OptionalDouble isPresent() method in Java with examples
OptionalDouble help us to create an object which may or may not contain a Double value. The isPresent() method help us to get the answer that double value is present in OptionalDouble object or not. If a double value is present, returns true, otherwise false.
Syntax:
public boolean isPresent()
Parameters: This method accepts nothing.
Return value: This method returns true if a value is present, otherwise false
Below programs illustrate isPresent() method:
Program 1:
// Java program to demonstrate// OptionalDouble.isPresent() method import java.util.OptionalDouble; public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opDouble = OptionalDouble.of(3148.1345); // get value using isPresent() System.out.println("OptionalDouble" + " has a value= " + opDouble.isPresent()); }} |
OptionalDouble has a value= true
Program 2:
// Java program to demonstrate// OptionalDouble.isPresent() method import java.util.OptionalDouble; public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opDouble = OptionalDouble.empty(); // try to get that value is present or not boolean response = opDouble.isPresent(); if (response) System.out.println("Value present"); else System.out.println("Value absent"); }} |
Value absent
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#isPresent()
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