Java Exam

QUESTION $1$

What is wrong in the following code?

class $Y\{$

int $i$;

public Y$($int i$)\{$

$i=$ this. $i$;

$\}$

$\}$

public class

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

$Yy=$ new $Y(2)$;

$\}$

$\}$

A$.$ The program has a compilation error because $Y$ does not have a default constructor.

B$.$ The program has a compilation error because $Y$ does not have a constructor with an int

argument.

C$.$ The definition of the constructor should be $i=$ this. $i$;

D$.$ Constructor of $Y$ can not take argument named $i,$ as the class has a member named $i.$

QUESTION $2$

Analyze the following code:

public class Test $\{$

static double radius;

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

final double $\frac{?}{PI}=3\mathrm{.}15169$;

double area $=$ radius $*$ radius $*\frac{?}{PI}$ ;

System.out.printIn$("$Area is $"+$ area$)$;

$\}$

$\}$

A$.$ The program has compile errors because the variable radius is not initialized.

B$.$ The program has a compile error because a constant $\frac{?}{PI}$ is defined inside a method.

C$.$ The program has no compile errors but will get a runtime error because radius is not

initialized.

D$.$ The program compiles and runs fine but the area will be always $0.$