CS$1073$ Practice Q$$estions

Question $1$: Determine the output

public class Q$1\{$

public static char$[]$ myMethod$($int $[]$ data$)\{$

char $[]$ result $=$ new data. length$]$;

for$($int $i=0$;$i$ data. length; $i++$

if data $[i]\%2==0$

result $[i]=\text{'}Y\text{'}$;

$\}$

else$\{$

$\}$

result $[i]=\text{'}N\text{'}$;

$\}$

return result;

$\}$

public static void main$($String$[]$ args$)\{$

int $[]$ arrA$=\{1,2,3\}$;

char$[]arrB=$myMethod$(arrA)$;

System.out.print $(arrB[]+$cdotscdots$+$arrB$[1]+$cdots$+$arrB$[2])$;

$\}$

$\}$

Question $2$:

Given two class: ClassTwo is a subclass of ClassOne $($ClassTwo extends ClassOne$).$ Each class has the following method signatures:

ClassOne

public void methodA$($double $n,$ String $s)$

public double methodB$($int $x)$

public String methodC$($double $y)$

public String methodC$($String s$)$

ClassTwo extends ClassOne

public double methodB$($String $x)$

public String methodD$($String s$)$

Determine which of the following statements are valid $/$ invalid given two objects; myObjectOne of type ClassOne and myObjectTwo of type ClassTwo:

ClassOne myObjectOne $=$ new ClassOne$()$;

ClassTwo myObjectTwo $=$ new ClassTwo$()$;

a$.)$ double answer $=$ myObjectOne.methodC$(3\mathrm{.}75)$;

b$.)$ myObjectTwo.methodA $,"2\mathrm{.}0")$;

d$.)$ System.out.printIn$($myObjectOne$.$methodC$($myObjectTwo$.$methodB$(5))$; $-$