$1\mathrm{.}1$ Explain the following Java words. For each write a sentence giving an overview of what the word is about, then either write a second senterke that shows how it fits in with related concepts or write a small code$-$fragment to illustrate its purpose:

$($a$)$ import;

$($b$)$ assert;

$($c$)$ boolean;

$($d$)$ break;

$($e$)$ byte;

$($f$)$ case;

$($g$)$ catch;

$($h$)$ extends;

$($i$)$ new;

$($j$)$ null.