OSU CSE 2221 FINAL REVIEW 2024 QUESTIONS AND ANSWERS

OSU CSE 2221 FINAL REVIEW

Which statement correctly defines a java constant?



*a.* const SPECIAL = 1234;

*b.* int SPECIAL = 1234;

*c.* int final SPECIAL = 1234;

*d.* final int SPECIAL = 1234;

*e.* const int SPECIAL = 1234; - ANSWERS-d



What is the value of s after the following statement:



String s = (!true) + " : " + (10 + 4) + " is 104";



*a.* "!true : 104 is 104"

*b.* "false : 104 is 104"

*c.* "!true : 14 is 104"

*d.* "false : 14 is 104"

*e.* This is a compile-time error - ANSWERS-d



The correct syntax for the "main" method signature is:

,*a.* private static void main(String[] args)

*b.* public static String main(String[] args)

*c.* public static void main(String[] args)

*d.* public void main(String[] args)

*e.* none of the above - ANSWERS-c



The Java compiler does the following:



*a.* checks a bytecode program in a ".class" file for run-time errors and if there
are none, it generates source code for that program in a ".java" file

*b.* checks a source code program in a ".java" file for run-time errors and if there
are none, it generates bytecode for that program in a ".class" file

*c.* checks a source code program in a ".java" file for compile-time errors and, if
there are none, it generates bytecode for that program in a ".class" file

*d.* checks a bytecode program in a ".class" file for compile-time errors and if
there are none, it generates source code for that program in a ".java" file

*e.* none of the above - ANSWERS-c




The Checkstyle plugin for Eclipse is useful because:



*a.* it warns you of potential compile-time errors

,*b.* it helps you make your code understandable for yourself and other
programmers

*c.* it prevents your code from making errors caught by assert statements

*d.* it tells you when code you have written does not obey its contract

*e.* none of the above - ANSWERS-b



If x is an int variable, when does the boolean expression evaluate to true?



((x % 5 != 0) && (x % 2 != 0))



*a.* when x is divisible by 5 or by 2 but not by both

*b.* when x is divisible by 10

*c.* when x is not divisible by 10

*d.* when x is neither divisible by 5 nor by 2

*e.* when x is either divisible by 5 or by 2 - ANSWERS-d



The nextDouble( ) method of r, a variable of type Random, returns a double in a
range of [0,1). Which of these expressions would you use to create a random
number in the range of [-3,3)?



*a.* r.nextDouble( ) * 3.0 - 3.0

*b.* (r.nextDouble( ) - 0.5) * 6.0

*c.* r.nextDouble( ) * 6.0 + 3.0

, *d.* r.nextDouble( ) * 6.0 + 0.5

*e.* (r.nextDouble( ) - 3.0) * 6.0 - ANSWERS-b



Consider the following code fragment:



int x = 8;

while ((x / 3) != 2) { x = x - 1; }



How many times will the body of the loop execute?



*a.* 0

*b.* 1

*c.* 2

*d.* 3

*e.* the loop will never terminate - ANSWERS-a



Consider the following method signature:



private static int examScore(int studentNum) {...}



Here, studentNum is called: