OptionalLong ifPresentOrElse() method in Java with examples
The ifPresentOrElse(java.util.function.LongConsumer, java.lang.Runnable) 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 performs the given empty-based Runnable emptyAction, passed as the second parameter
Syntax:
public void ifPresentOrElse(LongConsumer 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 // OptionalLong.ifPresentOrElse() method import java.util.OptionalLong; public class GFG { public static void main(String[] args) { // create a OptionalLong OptionalLong oplong = OptionalLong.of( 12 ); // apply ifPresentOrElse oplong.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 // OptionalLong.ifPresentOrElse method import java.util.OptionalLong; public class GFG { public static void main(String[] args) { // create a OptionalLong OptionalLong oplong = OptionalLong.empty(); // apply ifPresentOrElse oplong.ifPresentOrElse( (value) -> { System.out.println("Value is present, its: " + value); }, () -> { System.out.println("Value is empty"); }); } } |
Output:
Value is empty
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#ifPresentOrElse(java.util.function.LongConsumer, java.lang.Runnable)
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