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 methodimport 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"); });    }} |
Output:
Value is empty
