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Java DoubleAdder sumThenReset()用法及代碼示例

java.DoubleAdder.sumThenReset()是Java中的一種內置方法,等效於sum(),然後是reset()方法,該方法首先計算有效和,然後重置該值以保持零值。創建類的對象時,其初始值為零。

用法:

public double sumThenReset()

參數:此方法不接受任何參數。


返回值:該方法返回總和。

以下示例程序旨在說明上述方法:

程序1

// Program to demonstrate the sumThenReset() method 
  
import java.lang.*; 
import java.util.concurrent.atomic.DoubleAdder; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        DoubleAdder num = new DoubleAdder(); 
  
        // add operation on num 
        num.add(42); 
        num.add(10); 
  
        // sum operation on num 
        num.sum(); 
  
        // Print after sum operation 
        System.out.println(" the value after sum is: " + num); 
  
        // sumThenReset operation on variable num 
        num.sumThenReset(); 
  
        // Print after sumThenReset operation 
        System.out.println("the current value is: " + num); 
    } 
}
輸出:
the value after sum is: 52.0
the current value is: 0.0

程序2

// Program to demonstrate the sumThenReset() method 
  
import java.lang.*; 
import java.util.concurrent.atomic.DoubleAdder; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        DoubleAdder num = new DoubleAdder(); 
  
        // add operation on num 
        num.add(254); 
  
        // sum operation on num 
        num.sum(); 
  
        // Print after sum operation 
        System.out.println(" the value after sum is: " + num); 
  
        // sumThenReset operation on variable num 
        num.sumThenReset(); 
  
        // Print after sumThenReset operation 
        System.out.println("the current value is: " + num); 
    } 
}
輸出:
the value after sum is: 254.0
the current value is: 0.0

參考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/DoubleAdder.html#sumThenReset–



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注:本文由純淨天空篩選整理自Twinkl Bajaj大神的英文原創作品 DoubleAdder sumThenReset() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。