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 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 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"); }); 
    } 
} 