Java DoubleAccumulator accumulate()用法及代碼示例

Java.DoubleAccumulator.accumulate()方法是Java中的一種內置方法，它使用此DoubleAccumulator實例中的給定值進行更新。這意味著它將一個雙精度值作為參數，並將其加到調用它的DoubleAccumulator的實例中。

用法:

public void accumulate(double valueToBeAccumulated)

參數：此方法接受單個強製性參數valueToBeAccumulated，它是此DoubleAccumulator的當前實例中要更新的雙精度值。

返回值：此方法不返回任何值。它隻是更新此DoubleAccumulator。

以下程序演示了該函數：

示例1:

// Java program to demonstrate 
// the accumulate() method 
  
import java.lang.*; 
import java.util.concurrent.atomic.DoubleAccumulator; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Create the DoubleAccumulator instance 
        DoubleAccumulator num 
            = new DoubleAccumulator(Double::sum, 
                                    0L); 
  
        // Print after accumulator 
        System.out.println("Current DoubleAccumulator"
                           + " value is: "
                           + num); 
  
        // Update 2 in this instance 
        // using accumulate() method 
        num.accumulate(2); 
  
        // Print after accumulator 
        System.out.println("Updated DoubleAccumulator"
                           + " value is: "
                           + num); 
    } 
}

輸出：

Current DoubleAccumulator value is: 0.0
Updated DoubleAccumulator value is: 2.0

示例2:

// Java program to demonstrate 
// the accumulate() method 
  
import java.lang.*; 
import java.util.concurrent.atomic.DoubleAccumulator; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Create the DoubleAccumulator instance 
        DoubleAccumulator num 
            = new DoubleAccumulator(Double::sum, 
                                    0L); 
  
        // Print after accumulator 
        System.out.println("Current DoubleAccumulator"
                           + " value is: "
                           + num); 
  
        // Update 42.2 in this instance 
        // using accumulate() method 
        num.accumulate(42.2); 
  
        // Print after accumulator 
        System.out.println("Updated DoubleAccumulator"
                           + " value is: "
                           + num); 
    } 
}

輸出：

Current DoubleAccumulator value is: 0.0
Updated DoubleAccumulator value is: 42.2

相關用法

注：本文由純淨天空篩選整理自Twinkl Bajaj大神的英文原創作品 DoubleAccumulator accumulate() 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。