Final Exam Flashcards

Question 1

Q

Every class definition must include a constructor.
True
False

Question 2

Q

While multiple objects of the same class can exist, in a given program there can be only one version of each class.
True
False

Question 3

Q

A method defined in a class can access the class’ instance data without needing to pass them as parameters or declare them as local variables.
True
False

Question 4

Q

Accessors and mutators provide mechanisms for controlled access to a well-encapsulated class.
True
False

Question 5

Q

All Java classes must contain a main method which is the first method executed when the Java class is called upon.
True
False

Question 6

Q

In Java, the symbol “=” and the symbol “==” are used synonymously (interchangeably).
True
False

Question 7

Q

As in the other members of the C family of languages (C, C++, C#), Java interprets a zero value as false and a non-zero value as true.
True
False

Question 8

Q

In Java, selection statements consist of the if and if-else statements.
True
False

Question 9

Q

When comparing any primitive type of variable, == should always be used to test to see if two values are equal.
True
False

Question 10

Q

The statement if (a >= b) a++; else b–; will do the same thing as the statement if (a < b) b–; else a++;.
True
False

Question 11

Q

An if statement may or may not have an else clause, but an else clause must be part of an if statement.
True
False

Question 12

Q

In order to compare int, float and double variables, you can use , ==, !=, <=, >=, but to compare char and String variables, you must use compareTo( ), equals( ) and equalsIgnoreCase( ).
True
False

Question 13

Q

Control in a switch statement jumps to the first matching case.

True
False

Question 14

Q

Each case in a switch statement must terminate with a break statement.
True
False

Question 15

Q

It is possible to convert any type of loop (while, do, or for) into any other.

True
False

Question 16

Q

The following loop is syntactically valid.

  for (int j = 0; j < 1000; j++) j--;

True
False

Question 17

Q

Given the following assignment statement, which of the following answers is true regarding the order that the operators will be applied based on operator precedence?

a = (b + c) * d / e - f;
  A) *, /, +, -
  B) *, +, /, -
  C) +, *, /, -
  D) +, /, *, -
  E) +, -, *, /

Question 18

Q

For the questions below, assume that boolean done = false, int x = 10, int y = 11, String s = “Help” and String t = “Goodbye”.

The expression (!done && x <= y) is true.

True
False

Question 19

Q

A dialog box is a device which accepts voice commands.
True
False

Question 20

Q

For the questions below, assume that boolean done = false, int x = 10, int y = 11, String s = “Help” and String t = “Goodbye”.

The expression (done | | s.compareTo(t) < 0) is true.
True
False

Question 21

Q

If a language uses 240 unique letters and symbols, how many bits would be

needed to store each character of a document?

a. 1
b. 3
c. 7
d. 8
e. 2

Question 22

Q

Which of the following is not valid Java identifier?

a. Factorial
b. level2
c. hook&ladder
d. highest$

Question 23

Q

Categorize the following as a compile-time error, run-time error, or logical error.

Q6.Multiplying two numbers when you meant to add them

a. logical error
b. run-time error
c. compile-time error

Question 24

Q

Categorize the following as a compile-time error, run-time error, or logical error.

Q6.Multiplying two numbers when you meant to add them

a. logical error
b. run-time error
c. compile-time error

Question 25

Q

Producing inaccurate results

a. logical error
b. run-time error
c. compile-time error

Question 26

Q

Typing a { when you should have typed (

a. logical error
b. run-time error
c. compile-time error

Question 27

Q

Use the following class definition to answer the questions below.

  public class Questions1_4

  {

                public static void main(String[ ] args)

                {

                               System.out.print("Here");

                               System.out.println("There  " + "Everywhere");

                               System.out.println("But  not" + "in  Texas");

                }

  }

The program will print the word “Here” and then print
A) “There Everywhere” on the line after “Here”
B) “There” on the line after “Here” and “Everywhere” on the line after “There”
C) “There Everywhere” on the same line as “Here”
D) “ThereEverywhere” on the same line as “Here”
E) “ThereEverywhere” on the line after “Here”

