timer purge

計時器類purge()方法 (Timer Class purge() method)

• purge() method is available in java.util package.

  purge()方法在java.util包中可用。

• purge() method is used to remove all canceled tasks from the task queue of this Timer.

  purge()方法用于從此Timer的任務隊列中刪除所有已取消的任務。

• purge() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  purge()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• purge() method does not throw an exception at the time of canceling task.

  purge()方法在取消任務時不會引發異常。

Syntax:

句法：

    public int purge();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is int, it returns the removed cancelled task from the queue.

方法的返回類型為int ，它從隊列中返回已刪除的已取消任務。

Example:

例：

// Java program to demonstrate the example 
// of int purge() method of Timer
import java.util.*;
class CancelTimer extends TimerTask {
// Task defined in this method
public void run() {
System.out.println("In Stock...Stop Working");
}
}
public class PurgeOfTimer {
public static void main(String[] args) {
// Instantaites a TimerTask and
// Timer object
TimerTask task = new CancelTimer();
Timer tmr = new Timer();
// By using scheduleAtFixedRate() method isto
// schedule the task at a constant rate in a
// repeated manner
tmr.scheduleAtFixedRate(task, new Date(), 330);
// By using cancel() method is to
// cancel this timer and stop
// the scheduled task
System.out.println("tmr.cancel(): " + "Cancelled");
tmr.cancel();
// By using purge() method is to
// remove cancelled from the task
// list
System.out.println("tmr.purge(): " + tmr.purge());
}
}

Output

輸出量

tmr.cancel(): Cancelled
In Stock...Stop Working
tmr.purge(): 0

翻譯自: https://www.includehelp.com/java/timer-purge-method-with-example.aspx

timer purge