import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.IntStream;
public
class Atomic1 {
private static final int NUM_INCREMENTS =
1000;
private static AtomicInteger atomicInt =
new AtomicInteger(
0);
public static
void main(String[] args) {
testIncrement();
testAccumulate();
testUpdate();
}
private static
void testUpdate() {
atomicInt.set(
0);
ExecutorService executor = Executors.newFixedThreadPool(
2);
IntStream.range(
0, NUM_INCREMENTS)
.forEach(i
-> {
Runnable
task = () ->
atomicInt.updateAndGet(n
-> n +
2);
executor.submit(task);
});
ConcurrentUtils.stop(executor);
System.out.format(
"Update: %d\n", atomicInt.get());
}
private static
void testAccumulate() {
atomicInt.set(
0);
ExecutorService executor = Executors.newFixedThreadPool(
2);
IntStream.range(
0, NUM_INCREMENTS)
.forEach(i
-> {
Runnable
task = () ->
atomicInt.accumulateAndGet
(i, (n, m) -> n + m);
executor.submit(task);
});
ConcurrentUtils.stop(executor);
System.out.format("Accumulate: %d\n", atomicInt.get());
}
private static void testIncrement() {
atomicInt.set(0);
ExecutorService executor = Executors.newFixedThreadPool(2);
IntStream.range(0, NUM_INCREMENTS)
.forEach(i -> executor.submit(atomicInt::incrementAndGet));
ConcurrentUtils.stop(executor);
System.out.format("Increment: Expected=%d; Is=%d\n", NUM_INCREMENTS, atomicInt.get());
}
}
转载于:https://www.cnblogs.com/bilaisheng/p/10210901.html
相关资源：浅谈Java中的atomic包实现原理及应用
