import java.util.Optional;

public class Task201025 {
    public static void main(String[] args) {
        Optional<String> optional = Optional.of("hello");
        Optional<String> filtered = optional.filter(s -> s.length() > 10);
        Optional<String> mapped = optional.map(s -> null);
        
        System.out.println(filtered.isPresent());
        System.out.println(mapped.isPresent());
        System.out.println(optional.orElse("world"));
        System.out.println(filtered.orElse("java"));
    }
}