Java DoubleAccumulator accumulate()用法及代码示例

Java.DoubleAccumulator.accumulate()方法是Java中的一种内置方法，它使用此DoubleAccumulator实例中的给定值进行更新。这意味着它将一个双精度值作为参数，并将其加到调用它的DoubleAccumulator的实例中。

用法:

public void accumulate(double valueToBeAccumulated)

参数：此方法接受单个强制性参数valueToBeAccumulated，它是此DoubleAccumulator的当前实例中要更新的双精度值。

返回值：此方法不返回任何值。它只是更新此DoubleAccumulator。

以下程序演示了该函数：

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); 
    } 
}

输出：

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); 
    } 
}

输出：

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

相关用法

注：本文由纯净天空筛选整理自Twinkl Bajaj大神的英文原创作品 DoubleAccumulator accumulate() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。