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import java.util.Optional;

public class Test {

	public static void main(String[] args) {

		String str = null;
//		System.out.println(str.length());  // java.lang.NullPointerException

		Optional<String> strOpt = Optional.ofNullable(str);
		
		if(strOpt.isPresent()) {
			String message = strOpt.get();
			System.out.println(message.length());
		}
		
		strOpt.ifPresent(v -> System.out.println(v.length()));
	}

}