$//$ Proj$12$Runner.java

class Proj$12$Runner $\{$

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

System.out.println$("$I certify that this program is my own work and is not the work of others. $"+$

"I agree not to share my solution with others. Replace this line with your name $=====$This line is required$=====")$;

Animal cat $=$ new Cat$()$;

System.out.println$($cat$.$speak$())$;

Animal dog $=$ new Dog$()$;

System.out.println$($dog$.$speak$())$;

Animal cow $=$ new Cow$()$;

System.out.println$($cow$.$speak$())$;

$\}$

$\}$

class Cat implements Animal $\{$

@Override

public String speak$()\{$

return "I am a cat.

Meow";

$\}$

@Override

public void sleep$()\{$

$//$ Implement sleep for Cat

$\}$

@Override

public int run$()\{$

$//$ Implement run for Cat

return $0$;

$\}$

$\}$

class Dog implements Animal $\{$

@Override

public String speak$()\{$

return "I am a dog.

Woof";

$\}$

@Override

public void sleep$()\{$

$//$ Implement sleep for Dog

$\}$

@Override

public int run$()\{$

$//$ Implement run for Dog

return $0$;

$\}$

$\}$

class Cow implements Animal $\{$

@Override

public String speak$()\{$

return "I am a cow.

Moo";

$\}$

@Override

public void sleep$()\{$

$//$ Implement sleep for Cow

$\}$

@Override

public int run$()\{$

$//$ Implement run for Cow

return $0$;

$\}$

$\}$