In relation to object oriented programming.

$1\mathrm{.}1$ Does every object have a toString method and an equals method? Where do they come from? How are they used? Is it appropriate to override these methods?

$1\mathrm{.}2$ Explain the difference between Array and ArrayList.

$1\mathrm{.}3$ What modifier should you use on a class so that a class in the same package can access it$,$ but a class in a different package cannot access it$?$

$1\mathrm{.}4$ What modifier should you use so that a class in a different package cannot access the class, but its subclasses in any package can access it$?$

$1\mathrm{.}5$ How do you prevent a class from being extended? How do you prevent a method from being overridden?