Question 1

Assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". Then the expression (done || s.compareTo(t) < 0) is true.

Accepted Answer

A) True 
 B)False  False

Question 2

String s1 is said to overlap String s2 if all of the characters in s1 also appear in s2. Write a set of code that will set the boolean variable overlap to true if s1 overlaps s2 and false otherwise. Assume both s1 and s2 have already been input.

Accepted Answer

boolean overlap = True;
int j = 0;
while (overlap && j < s1.length())
{
boolean found = False;
int k = 0;
while (!found && k < s2.length())
if (s2.charAt(k) == s1.charAt(j))
found = True;
else k++;
if (!found) overlap = False;
j++;
}

Question 3

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().

Accepted Answer

A) True 
 B)False  False

Question 4

A truth table shows, for the various true or false values of boolean variables, what the result of a boolean condition is. Fill in the following truth table. Assume that a, b and c are boolean variables.
$\begin{array}{lll}
\text { a } & b & c &!(a ~\&\&~ b)~||~!(a ~\&\&~ c)\
\text { false } & \text { false } & \text { false } \
\text { false } & \text { false } & \text { true } \
\text { false } & \text { true } & \text { false } \
\text { false } & \text { true } & \text { true } \
\text { true } & \text { false } & \text { false } \
\text { true } & \text { false } & \text { true } \
\text { true } & \text { true } & \text { false } \
\text { true } & \text { true } & \text { true }
\end{array}$

Accepted Answer

The answer of A truth table shows, for the various...

Question 5

Every iterator

Accepted Answer

A)  has a hasNext() method 
B)  has a hasFirst()method 
C)  has a hasNextInt()method 
D)  has a isEmpty()method 
E)  None of these 
A)  has a hasNext() method 
B)  has a hasFirst()method 
C)  has a hasNextInt()method 
D)  has a isEmpty()method 
E)  None of these

Question 6

The following code has a syntax error immediately before the word else. What is the error and why does it arise? Fix the code so that this statement is a legal if-else statement.
if (x < 0); x++;
else x--;

Accepted Answer

The error is "else without if" and it ar

Question 7

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;

Accepted Answer

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. 
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 8

Of the following if statements, which one correctly executes three instructions if the condition is true?

Accepted Answer

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 
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 9

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

Accepted Answer

A) True 
 B)False

Question 10

Code Segment Ch 05-1
if (a > 0)
   if (b  5)
         x = x + 4;
      else
         x = x + 3;
else
   x = x + 2;

-Refer to Code Segment Ch 05-1. If x is currently 0, a = 5 and b = 5, what will x become after the statement shown is executed?

Accepted Answer

A)  0 
B)  2 
C)  3 
D)  4 
E)  5 
A)  0 
B)  2 
C)  3 
D)  4 
E)  5

Question 11

Which of the following are true about check boxes?

Accepted Answer

A)  They may be checked or unchecked. 
B)  You can allow more than one check box to be checked by the user at a given time. 
C)  Check boxes are Java components. 
D)  You can control whether they will be visible or not. 
E)  All of these are true about check boxes 
A)  They may be checked or unchecked. 
B)  You can allow more than one check box to be checked by the user at a given time. 
C)  Check boxes are Java components. 
D)  You can control whether they will be visible or not. 
E)  All of these are true about check boxes

Question 12

Which type of GUI control would be best to use if you wanted the user to select one date from a list of three possible dates to take an exam?

Accepted Answer

A)  check boxes because they are used for mutually exclusive options 
B)  radio buttons because they are used for mutually exclusive options 
C)  either check boxes or radio buttons because either are used for mutually exclusive options 
D)  neither check boxes nor radio buttons can be used for mutually exclusive options 
E)  There is no way to force a user to select only one option from a list; this must be done with a text input box. 
A)  check boxes because they are used for mutually exclusive options 
B)  radio buttons because they are used for mutually exclusive options 
C)  either check boxes or radio buttons because either are used for mutually exclusive options 
D)  neither check boxes nor radio buttons can be used for mutually exclusive options 
E)  There is no way to force a user to select only one option from a list; this must be done with a text input box.

Question 13

Assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". Then the expression (s.concat(t).length() < y) is true.

Accepted Answer

A) True 
 B)False

Question 14

What does the break statement do?

