OptionalLong isPresent() method in Java with examples

OptionalLong help us to create an object which may or may not contain a Long value. The isPresent() method help us to get the answer that a value is present in OptionalLong object or not. If a long value is present in this object, this method 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
// OptionalLong.isPresent() method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalLong
        OptionalLong opLong
            = OptionalLong.of(45213246);
  
        // get value using isPresent()
        System.out.println("OptionalLong "
                           + "has a value= "
                           + opLong.isPresent());
    }
}

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Output:

OptionalLong has a value= true

Program 2:

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// Java program to demonstrate
// OptionalLong.isPresent() method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalLong
        OptionalLong opLong = OptionalLong.empty();
  
        // try to get that value is present or not
        boolean response = opLong.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/OptionalLong.html#isPresent()



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