Optional isPresent() method in Java with examples

The isPresent() method of java.util.Optional class in Java is used to find out if there is a value present in this Optional instance. If there is no value present in this Optional instance, then this method returns false, else true.

Syntax:

public boolean isPresent()

Parameters: This method do not accept any parameter.



Return value: This method returns a boolean value stating whether if there is a value present in this Optional instance.

Below programs illustrate isPresent() method:
Program 1:

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// Java program to demonstrate
// Optional.isPresent() method
  
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a Optional
        Optional<Integer> op
            = Optional.of(9455);
  
        // print value
        System.out.println("Optional: "
                           + op);
  
        // check for the value
        System.out.println("Is any value present: "
                           + op.isPresent());
    }
}

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Output:

Optional: Optional[9455]
Is any value present: true

Program 2:

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// Java program to demonstrate
// Optional.isPresent() method
  
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a Optional
        Optional<Integer> op
            = Optional.empty();
  
        // print value
        System.out.println("Optional: "
                           + op);
  
        try {
  
            // check for the value
            System.out.println("Is any value present: "
                               + op.isPresent());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

Optional: Optional.empty
Is any value present: false

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Optional.html#isPresent–



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