Accepted Answer

A)  ends a program 
B)  transfers control out of the current control structure such as a loop or switch statement 
C)  ends the current line of output, returning the cursor 
D)  denotes the end of a switch statement 
E)  indicated the end of a line when using System.out.print 
A)  ends a program 
B)  transfers control out of the current control structure such as a loop or switch statement 
C)  ends the current line of output, returning the cursor 
D)  denotes the end of a switch statement 
E)  indicated the end of a line when using System.out.print

Question 15

If x is an int where x = 1, what will x be after the following loop terminates? while (x < 100)
X *= 2;

Accepted Answer

A)  2 
B)  64 
C)  100 
D)  128 
E)  None of these; this is an infinite loop 
A)  2 
B)  64 
C)  100 
D)  128 
E)  None of these; this is an infinite loop

Question 16

If a break occurs within the innermost loop of a nested loop that is three levels deep

Accepted Answer

A)  just the innermost loop will be "broken" 
B)  all loops are "broken" and execution continues from after the end of the loop 
C)  all but the outermost loops are "broken" and execution continues from the next iteration of the outermost loop 
D)  a syntax error is generated unless there are break or continue statements at each loop level 
E)  None of these are true 
A)  just the innermost loop will be "broken" 
B)  all loops are "broken" and execution continues from after the end of the loop 
C)  all but the outermost loops are "broken" and execution continues from the next iteration of the outermost loop 
D)  a syntax error is generated unless there are break or continue statements at each loop level 
E)  None of these are true

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0?

Accepted Answer

A) if (x > 0) x++; Else x--; B) if (x > 0) x++; Else if (x 0) x++; If (x < 0) x--; Else x = 0; D) if (x == 0) x = 0; Else x++; X--; E) x++; X--; A) if (x > 0) x++; Else x--; B) if (x > 0) x++; Else if (x 0) x++; If (x < 0) x--; Else x = 0; D) if (x == 0) x = 0; Else x++; X--; E) x++; X--;

Question 19

If you create an ArrayList without specifying the type of element, the ArrayList will store Object references which means you can put any type of object in the list.

Accepted Answer

A) True 
 B)False

Question 20

The idea that program instructions execute in order (linearly) unless otherwise specified through a conditional statement is known as

Accepted Answer

A)  boolean execution 
B)  conditional statements 
C)  try and catch 
D)  sequentiality 
E)  flow of control 
A)  boolean execution 
B)  conditional statements 
C)  try and catch 
D)  sequentiality 
E)  flow of control

Assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". Then the expression (done || s.compareTo(t) < 0) is true.

String s1 is said to overlap String s2 if all of the characters in s1 also appear in s2. Write a set of code that will set the boolean variable overlap to true if s1 overlaps s2 and false otherwise. Assume both s1 and s2 have already been input.

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().

Every iterator

The following code has a syntax error immediately before the word else. What is the error and why does it arise? Fix the code so that this statement is a legal if-else statement. if (x < 0); x++; else x--;

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;

Of the following if statements, which one correctly executes three instructions if the condition is true?

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

Code Segment Ch 05-1 if (a > 0) if (b < 0) x = x + 5; else if (a > 5) x = x + 4; else x = x + 3; else x = x + 2; -Refer to Code Segment Ch 05-1. If x is currently 0, a = 5 and b = 5, what will x become after the statement shown is executed?

Which of the following are true about check boxes?

Which type of GUI control would be best to use if you wanted the user to select one date from a list of three possible dates to take an exam?

Assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". Then the expression (s.concat(t).length() < y) is true.

What does the break statement do?

If x is an int where x = 1, what will x be after the following loop terminates? while (x < 100) X *= 2;

If a break occurs within the innermost loop of a nested loop that is three levels deep

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

Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0?

If you create an ArrayList without specifying the type of element, the ArrayList will store Object references which means you can put any type of object in the list.

The idea that program instructions execute in order (linearly) unless otherwise specified through a conditional statement is known as

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters

Exam 5: Conditionals and Loops

Assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". Then the expression (done || s.compareTo(t) < 0) is true.

String s1 is said to overlap String s2 if all of the characters in s1 also appear in s2. Write a set of code that will set the boolean variable overlap to true if s1 overlaps s2 and false otherwise. Assume both s1 and s2 have already been input.

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().

Every iterator

The following code has a syntax error immediately before the word else. What is the error and why does it arise? Fix the code so that this statement is a legal if-else statement. if (x < 0); x++; else x--;

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;

Of the following if statements, which one correctly executes three instructions if the condition is true?

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

Code Segment Ch 05-1 if (a > 0) if (b < 0) x = x + 5; else if (a > 5) x = x + 4; else x = x + 3; else x = x + 2; -Refer to Code Segment Ch 05-1. If x is currently 0, a = 5 and b = 5, what will x become after the statement shown is executed?

Which of the following are true about check boxes?

Which type of GUI control would be best to use if you wanted the user to select one date from a list of three possible dates to take an exam?

Assume that boolean done = false, int x = 10, int y = 11, String s = "Help" and String t = "Goodbye". Then the expression (s.concat(t).length() < y) is true.

What does the break statement do?

If x is an int where x = 1, what will x be after the following loop terminates? while (x < 100) X *= 2;

If a break occurs within the innermost loop of a nested loop that is three levels deep

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

Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0?

If you create an ArrayList without specifying the type of element, the ArrayList will store Object references which means you can put any type of object in the list.

The idea that program instructions execute in order (linearly) unless otherwise specified through a conditional statement is known as

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

More Conditionals and Loops

Object-Oriented Design

Arrays

Inheritance

Polymorphism

Exceptions

Recursion

Collections

Filters