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 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:
// 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: