : [1, 2, 3, 4, 5] The value before update at index 3 is 4 The array after update : [1, 2, 3, 16, 5]
The array : [1, 2, 3, 4, 5] The value before update at index 3 is 4 The array after update : [1, 2, 3, 64, 5]
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