quit

I have a JMS listener app, and the class QueueReceive implements MessageListener.the main function as below: public static void main(String[] args) throws Exception { InitialContext ic = getInitialContext(); QueueReceive qr = new QueueReceive(); qr.init(ic, QUEUE); System.out.println("JMS Ready To Receive Messages ( To quit, send a \"quit\" message)."); // Wait until a "quit" message has been received. synchronized(qr) { while (! qr.quit) { try { qr.wait(); } catch (InterruptedException ie) {} } } qr.close(); } Is there any way to quit the app at a specific time within the program not by way

这个错误是如何产生的呢? 启动mysql 为什么会报 The server quit without updating PID file(....pid ) 产生的原因有几种, 1:配置文件出现错误my.cnf 2:/usr/local/mysql/data 文件夹 的权限问题 3:进程已存在 mysql 的服务 首先 说说楼主的遭遇, 由于 配置 mysql 默认编码格式的时候出现配置错误, 导致 启动mysql (后来才想起来 我改过配置文件了) The server quit without updating PID file(updat file .....pid ) 悲催的折腾到2点多,google 查各种资料..于是便有了上面几个总结 问题1 的解决: 由于我当时脑抽了估计,居然改/usr/local/mysql/my.cnf 配置文件,导致后来才发现这里改动过了, 但是mysql 启动的时候,我觉得应该是这样进行查找my.cnf 的 首先 /etc/my.cnf 是否存在 if( true): 读取/etc/my.cnf else: 读取/usr/local/mysql/my.cnf | /usr/local/mysql/my.cnf~ 检查发现 my.cnf 没问题,于是问题1 忽略( 结果就是折腾到2点,忽略了/usr/local/mysql/my.cnf 的检查

when I try to quit my Android application by overwriting the function for the back-button of Android devices and "System.exit(0)", this doesn't work. I have an activity named "LoginActivity" and an activity named "OverviewActivity". When I start an intent in OverviewActivity to switch to LoginActivity, this works. Intent changeViewIntent = new Intent(OverviewActivity.this, LoginActivity.class); startActivity(changeViewIntent); Now I am in LoginActivity and there is the overwritten method: @Override public void onBackPressed() { System.exit(0); } But when I press the back-key (e.g. in the