如何让 Java 程序在几秒钟后退出
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How to make Java program exit after a couple of seconds
提问by EmaadP
Is there anyway I can exit a java program after a couple of seconds e.g. 5 seconds.
无论如何我可以在几秒钟后退出一个java程序，例如5秒。
I know you can quit the java program using:
我知道您可以使用以下方法退出 java 程序：
System.exit(0);
But I'm not sure whether the 0 stands for seconds since this code:
但我不确定 0 是否代表自这段代码以来的秒数：
System.exit(10);
also exits instantly
也立即退出
回答by nate_weldon
System.exit(0) specifies the exit error code of the program.
System.exit(0) 指定程序的退出错误代码。
you can put it on a timer and schedule the task
你可以把它放在计时器上并安排任务
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class TimedExit {
Timer timer = new Timer();
TimerTask exitApp = new TimerTask() {
public void run() {
System.exit(0);
}
};
public TimedExit() {
timer.schedule(exitApp, new Date(System.currentTimeMillis()+5*1000));
}
}
and then you can just called TimedExit()
然后你就可以调用 TimedExit()
回答by Juvanis
You can invoke Thread.sleep()just before you exit your program:
您可以Thread.sleep()在退出程序之前调用：
// Your code goes here.
try
{
Thread.sleep(5000);
}
catch (InterruptedException e)
{
// log the exception.
}
System.exit(0);
回答by Francisco Spaeth
From System.exit(int)method documentation:
来自System.exit(int)方法文档：
Terminates the currently running Java Virtual Machine. The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination.
终止当前运行的 Java 虚拟机。参数用作状态码；按照惯例，非零状态代码表示异常终止。
If you need to execute something during the time waiting for exit, you could create a control thread, that will just wait for the right time to perform the exit like this:
如果您需要在等待退出期间执行某些操作，您可以创建一个控制线程，它只会等待合适的时间来执行退出，如下所示：
public class ExitFewMiliseconds {
public static void main(String args[]) {
new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.exit(0);
}
}).start();
while (true) {
System.out.println("I'm doing something");
}
}
}
If nothing shall be executing while waiting for exit, you could simply use a Thread.sleep(ms)
如果在等待退出时什么都不执行，您可以简单地使用Thread.sleep(ms)
回答by Avi
The 0 you pass into System.exit(0) has nothing to do with how long it will wait before exiting. Javadocs are your friend. From the javadoc:
您传递给 System.exit(0) 的 0 与退出前等待的时间无关。 Javadocs 是您的朋友。从javadoc：
The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination.
参数用作状态码；按照惯例，非零状态代码表示异常终止。
Other answers already cover how to wait 5 seconds before exiting if you really need to do that.
如果您确实需要这样做，其他答案已经涵盖了如何在退出前等待 5 秒。
回答by tarunajain
import java.util.Timer;
import java.util.TimerTask;
/**
* Simple demo that uses java.util.Timer to schedule a task
* to execute once 5 seconds have passed.
*/
class Reminder {
Timer timer;
public Reminder(int seconds) {
timer = new Timer();
timer.schedule(new RemindTask(), seconds * 1000);
}
class RemindTask extends TimerTask {
public void run() {
System.out.format("Time's up!%n");
System.exit();
timer.cancel(); //Terminate the timer thread
}
}
public static void main(String args[]) {
new Reminder(10);
System.out.format("Task scheduled.%n");
}
}
In this way you can use the Timer class and exit the system after a particular time interval
通过这种方式，您可以使用 Timer 类并在特定时间间隔后退出系统
