The orElseGet(java.util.function.DoubleSupplier) method helps us to get the value in this OptionalDouble object. If a value is not present in this OptionalDouble, then this method returns the result produced by the supplying function, passed as the parameter
Syntax:
public double orElseGet(DoubleSupplier supplier)
Parameters: This method accepts the supplying function that produces a value to be returned.
Return value: This method returns the double value, if present, otherwise the result produced by the supplying function.
Exception: This method throw NullPointerException if no value is present and the supplying function is null.
Below programs illustrate orElseGet(java.util.function.DoubleSupplier) method:
Program 1:
Java
// Java program to demonstrate// OptionalDouble.orElseGet(DoubleSupplier) methodimport java.util.OptionalDouble;public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opdouble = OptionalDouble.of(2134); // get value using orElseGet double value = opdouble.orElseGet(() -> getdoubleValue()); // print double value System.out.println("value: " + value); } public static double getdoubleValue() { return 3242 + 123; }} |
Output:
value: 2134.0
Program 2:
Java
// Java program to demonstrate// OptionalDouble.orElseGet(DoubleSupplier) methodimport java.util.OptionalDouble;public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opdouble = OptionalDouble.empty(); // get value using orElseGet double value = opdouble.orElseGet(() -> getdoubleValue()); // print double value System.out.println("value: " + value); } public static double getdoubleValue() { return 3242 * 234; }} |
Output:
value: 758628.0
