Java tutorial
import java.util.concurrent.atomic.AtomicLongArray; public class Main { public static void main(String[] argv) throws Exception { AtomicLongArray atomicLongArray = new AtomicLongArray(new long[] { 1L, 2L, 3L, 4L }); atomicLongArray.weakCompareAndSet(2, 10L, 20L); System.out.println(atomicLongArray); } }