QUESTION $1$

Analyze the following code:

public class A $\{$

int $a$;

public A$($int a$)\{$

System.out.println$($a$)$;

$\}$

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

A test;

System.out.println$($test$.$a$)$;

$\}$

$\}$

The program has a compile error because a is not public.

The program has a compile error because a has not been initialized.

The program has a compile error because you cannot create an object from the class that defines the object.

The program has a compile error because A does not have a default constructor.

The program has a runtime NullPointerException because test is null while executing test.x