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–
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