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LongAdder sumThenReset() method in Java with Examples

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  • Last Updated : 28 Jan, 2019
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LongAdder class in Java creates a new adder with an initial sum of zero. The Java.LongAdder.sumThenReset() is an inbuilt method in Java that is equivalent to sum() then reset() function. Firstly, the sum is calculated and then it is reset to the value 0. When the object of the class is created its initial value is zero.

Syntax:

public long sumThenReset()

Parameters: The function does not accepts any parameter.

Return value: The method returns a long value which is the current sum of this LongAdder just before it is reset to 0.

Below programs demonstrate the above function:

Program 1:




// Java program to demonstrate
// the LongAdder.sumThenReset() method
  
import java.lang.*;
import java.util.concurrent.atomic.LongAdder;
  
public class GFG {
    public static void main(String args[])
    {
  
        // Initialized with 0
        LongAdder num = new LongAdder();
  
        // Print the initial value
        System.out.println("Initial value is: "
                           + num);
  
        // Add 6 to it
        num.add(6);
  
        // Print the final value
        System.out.println("After addition"
                           + " of 6, value is: "
                           + num);
  
        // Add 5 to it
        num.add(5);
  
        // Print the final value
        System.out.println("After addition"
                           + " of 5, value is: "
                           + num);
  
        // sumThenReset operation on num
        System.out.println("Returned sum before reset: "
                           + num.sumThenReset());
  
        // Print the current value
        System.out.println("Current value is: "
                           + num);
    }
}

Output:

Initial value is: 0
After addition of 6, value is: 6
After addition of 5, value is: 11
Returned sum before reset: 11
Current value is: 0

Program 2:




// Java program to demonstrate
// the LongAdder.sumThenReset() method
  
import java.lang.*;
import java.util.concurrent.atomic.LongAdder;
  
public class GFG {
    public static void main(String args[])
    {
  
        // Initialized with 0
        LongAdder num = new LongAdder();
  
        // Print the initial value
        System.out.println("Initial value is: "
                           + num);
  
        // Add 10 to it
        num.add(10);
  
        // Print the final value
        System.out.println("After addition"
                           + " of 10, value is: "
                           + num);
  
        // Add 100 to it
        num.add(100);
  
        // Print the final value
        System.out.println("After addition"
                           + " of 100, value is: "
                           + num);
  
        // sumThenReset operation on num
        System.out.println("Returned sum before reset: "
                           + num.sumThenReset());
  
        // Print the current value
        System.out.println("Current value is: "
                           + num);
    }
}

Output:

Initial value is: 0
After addition of 10, value is: 10
After addition of 100, value is: 110
Returned sum before reset: 110
Current value is: 0

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