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- import java.util.Optional;
- public class Java9OptionalTrial {
- public static void main(String[] args) {
- new Java9OptionalTrial().ifPresentTrial();
- }
- public void ifPresentTrial() {
- present().ifPresentOrElse(
- s -> System.out.println(s),
- () -> System.out.println("not present")
- );
- notPresent().ifPresentOrElse(
- s -> System.out.println(s),
- () -> System.out.println("not present")
- );
- }
- private Optional<String> present() {
- return Optional.of("present");
- }
- private Optional<String> notPresent() {
- return Optional.empty();
- }
- }
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