In the file Dril$12.$ java, add the following class definitions $($you can copy$/$paste them from here$)$:

class C$1\{$

C$2$ other;

C$1($ C$2$ other$)\{$

this. other $=$ other;

$\}$

$\}$

class $C2\{$

int $x$;

double $y$;

C$2($int $x,$ double $y)\{$

this. $x=x$;

$\}$

this. $y=y$;

$\}$

Then add a class definition called Drill$2$ with the following fields:

A field named first of type $C2$ with its $x$ field equal to $10,$ and $y$ field should be $3\mathrm{.}5$

A field named second of type C$1.$ It's value should be a reference to a C$1$ object with its other field set to any C$2$ object other than the one stored in first $($you can create another C$2$ object for this$).$

A field named third of type C$1.$ It's value should be a reference to a C$1$ object with its other field the same $C2$ object as the one stored in the first field.