$($a$)$ Consider the following classes:

public class Bird $\{$

public int sp$2($Object o$,$

Bird

b$)\{$

return $1$;

protected double sp$2($Bird b$)\{$

return $2$; $\}$

int sp$2($java$.$util.Scanner s$)\{$

return $3$; $\}$

private boolean sp$2($int i$)\{$

return true; $\}$

public int sp$2($Object o$,$

String s$)\{$

return o$.$hashCode$()$; $\}$

public int sp$2($String s$,$

Object o$)\{$return

$4$;

$\}$

$\}$

public class Jay extends Bird $\{$

public int sp$2($String $x,$

String y$)$

$\{$return $5$; $\}$

private int sp$2($double d$)\{$

return $6$; $\}$

boolean sp$2($Jay j$,$ long i$)\{$

return true; $\}$

protected long sp$2($Jay j$,$ int i$)\{$

return $7$ ; $\}$

public int sp$2($Object sp$2,$

Bird b$)\{$return $8$;

$\}$

$\}$

List the method signatures of methods named sp$2$ that are made available by

the public interface of class Jay.

$($b$)$ You are told by your boss to add runtime error checking to your code. When is

it better to throw an exception, and when is it better to use an assert statement?

For both cases, give a suitable example and explain why the chosen approach is

more appropriate for the example.