OptionalLong ifPresent(LongConsumer) method in Java with examples

The ifPresentOrElse(java.util.function.LongConsumer) method helps us to perform the specified LongConsumer action the value of this OptionalLong object. If a value is not present in this OptionalLong, then this method does nothing.

Syntax:

public void ifPresentOrElse(LongConsumer action)

Parameters: This method accepts a parameter action which is the action to be performed on this Optional, if a value is present.



Return value: This method returns nothing.

Exception: This method throw NullPolongerException if a value is present and the given action is null.

Below programs illustrate ifPresent(LongConsumer) method:
Program 1:

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// Java program to demonstrate
// OptionalLong.ifPresent(LongConsumer) method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalLong
        OptionalLong oplong
            = OptionalLong.of(23456745678L);
  
        // apply ifPresent(LongConsumer)
        oplong.ifPresent((value) -> {
  
            value = Math.round(value * 0.19);
            System.out.println("Value after modification:=> "
                               + value);
        });
    }
}

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Output:

Program 2:

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// Java program to demonstrate
// OptionalLong.ifPresent(LongConsumer) method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalLong
        OptionalLong oplong = OptionalLong.empty();
  
        // apply ifPresent(LongConsumer)
        oplong.ifPresent((value) -> {
  
            value = value * 132435;
            System.out.println("Value:=> "
                               + value);
        });
  
        System.out.println("As OptionalLong is empty value"
                           + " is not modified");
    }
}

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Output:

References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#ifPresent(java.util.function.LongConsumer)



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