A null value can be useful to model an optional value that may or may not be present. The following Name class sets last to null when a name is constructed without a last name. Rearrange the lines to produce the code for the class. First show the instance variables.

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Unused

first $=$ fname;

if $($ last $==$ null$)$ return first; $\}$

last $=$ lname;

private String first;

else return last $+","+$ first; $\}$

private String last;

last $=$ null;

first $=$ fname;

Name.java

Load default template...

import java.util.Scanner;

public class Name

$\{$

public Name$($String fname$)$

$\{$

$\}$

public Name$($String fname, String lname$)$

$\{$

$\}$

public String tostring$()$

$\{$

$\}$

public static void main $($String $[]$ args$)$

$\{$

Scanner in $=$ new Scanner$($

System.in$)$;