相关疑难解决方法(0)

那个java原始整数(int)是原子的吗？两个共享一个int的线程的一些实验似乎表明它们是,但当然没有证据表明它们不是并不暗示它们是.

具体来说,我跑的测试是这样的:

public class IntSafeChecker {
    static int thing;
    static boolean keepWatching = true;

    // Watcher just looks for monotonically increasing values   
    static class Watcher extends Thread {
        public void run() {
            boolean hasBefore = false;
            int thingBefore = 0;

            while( keepWatching ) {
                // observe the shared int
                int thingNow = thing;
                // fake the 1st value to keep test happy
                if( hasBefore == false ) {
                    thingBefore = thingNow;
                    hasBefore = true;
                }
                // …