What is the output of the following code?

a$.$ Will the code give any error? If yes, what is the error? Is it a Compilation error or Runtime error? Why?

b$.$ How can you fix it$?$

import java.util.Map;

public class Main $\{$

Map namesMap;

public void addName$($String name, String course$)\{$

namesMap.put$($name$,$ course$)$;

$\}$

public Map getNames$()\{$

return namesMap;

$\}$

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

Main m $=$ new Main$()$;

m$.$addName$("$Chris$",$ "OOP"$)$;

$//$ Hint: there are no issues in the lines below

for $($Map$.$Entry entry : m$.$getNames$().$entrySet$())\{$

System.out.println$($entry$.$getKey$()+""+$ entry.getValue$())$;

$\}$

$\}$

$\}$