Question 28

Q

The final println command will output
  A) "But not in Texas"
  B) "But notin Texas"
  C) "But not" on one line and "in Texas" on the next line
  D) "But not+in Texas"
  E) "But not + in Texas"

Question 29

Q

How many lines of output are provided by this program?
  A) 1
  B) 2
  C) 3
  D) 4
  E) 5

Question 30

Q

Consider the following statement:

System.out.println(“1 big bad wolf\t8 the 3 little pigs\n4 dinner\r2night”);

This statement will output \_\_\_\_\_\_\_\_ lines of text
  A) 1
  B) 2
  C) 3
  D) 4
  E) 5

Question 31

Q

The word println is a(n)
  A) method
  B) reserved word
  C) variable
  D) class
  E) String

Question 32

Q

What value will z have if we execute the following assignment statement?

float z = 5 / 10;

  A) z will equal 0.0
  B) z will equal 0.5
  C) z will equal 5.0
  D) z will equal 0.05
  E) none of the above, a run-time error arises because z is a float and 5 / 10 is an int

Question 33

Q

A cast is required in which of the following situations?
A) using charAt to take an element of a String and store it in a char
B) storing an int in a float
C) storing a float in a double
D) storing a float in an int
E) all of the above require casts

Question 34

Q

What is output with the statement System.out.println(x+y); if x and y are int values where x=10 and y=5?

  A) 15
  B) 105
  C) 10 5
  D) x+y
  E) An error since neither x nor y is a String

Question 35

Q

Which of the following would return the last character of the String x?
  A) x.charAt(0);
  B) x.charAt(last);
  C) x.charAt(length(x));
  D) x.charAt(x.length( )-1);
  E) x.charAt(x.length( ));

Question 36

Q

If you want to store into the String name the value "George  Bush", you would do which statement?
  A) String name = "George Bush";
  B) String name = new String("George Bush");
  C) String name = "George" + " " + "Bush";
  D) String name = new String("George" + " " + "Bush");
  E) Any of the above would work

Question 37

Q

Suppose that String name = "Frank  Zappa".  What will the instruction name.toUpperCase( ).replace('A', 'I'); return?
  A) "FRANK ZAPPA "
  B) "FRINK ZIPPI"
  C) "Frink Zippi"
  D) "Frank Zappa"
  E) "FrInk ZIppI"

Question 38

Q

Which library package would you import to use the class Random?
  A) java.beans
  B) java.io
  C) java.lang
  D) java.tex
  E) java.util

Question 39

Q

Examine the following example answers to questions A and B below. Next pick the correct M/C answer at the end.

A. What is a Java Virtual Machine? Explain its role.

Answer: A Java Virtual Machine (JVM) is a software interpreter that executes Java bytecode.

Since bytecode is a low-level representation of a program, but not tied to any particular

hardware architecture, any computer with a JVM can execute Java code, no matter

what machine it was compiled on. That makes Java architecture-neutral, and therefore

highly portable.

B. What do we mean when we say that the English language is ambiguous? Give two examples of English ambiguity (other than the example used in this chapter) and explain the ambiguity. Why is ambiguity a problem for programming languages?

Answer: Something is ambiguous if it has two or more possible meanings. For example, the

statement, “Mary is the nicest teaching assistant who has helped me all day long” might

mean 1) of all the teaching assistants who have helped me today, Mary is the nicest, or

2) of those teaching assistants who have helped me for an entire day, Mary is the
nicest. As another example, the statement, “Bananas help those who help themselves”

might mean 1) bananas are good for those who attend to their own welfare or 2)

bananas are good for those who eat as many bananas as they please. If a

programming language statement could be interpreted in two or more ways, it would be

impossible to predict with certainty how it would be interpreted and what result would

be produced.

M/C answers below:

  A. Both A. and B are true
  B. A is true, but B is false
  C. B is true, but A is false
  D. A is false, but B is true
  E. B is false, but A is true
  F. Both A and B are false

Question 40

Q

The Random class has a method nextFloat( ) which returns a random float value between
  A) -1 and +1
  B) 0 and 1
  C) 0 and 99
  D) 1 and 100
  E) -2,147,483,648 and +2,147,483,647

Question 41

Q

If you want to output a double so that at least 1 digit appears to the left side of the decimal point and exactly 1 digit appears to the right side of the decimal point, which pattern would you give a DecimalFormat variable when you instantiate it?

