OptionalDouble isPresent() method in Java with examples
Last Updated :
01 May, 2019
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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:
Java
Java
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());
}
}
// Java program to demonstrate// OptionalDouble.isPresent() methodimport 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()); }}
Output:
Program 2:
OptionalDouble has a value= true
// 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");
}
}
// Java program to demonstrate// OptionalDouble.isPresent() methodimport 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"); }}
Output:
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#isPresent()
Value absent
