OptionalInt ifPresent(IntConsumer) method in Java with examples
The ifPresent(java.util.function.IntConsumer) 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 does nothing.
Syntax:
public void ifPresent(IntConsumer 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 NullPointerException if a value is present and the given action is null.
Below programs illustrate ifPresent(IntConsumer) method:
Program 1:
Java
// Java program to demonstrate // OptionalInt.ifPresent(IntConsumer) method import java.util.OptionalInt; public class GFG { public static void main(String[] args) { // create a OptionalInt OptionalInt opint = OptionalInt.of( 2234 ); // apply ifPresent(IntConsumer) opint.ifPresent((value) -> { value = value * 2 ; System.out.println("Value after modification:=> " + value); }); } } |
Output: Program 2:
Java
// Java program to demonstrate // OptionalInt.ifPresent(IntConsumer) method import java.util.OptionalInt; public class GFG { public static void main(String[] args) { // create a OptionalInt OptionalInt opint = OptionalInt.empty(); // apply ifPresent(IntConsumer) opint.ifPresent((value) -> { value = value * 2 ; System.out.println("Value after modification:=> " + value); }); System.out.println("As OptionalInt is empty value" + " is not modified"); } } |
Output: References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalInt.html#ifPresent(java.util.function.IntConsumer)
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