OptionalInt isPresent() method in Java with examples

OptionalInt help us to create an object which may or may not contain a Int value. The isPresent() method help us to get the answer that Int value is present in OptionalInt object or not. If an int 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 an int value is present, otherwise false

Below programs illustrate isPresent() method:
Program 1:

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// Java program to demonstrate
// OptionalInt.isPresent() method
  
import java.util.OptionalInt;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalInt
        OptionalInt opInt = OptionalInt.of(12345);
  
        // get value using isPresent()
        System.out.println("OptionalInt has a value= "
                           + opInt.isPresent());
    }
}

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Output:

OptionalInt has a value= true

Program 2:

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



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