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:

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// 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());
    }
}

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Output:


OptionalDouble has a value= true





Program 2: 











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// 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"); 


    } 


} 



















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Output:


Value absent





References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#isPresent()



          
          
          
          

            

    

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