volatile关键字
筱米加步枪
posted @ 2010年3月09日 01:31
in [ JavaSE ]
with tags
volatile
, 1423 阅读
今天看《head first》时，无意中发现了volatile关键字~~百度~~
volatile是在多线程中使用的，平常我们声明一个变量，比如int x=1，那么在多线程中的时候，每个线程都有这个变量的一份拷贝，所以每个线程保存的值可以和“主”存区域的值不同（补充：“主”存区域保留的是变量的准确值）。
使用volatile修饰的变量，在所有的线程当中必须是同步的，一个线程改变了他的值，其他线程也会获得改变的这个值，他会不允许线程中有和“主”存区域不同的值，因此，用valatile修饰过的变量存取会更耗资源些。
2024年1月19日 06:15
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