我是
Java的新手,我正在尝试生成一个每5到10秒运行一次的任务,所以在5到10之间的任何时间间隔,包括10.
我尝试了几件事但到目前为止没有任何工作.我最近的努力如下：
timer= new Timer();
Random generator = new Random();
int interval;
//The task will run after 10 seconds for the first time:
timer.schedule(task,10000);
//Wait for the first execution of the task to finish:
try {
sleep(10000);
} catch(InterruptedException ex) {
ex.printStackTrace();
}
//Afterwards,run it every 5 to 10 seconds,until a condition becomes true:
while(!some_condition)){
interval = (generator.nextInt(6)+5)*1000;
timer.schedule(task,interval);
try {
sleep(interval);
} catch(InterruptedException ex) {
ex.printStackTrace();
}
}
“任务”是一个TimerTask.我得到的是：
Exception in thread "Thread-4" java.lang.IllegalStateException: Task already scheduled or cancelled
我从here了解到TimerTask无法重用,但我不知道如何修复它.顺便说一下,我的TimerTask非常复杂,至少持续1.5秒.
任何帮助将非常感谢,谢谢！
解决方法
尝试
public class Test1 {
static Timer timer = new Timer();
static class Task extends TimerTask {
@Override
public void run() {
int delay = (5 + new Random().nextInt(5)) * 1000;
timer.schedule(new Task(),delay);
System.out.println(new Date());
}
}
public static void main(String[] args) throws Exception {
new Task().run();
}
}
