The empty() method of java.util.Optional class in Java is used to get an empty instance of this Optional class. This instance do not contain any value.
Syntax:
public static <T> Optional<T> empty()
Parameters: This method accepts nothing.
Return value: This method returns an empty instance of this Optional class.
Below programs illustrate empty() method:
Program 1:
// Java program to demonstrate// Optional.empty() 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);    }} |
Output:
Optional: Optional.empty
Program 2:
// Java program to demonstrate// Optional.empty() method  import java.util.*;  public class GFG {      public static void main(String[] args)    {          // create a Optional        Optional<String> op            = Optional.empty();          // print value        System.out.println("Optional: "                           + op);    }} |
Output:
Optional: Optional.empty
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Optional.html#empty–
