The orElse() method of java.util.Optional class in Java is used to get the value of this Optional instance, if present. If there is no value present in this Optional instance, then this method returns the specified value.
Syntax:
public T orElse(T value)
Parameters: This method accepts value as a parameter of type T to return if there is no value present in this Optional instance.
Return value: This method returns the value of this Optional instance, if present. If there is no value present in this Optional instance, then this method returns the specified value.
Below programs illustrate orElse() method:
Program 1:
// Java program to demonstrate// Optional.orElse() 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);          // orElse value        System.out.println("Value by orElse"                           + "(100) method: "                           + op.orElse(100));    }} |
Output:
Optional: Optional[9455] Value by orElse(100) method: 9455
Program 2:
// Java program to demonstrate// Optional.orElse() 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 {              // orElse value            System.out.println("Value by orElse"                               + "(100) method: "                               + op.orElse(100));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
Optional: Optional.empty Value by orElse(100) method: 100
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Optional.html#orElse-T-