  A) "0.0"
  B) "0.#"
  C) "0.0#"
  D) "0.##"
  E) "#.#"

Question 42

Q

What value will z have if we execute the following assignment statement?

int z = 50 / 10.00;
  A) 5
  B) 5.0
  C) 50
  D) 10
  E) none of the above, a run-time error arises because z is an int and 50 / 10.00 is not

Question 43

Q

Using getCurrencyInstance( ) formats a variable, automatically inserting
  A) decimal point for cents
  B) dollar sign
  C) percent sign
  D) all three
  E) A and B but not C

Question 44

Q

The relationship between a class and an object is best described as
  A) classes are instances of objects
  B) objects are instances of classes
  C) objects and classes are the same thing
  D) classes are programs while objects are variables
  E) objects are the instance data of classes

Question 45

Q

Which of the following reserved words in Java is used to create an instance of a class?
A) class
B) public
C) public or private, either could be used
D) import
E) new

Question 46

Q

If x is an int where x = 1, what will x be after the following loop terminates?

        while (x < 100)

                  x *= 2;
  A) 2
  B) 64
  C) 100
  D) 128
  E) none of the above, this is an infinite loop

Question 47

Q

Consider a sequence of method invocations as follows:  main calls m1, m1 calls m2, m2 calls m3 and then m2 calls m4, m3 calls m5.  If m4 has just terminated, what method will resume execution?
  A) m1
  B) m2
  C) m3
  D) m5
  E) main

Question 48

Q

In a UML diagram for a class
  A) classes are represented as rectangles
  B) there may be a section containing the name of the class
  C) there may be a section containing the attributes (data) of the class
  D) there may be a section containing the methods of the class
  E) all of the above

Question 49

Q

How many times will the following loop iterate?

        int x = 10;

        while (x > 0)

              {

                    System.out.println(x);

                    x--;

              }

  A) 0 times
  B) 1 time
  C) 9 times
  D) 10 times
  E) 11 times

Question 50

Q

Which of the following are true statements about check boxes?
A) they may be checked or unchecked
B) radio buttons are a special kind of check boxes
C) they are Java components
D) you can control whether or not they will be visible
E) all of the above

Question 51

Q

The idea that program instructions execute in order (linearly) unless otherwise specified through a conditional statement is known as
  A) boolean execution
  B) conditional statements
  C) try and catch
  D) sequentiality
  E) flow of control

Question 52

Q

Of the following if statements, which one correctly executes three instructions if the condition is true?
A) if (x < 0) a = b * 2; y = x; z = a - y;
B) { if (x < 0) a = b * 2; y = x; z = a - y; }
C) if { (x < 0) a = b * 2; y = x; z = a - y ; }
D) if (x < 0) { a = b * 2; y = x; z = a - y; }
E) B, C and D are all correct, but not A

Question 53

Q

Given the nested if-else structure below, answer questions below.

if (a > 0)

      if (b < 0)

            x = x + 5;

      else

            if (a > 5)

                   x = x +4;

            else

                   x = x +3;

else

      x = x + 2;

If x is currently 0, a = 5 and b = 5, what will x become after the above statement is executed?
  A) 0
  B) 2
  C) 3
  D) 4
  E) 5

Question 54

Q

The following nested loop structure will execute the inner most statement (x++) how many times?

        for (int j = 0; j < 100; j++)

              for (int k = 100; k > 0; k--)

                    x++;

  A) 100
  B) 200
  C) 10,000
  D) 20,000
  E) 1,000,000

Question 55

Q

Consider the following code that will assign a letter grade of ‘A’, ‘B’, ‘C’, ‘D’, or ‘F’ depending on a student’s test score.

        if (score >= 90) grade = 'A';

        if (score >= 80) grade = 'B';

        if (score >= 70) grade = 'C';

        if (score >= 60) grade = 'D';

        else grade = 'F';

