import java.nio.file.Path; import java.nio.file.Paths; import java.util.Arrays; import java.util.Optional; import java.util.stream.Stream; public class StreamDemo { public static void main(String[] args) { String[] arr = new String[]{"a", "b", "2000"}; Stream stringStream = Arrays.stream(arr); stringStream.map(l -> l) .forEach(System.out::println); Optional intD = Optional.of(1); int data = intD.orElse(0); System.out.println(data); // Path p = Paths.get("/home", "kim", "myapp.properties"); } }