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CSE 2221 Final Exam Review| Study Questions with 100% Correct Verified Answers
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CSE 2221 Final Exam Review| StudyQuestions with 100% Correct Verified
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Which is true of JUnit testing when the unit under test is a single method?
A. Very thorough JUnit testing can prove the correctness of the method body.
b. JUnit testing is generally considered an expensive waste of time in industry
c. A single JUnit test case can show the presence of a defect in the method body.
d. A single JUnit test case can show the absence of defects in the method body, at least for
the particular choice of inputs in that test case - ANSWER c. A single JUnit test case can show
the presence of a defect in the method body.
After execution of the following code, what are the declared type (static type) and the object
type (dynamic type) of nCopy?
NaturalNumber n = new NaturalNumber1L();
NauturalNumber nCopy=new NaturalNumber2(n);
a. Declared type is NaturalNumber, object type is NaturalNumber1L
b. Declared type is NaturalNumber, object type is NautralNumber2
c. Declared type is NaturalNumber2, object type is NaturalNumber1L
,d. Declared type is NaturalNumber2, object type is NaturalNumber - ANSWER b. Declared type
is NaturalNumber, object type is NautralNumber2
If you write class C implements interface I, the Java compiler checks:
a. Whether I overrides all the methods of C
b. Whether C inherits all the methods of I
c. Whether each method in I has a method body in C
d. Whether each method body in C is a correct implementation of the contract for that method
in I - ANSWER c. Whether each method in I has a method body in C
Consider the following code:
int x=80;
if (x>70){
x=40;
}else if (x<90){
x=20;
}
if (x>30){
x=60;
}
a. 20
b. 40
c. 60
d. 80 - ANSWER C. 60
In design-by-contract, the code responsible for making sure the precondition (requires clause)
is true when a method is called is:
a. the code that implements the method
, b. the client code that calls the method
c. both the client and the implementation code
d. neither the client nor the implementation code - ANSWER b. the client code that calls
the method
Suppose you want want to set teh double variable value to a random real number
uniformly distributed in the interval [-2.0, 2.0). You have made the following declaration:
Random r=new Random1L();
noting that r.nextDouble() returns a random real number uniformly distributed in the interval
[0.0, 1.0). Which statement will set value to the desired result?
a. value=-2.0 * r.nextDouble();
b. value=-2.0+2.0*r.nextdouble();
c. value= 4.0*r.nextDouble()-2.0;
d. value=-2.0 *r.nextDouble() + 2.0*r.nextDouble() - ANSWER c. value= 4.0*r.nextDouble()-2.0;
Consider the following method header:
private static boolean isPrime(int x)
and the call:
boolean answer=isPrime(number);
In this context:
a. x is a formal parameter and number is an argument(or actual parameter)
b. x is an argument (or actual parameter) and number is a formal parameter
c. x is a local variable and number is a distinguished variable
d. both x and number are global variables - ANSWER a. x is a formal parameter and number is
an argument(or actual parameter)
If a and b are boolean variables, when does the expression (!a||!b) evaluate to false?
a. when either a or b is true, but not both
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