java: Determine the distance between point $($x$1,$ y$1)$ and point $($x$2,$ y$2),$ and assign the result to pointsDistance. The calculation is:

Distance $=$ SquareRootOf$(($x$2-$ x$1)2+($y$2-$ y$1)2)$

You may declare additional variables.

Ex: For points $(1\mathrm{.}0,2\mathrm{.}0)$ and $(1\mathrm{.}0,5\mathrm{.}0),$ pointsDistance is $3\mathrm{.}0.$