/* package whatever; // don't place package name! */
 
import java.util.stream.*;
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Optional<Long> opt1 = Optional.of(13l);
		Optional<String> opt2 = Optional.empty();
		Optional<String> opt3 = Optional.of("something");
 
		Stream<Optional> fields = Stream.of(opt1, opt2, opt3);
	    	List<String> result = fields.map(o -> o.orElse("")).map(o -> o.toString()).collect(Collectors.toList());
	    	System.out.println(result);
	}
}

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