$280$

Chapter $6$ Arrays and Array Lists

$36.$ This question is based on the Point class below:

public class Point

$\{$

$/**$ The coordinates. $*$ ereturn the $x-$coordinate of this point $*$ oreturn the $y-$coordinate of this point $*$ Set $x$ and $y$ to nev$\_x$ and nev$\_$y$.$ Oparam pointMat the matrix of points

Precondition: pointMat is initialized with Point objects.

Postcondition: Every point with at least one negative coordinate

has been changed to have both coordinates

equal to zero.

$**$

public static void changeliegs $($Point $[][]$ pointMat$)$

$\{$

$\}$

$/*$ code $*/$

Multiple$-$Choice Questions on Arrays and Array Lists

$281$

Which is a correct replacement for $\frac{?}{?}**$ code $*/?$

I for $($int $r=0$; $r$ pointMat.length; $r+b)$

for $($int $c=0$;$c$ pointMat $r.$ length; $c++)$

if $($pointhat $[$r$][$c$],$ getx$()<mn\; id="EditorElement\_428391">0</mn>$

II pointMat $[r][c]*gety()<mn\; id="EditorElement\_428353">0</mn>$ pointMat $[r][c],$ netPoint $(0,0)$;

II for $($int $c=0$;$c$ pointMat $[0].$ length; c$+$t$)$

for $($int $r=0$;$r$ pointMat.length; $r++)$

$1f($pointhat $[r][c]*gotx()<mn\; id="EditorElement\_428078">0</mn>$

II pointMat $[$r$][$c$].$ gety $()<mn\; id="EditorElement\_428010">0</mn>$ pointMat $[r][c].$ setPoint $(0,0)$ :

III for $($Point $[]$ rou : pointMat$)$

for $($Point $p$ : row$)$

if $($p$.$getx $O<mn\; id="EditorElement\_427855">0</mn>$ II p$.$gety