Java 8: are longadder and longaccumulator the first choice for atomiclong?

Longadder as a substitute for atomiclong

ExecutorService executor = Executors.newFixedThreadPool(2);    
IntStream.range(0,1000)
    .forEach(i -> executor.submit(adder::increment));    
stop(executor);    
System.out.println(adder.sumThenReset());   // => 1000

Longaccumulator is a more general version of longadder

LongBinaryOperator op = (x,y) -> 2 * x + y;
LongAccumulator accumulator = new LongAccumulator(op,1L);

ExecutorService executor = Executors.newFixedThreadPool(2);
IntStream.range(0,10)
    .forEach(i -> executor.submit(() -> accumulator.accumulate(i)));
stop(executor);

System.out.println(accumulator.getThenReset());     // => 2539

I have some questions

>Does longadder always take precedence over atomiclong? > Is the longaccumulator the first choice for longadder and atomiclong?

Solution

Javadoc mentions the differences between these classes and when to use one of them Start with longadder:

Start with the longaccumulator:

Therefore, one uses the other depending on what your application is going to do It is not always strictly priority, only when high concurrency is expected and you need to maintain a common state