What is the importance of Optional.or() method in Java 9?

##In Java 9, some static methods have been added to the

Optional class:stream(), or() andifPresentOrElse() . The introduction of theOptional class solves thenull pointer exception problem. The

Optional.or()method returns anOptionaldescribing a value that is returned if present, otherwise an Optional generated by the provided function.

public Optional or(Supplier> supplier)

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import java.util.Optional; import java.util.function.Supplier; public class OptionalOrTest { public static void main(String args[]) { Optional optional = Optional.of("TutorialsPoint"); Supplier> supplierString = () -> Optional.of("Not Present"); optional = optional.or(supplierString); optional.ifPresent(x -> System.out.println("Value: " + x)); optional = Optional.empty(); optional = optional.or(supplierString); optional.ifPresent(x -> System.out.println("Value: " + x)); } }

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Value: TutorialsPoint Value: Not Present

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