DoubleAdder sum() method in Java with Examples

The java.DoubleAdder.sum() is an inbuilt method in java that returns the current sum. When the object of the class is created its initial value is zero.

Syntax:

public double sum()

Parameters: This method does not accepts any parameter.

Return Value: This method returns the current sum.

Below programs illustrate the above method:

Program 1:

// Program to demonstrate the sum() 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 variable num
        num.sum();

        // Print after add operation
        System.out.println(" the current value is: " + num);
    }
}

Output:

the current value is: 52.0

Program 2:

// Program to demonstrate the sum() 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(10);

        // sum operation on variable num
        num.sum();

        // Print after add operation
        System.out.println(" the current value is: " + num);
    }
}

Output:

the current value is: 10.0

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