A) This code will work correctly in all cases
B) This code will work correctly only if grade >= 60
C) This code will work correctly only if grade < 60
D) This code will work correctly only if grade < 70
E) This code will not work correctly under any circumstances

Question 56

Q

Assume that count is 0, total is 20 and max is 1. The following statement will do which of the following? if (count != 0 && total / count > max) max = total / count;

A) The condition short circuits and the assignment statement is not executed
B) The condition short circuits and the assignment statement is executed without problem
C) The condition does not short circuit causing a division by zero error
D) The condition short circuits so that there is no division by zero error when evaluating the condition, but the assignment statement causes a division by zero error
E) The condition will not compile because it uses improper syntax

Question 57

Q

What is wrong, logically, with the following code?

        if (x > 10) System.out.println("Large");

        else if (x > 6 &amp;&amp; x <= 10) System.out.println("Medium");

        else if (x > 3 &amp;&amp; x <= 6) System.out.println("Small");

        else System.out.println("Very small");

A) There is no logical error, but there is no need to have (x <= 10) in the second conditional or (x <= 6) in the third conditional
B) There is no logical error, but there is no need to have (x > 6) in the second conditional or (x > 3) in the third conditional
C) The logical error is that no matter what value x is, “Very small” is always printed out
D) The logical error is that no matter what value x is, “Large” is always printed out
E) There is nothing wrong with the logic at all

Question 58

Q

Consider the following outline of a nested if-else structure which has more if clauses than else clauses. Which of the statements below is true regarding this structure?

        if (condition1)

              if (condition2)

                          statement1;

        else  statement2;

A) syntactically it is invalid to have more if clauses than else clauses
B) statement2 will only execute if condition1 is false and condition2 is false
C) statement2 will only execute if condition1 is true and condition2 is false
D) statement2 will only execute if condition1 is false, it does not matter what condition2 is
E) statement2 will never execute

Question 59

Q

Assume that x and y are int variables with x = 5, y = 3, and a and d are char variables with a = ‘a’ and d = ‘A’, and examine the following conditions:

        Condition 1:  (x < y &amp;&amp; x > 0)

        Condition 2:  (a != d || x != 5)

        Condition 3:  !(true &amp;&amp; false)

        Condition 4:  (x > y || a == 'A' || d != 'A')

A) All 4 Conditions are true
B) Only Condition 2 is true
C) Condition 2 and Condition 4 are true only
D) Conditions 2, 3 and 4 are all true, Condition 1 is not
E) All 4 Conditions are false

Question 60

Q

Every Interator

  A) has a hasNext( ) method
  B) has a hasFirst( ) method
  C) has a hasNextInt( ) method
  D) has a isEmpty( ) method
  E) none of the above

Question 61

Q

If x is an int where x = 0, what will x be after the following loop terminates?

        while (x < 100)

              x *= 2;

  A) 2
  B) 64
You Answered
  C) 100
  D) 128
  E) none of the above, this is an infinite loop

Question 62

Q

Given the following switch statement where x is an int, answer the questions below

 switch (x)

 {

      case 3 : x += 1;

      case 4 : x += 2;

      case 5 : x += 3;

      case 6 : x++;

      case 7 : x += 2;

      case 8 : x--;

      case 9 : x++

 }

4) If x is currently equal to 5, what will the value of x be after the switch statement executes?
You Answered
  A) 8
  B) 6
  C) 11
  D) 5
  E) 10

Question 63

Q

The statement if (x < 0) y = x; else y = 0; can be rewritten using a conditional operator as

  A) y = (x < 0) ? x : 0;
  B) x = (x < 0) ? y : 0;
  C) (x < 0) ? y = x : y = 0;
  D) y = (x < 0);
  E) y = if (x < 0) x : 0;

Question 64

Q

How many times will the following loop iterate?

        int x = 10;

        do  {

                    System.out.println(x);

                    x--;

              } while (x > 0);

  A) 0 times
  B) 1 time
  C) 9 times
  D) 10 times
  E) 11 times

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Final Exam Flashcards

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