FAQ: String Methods - concat()

This community-built FAQ covers the “concat()” exercise from the lesson “String Methods”.

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There are a few solutions to this that seem like they should work but don’t for some reason.
The first solution I used was

String firstName = "Bob";  

String lastName = " Ross";

String fullName = firstName.concat(lastName);

System.out.println(fullName);

Which prints “Bob Ross” as expected. I then tried changing lastName to…

String lastName = " " + "Ross";

…which prints correctly and then tried changing the concat method to…

String fullName = firstName.concat(" " + lastName);

…which also prints correctly.

I believe I know what it wants me to put into the code…

System.out.println(firstName.concat(" " + lastName));

…but it seems weird that 3 seemingly valid solutions were rejected. Maybe it’s just because I’m new to coding so they only seem right to me but actually aren’t? I can kind of understand why the first two solutions wouldn’t be acceptable though why not the 3rd?

public class CombineNames {

public static void main(String[] args) {

// Add your first names:
String firstName = "My";  
String lastName = "Name";

// What's the full name?
System.out.println(firstName.concat(" " + lastName));

That is my answer