java.lang.IllegalStateException：即使我正在创建类本身的新实例，计时器也已取消
问题陈述：我有一堂课，里面有一个计时器。
class DeleteTimer {
private Timer timer = new Timer();
private static Timer timerStatic;
public DeleteTimer(Member uid, String serverFilePath, String deleteTime) {
}
public static void start() {
timerStatic.schedule(new TimerTask() {
public void run() {
deleteFolder();
try {
timerStatic.cancel();
} catch (Exception e) {
e.printStackTrace();
}
}
private void deleteFolder() {
//delete a folder
return true;
}
}, 10000);
}
}
我有一个程序可以创建一些文件夹，我希望这些文件夹在一段时间后自动删除。文件夹的名称不固定，因此每次调用此类时，我都会为其创建一个新对象。
DeleteTimer obj = new DeleteTimer();
obj.start();
第一次尝试时效果很好，但当我尝试使用新对象运行它时，会出现 java.lang.IllegalStateException: Timer hascancelled 。请帮忙。
Problem statement: I have a class that has a timer in it.
class DeleteTimer {
private Timer timer = new Timer();
private static Timer timerStatic;
public DeleteTimer(Member uid, String serverFilePath, String deleteTime) {
}
public static void start() {
timerStatic.schedule(new TimerTask() {
public void run() {
deleteFolder();
try {
timerStatic.cancel();
} catch (Exception e) {
e.printStackTrace();
}
}
private void deleteFolder() {
//delete a folder
return true;
}
}, 10000);
}
}
I have a program that creates some folders and I want that those folders to be deleted automatically after some time. the name of the folders are not fixed and hence every time I call this class, I create a new object for it.
DeleteTimer obj = new DeleteTimer();
obj.start();
This works fine at first attempt, but gives java.lang.IllegalStateException: Timer already cancelled when I try to run it using a new object. Please help.
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timerStatic被声明为static，这意味着DeleteTimer的所有实例共享同一个timerStatic实例。如果您删除
start方法和timerStatic上的static修饰符，这将阻止类的不同实例相互干扰。timerStaticis declaredstatic, which means that all instances ofDeleteTimershare the same instance oftimerStatic.If you remove the
staticmodifier on both thestartmethod andtimerStatic, this will stop different instances of your class interfering with each other.