anime-line: EXAM 2

View Assessment Result: Exam 2 Multiple-Choice

Your performance was as follows:

1. Upon compilation, the source code of a Java class MyClass will be stored in the file _____, and the corresponding byte code will be stored in the file _____.

(a) MyClass.class, MyClass.exe
(b) MyClass.java, MyClass.exe
(c) MyClass.class, MyClass.java
(d) MyClass.java, MyClass.class

Correct answer is

(d)

Your score on this question is:

5.00

Feedback:

See sections 2.1.2 and 2.1.3 in the course notes.

Model elements in Java programs that share a common behavior can be grouped into categories called

(a) codes
(b) classes
(c) programs
(d) objects

Correct answer is

(b)

Your score on this question is:

5.00

Feedback:

See Chapter 1, page 3, in the course textbook.

In addition to coding, the process of programming model involves which of the following?

Evaluation and testing
Defining and redefining a problem
Planning a solution to a problem

(a) None
(b) I only
(c) I, II, and III
(d) II and III only

Correct answer is

(c)

Your score on this question is:

5.00

Feedback:

All of these are part of the programming process. See section 2.1.6 in the course notes.

Valid Java comments include which of the following?

/* this is an /* embedded */ comment */
/* this is an // embedded // comment */
// this is a comment */

(a) I only
(b) II and III only
(c) I and II only
(d) I and III only

Correct answer is

(b)

Your score on this question is:

0.00

Feedback:

See section 2.1.3, subsections "The Catfish Class," in the course notes.

5. A Java servlet can obtain an object for sending data to the client of the servlet by calling which of the following methods of HttpServletResponse?

(a) encodeURL
(b) setContentType
(c) getCharacterEncoding
(d) getWriter

Correct answer is

(d)

Your score on this question is:

5.00

Feedback:

See section 2.1.4, subsection "The Welcome Servlet," in the course notes.

Which of the statements below correctly constructs an object using the following constructor?

Plane(int a, int b, int c)
{
   // code
}

(a) p = Plane;
(b) p = Plane(1, 2, 3);
(c) p = new Plane(1, 2, 3);
(d) p = new Plane;

Correct answer is

(c)

Your score on this question is:

5.00

Feedback:

See sections 2.2.4 and 2.2.6 in the course notes. Refer to the manner in which the constructors for the HtmlPage and AlgaeColony classes are implemented.

Which of the following is (are) consistent with Java naming conventions regarding capitalization?

int numPeople;
int Counter;
class serviceElevator{}

(a) I and III only
(b) None
(c) I, II, and III
(d) I only

Correct answer is

(d)

Your score on this question is:

5.00

Feedback:

See section 2.2.2, subsection "Mapping English Terms to Java Terms," in the course notes.

The following line can be the start of

public void paint(Graphics  g)

(a) a method definition
(b) a variable declaration
(c) a class definition
(d) a method call

Correct answer is

(a)

Your score on this question is:

5.00

Feedback:

See section 2.2.2 through 2.2.4 in the course notes.

In Java, variables declared in the body of a method are known as _____ variables.

(a) instance
(b) class
(c) public
(d) local

Correct answer is

(d)

Your score on this question is:

5.00

Feedback:

See Chapter 4, page 122, in the course textbook.

10.

In Java, non-sequential execution of code is achieved by using _____ statements.

(a) ordering
(b) branching
(c) concurrent
(d) control

Correct answer is

(d)

Your score on this question is:

5.00

Feedback:

See sections 2.3.4 and 2.3.5 in the course notes.

11.

The type of the number 2.0 in Java can be

(a) int
(b) Panel
(c) boolean
(d) double

Correct answer is

(d)

Your score on this question is:

5.00

Feedback:

See section 2.3.1 in the course notes.

12.

A Java Virtual Machine (JVM) is

(a) hardware that interprets Java bytecode
(b) a compiler that generates Java bytecode
(c) software that interprets Java bytecode
(d) a decompiler that creates Java source code from Java bytecode

Correct answer is

(c)

Your score on this question is:

0.00

Feedback:

See section 2.1.2 in the course notes.

13.

How many times will the following loop execute?

int  i;
for (i = 0; i < 9; i = i + 1)
    i = 8;

(a) 1
(b) 2
(c) infinitely many
(d) 9

Correct answer is

(a)

Your score on this question is:

5.00

Feedback:

See section 2.3.5 of the course notes.

14.

Assume you are given a method with a specification


    double numbers();

that supplies you with numbers from the user's input. You need to find the first input number from user input that is smaller than 0.5 and put it in the variable x. Which of the following can be used for that purpose?

double x = numbers(); while (x <= 0.5) x = numbers();
double x = 0.1; while (x >= 0.5) x = numbers();
double x; for (x = numbers(); x >= 0.5; x = numbers());

(a) II and III only
(b) I, II and III
(c) III only
(d) I only

Correct answer is

(c)

Your score on this question is:

5.00

Feedback: The first item sets x to the first number greater than 0.5; the second item never gets user input. See section 2.3.5 of the course notes.

15.

In Java, for primitives, the assignment operator is the symbol _____ and the equality operator is the symbol _____.

(a) =, ==
(b) ==, =
(c) =, equals()
(d) :=, =

Correct answer is

(a)

Your score on this question is:

5.00

Feedback:

See sections 2.3.2 and 2.3.3 in the course notes.

16.

Consider the following code fragment.

int m = 3;
int n = m / 2;

What is the value of n?

(a) 1.5
(b) 2
(c) 1
(d) 1.0

Correct answer is

(c)

Your score on this question is:

5.00

Feedback:

Integer division truncates. See section 2.3.2 in the course notes.

17.

If T represents the value true and F represents the value false, what does the following expression evaluate to?

! ( ( T || F ) && !F )

(a) There is an error in the expression so the program containing this expression cannot be compiled.
(b) The expression cannot be evaluated based on the information presented.
(c) false
(d) true

Correct answer is

(c)

Your score on this question is:

5.00

Feedback:

Using the precedence of the operators and the parentheses in the expression, it can be evaluated like this:

 ! ( ( T || F ) && !F ) ! ( ( T ) && T ) ! ( T && T ) ! ( T ) F

See section 2.3.3 in the course notes.

18.

In Java, the scope of a parameter of a method contains the scope of which of the following?

(a) Instance variables of the method
(b) Class variables of the method
(c) Local variables of the method
(d) Global variables of the method

Correct answer is

(c)

Your score on this question is:

5.00

Feedback:

See section 2.3.1 in the course notes.

19.

In the class defined below

class MyClass {
    int age = 19;
    void myMethod()
    {
        int counter;
    }
}

(a) both age and counter are local variables
(b) both age and counter are instance variables
(c) age is an instance variable and counter is a local variable
(d) age is a local variable and counter is an instance variable

Correct answer is

(c)

Your score on this question is:

5.00

Feedback:

See section 2.3.1 of the course notes.

20. Which of the following is a method invocation that retrieves the first element from an instance of class java.util.Vector?

(a) elementAt(0)
(b) read(0)
(c) elementAt(1)
(d) read(1)

Correct answer is

(a)

Your score on this question is:

0.00

Feedback:

See Chapter 9, page 335, in the course textbook.

Go to top of assessment.

Total score: 85.00

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Friday, May 25, 2012

EXAM 2

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