The Java.DoubleAccumulator.longValue() is an inbuilt method in java that returns the current value as a long after a narrowing primitive conversion. It means the initial datatype is double which is explicitly converted into type long.
Syntax:
public long longValue()
Parameters: The method does not accepts any parameter.
Return value: The method returns the current value as a long after a narrowing primitive conversion.
PBelow programs illustrate the above method:
Program 1:
// Java program to demonstrate the// longValue() method  import java.lang.*;import java.util.concurrent.atomic.DoubleAccumulator;  public class GFG {    public static void main(String args[])    {          DoubleAccumulator num            = new DoubleAccumulator(                Double::sum, 0L);          // accumulate operation on num        num.accumulate(42);        num.accumulate(10);          // Print before longValue operation        System.out.println("Old value is: "                           + num);          // Print after longValue operation        System.out.println("Current long value is: "                           + num.floatValue());    }} |
Output:
Old value is: 52.0 Current long value is: 52.0
Program 2:
// Java program to demonstrate the// longValue() method  import java.lang.*;import java.util.concurrent.atomic.DoubleAccumulator;  public class GFG {    public static void main(String args[])    {          DoubleAccumulator num            = new DoubleAccumulator(                Double::sum, 0L);          // accumulate operation on num        num.accumulate(26);        num.accumulate(45);          // Print before longValue operation        System.out.println("Old value is: "                           + num);          // Print after longValue operation        System.out.println("Current long value is: "                           + num.floatValue());    }} |
Output:
Old value is: 71.0 Current long value is: 71.0
