AtomicInteger

import lombok.SneakyThrows;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class AtomicIntegerTest {

    private static final AtomicInteger atomicInteger = new AtomicInteger(0);

    @SneakyThrows
    public static final int getAndIncrement() {
        int current;
        int next = 0;
        do {
            current = atomicInteger.get();
            TimeUnit.SECONDS.sleep(2);
            // 防止越界
            next = current >= Integer.MAX_VALUE ? 0 : current + 1;
        } while (!atomicInteger.compareAndSet(current, next));
        System.out.println("next=" + next);
        return next;
    }

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            new Thread(AtomicIntegerTest::getAndIncrement).start();
        }
    }
}