struts中Action定义全局友元变量的问题。

Question

public class SmsClientAction extends DispatchAction {

int temp;
public ActionForward getA(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
{
temp = 1;
System.out.println("A"+temp);
}

public ActionForward getB(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
{
temp = 2;
System.out.println("B"+temp);
}

}

}

如上所示。我做个线程里面循环 同时请求getA 和getB 会不会产生temp值乱了的问题？ 如果int temp定义为private 呢?

Answer 1

这样一定会出问题的，
temp你没有加同步，
int temp定义为private 也没用

你要加上同步代码或这么定义

volatile int temp;