package com.zetcode; import java.util.Arrays; import java.util.Optional; public class OptionalIsPresentGet { public static void main(String[] args) { var words = Arrays.asList("rock", null, "mountain", null, "falcon", "sky"); for (String s : words) { Optional word = Optional.ofNullable(s); if (word.isPresent()) { System.out.println(word.get()); } else { System.out.println("Invalid value"); } } } }