OptionalInt ifPresentOrElse() method in Java with examples

Last Updated : 27 May, 2019

The ifPresentOrElse(java.util.function.IntConsumer, java.lang.Runnable) method helps us to perform the specified IntConsumer action the value of this OptionalInt object. If a value is not present in this OptionalInt, then this method performs the given empty-based Runnable emptyAction, passed as the second parameter Syntax:

public void ifPresentOrElse(IntConsumer action,
                            Runnable emptyAction)

Parameters: This method accepts two parameters:

action: which is the action to be performed on this Optional, if a value is present.
emptyAction: which is the empty-based action to be performed, if no value is present.

Return value: This method returns nothing. Exception: This method throw NullPointerException if a value is present and the given action is null, or no value is present and the given empty-based action is null. Below programs illustrate ifPresentOrElse() method: Program 1:

Java

// Java program to demonstrate
// OptionalInt.ifPresentOrElse() method

import java.util.OptionalInt;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt
        OptionalInt opint = OptionalInt.of(12);

        // apply ifPresentOrElse
        opint.ifPresentOrElse(
            (value)
                -> { System.out.println("Value is present, its: "
                                        + value); },
            ()
                -> { System.out.println("Value is empty"); });
    }
}

Output:

Value is present, its: 12

Program 2:

Java

// Java program to demonstrate
// OptionalInt.ifPresentOrElse method
import java.util.OptionalInt;

public class GFG {

    public static void main(String[] args)
    {

        // create a OptionalInt
        OptionalInt opint = OptionalInt.empty();

        // apply ifPresentOrElse
        opint.ifPresentOrElse(
            (value)
                -> { System.out.println("Value is present, its: "
                                        + value); },
            ()
                -> { System.out.println("Value is empty"); });
    }
}