The java.DoubleAdder.longValue() is an inbuilt method in java that returns the sum() as a long after a narrowing primitive conversion. When the object of the class is created its initial value is zero.
Syntax:
public long longValue()
Parameters:Return value: This method returns the numeric value represented by this object after conversion to long data type.
Below programs illustrate the above method:
Program 1:
// Program to demonstrate the longValue() 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);          // longValue operation on variable num        num.longValue();          // Print after longValue operation        System.out.println("the value after longValue() is: " + num);    }} |
Output:
the value after longValue() is: 52.0
Program 2:
// Program to demonstrate the longValue() 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(62);          // longValue operation on variable num        num.longValue();          // Print after longValue operation        System.out.println("the value after longValue() is: " + num);    }} |
Output:
the value after longValue() is: 62.0
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/DoubleAdder.html#longValue–
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