Optional toString() method in Java with examples

The toString() method of java.util.Optional class in Java is used to get the string representation of this Optional instance.

Syntax:

public String toString()

Parameters: This method accepts nothing.



Return value: This method returns the string representation of this Optional instance.

Below programs illustrate toString() method:
Program 1:

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// Java program to demonstrate
// Optional.toString() method
  
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a Optional
        Optional<Integer> op
            = Optional.of(452146);
  
        // get value using toString
        String value = op.toString();
  
        // print value
        System.out.println("String Representation: "
                           + value);
    }
}

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Output:

String Representation: Optional[452146]

Program 2:

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// Java program to demonstrate
// Optional.toString() method
  
import java.util.Optional;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a Optional
        Optional<Integer> op
            = Optional.empty();
  
        // get value using toString
        String value = op.toString();
  
        // print value
        System.out.println("String Representation: "
                           + value);
    }
}

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Output:

String Representation: Optional.empty

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



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