Question 1

What happens if a case in a switch statement does not end with a break statement?

Accepted Answer

A)  The program will not compile. 
B)  The switch statement will never execute. 
C)  It will cause an infinite loop. 
D)  The switch statement will execute the next case statement as well. 
E)  The case will never be executed. 
A)  The program will not compile. 
B)  The switch statement will never execute. 
C)  It will cause an infinite loop. 
D)  The switch statement will execute the next case statement as well. 
E)  The case will never be executed. D

Question 2

In a nested if statement an else clause is matched to the closest unmatched if.

Accepted Answer

A) True 
 B)False  True

Question 3

The following code compiled, but while running it the program appears to hang (e.g. nothing happens). This is a clear sign of an infinite loop. What part of this code fragment caused the infinite loop?
while(i < 50); {
System.out.println(i);
i+=2;
}

Accepted Answer

There is a misplace semi-colon after the while statement. This causes the loop to have an empty body, meaning that the i variable is never updated. This leads to an infinite loop.

Question 4

Which of the following is not a valid relational operator in Java

Accepted Answer

A)   
C)  == 
D)   
E)  != 
A)   
C)  == 
D)   
E)  !=

Question 5

Every if statement requires an associated else statement, but not every else statement requires an associated if statement.

Accepted Answer

A) True 
 B)False

Question 6

Write a do loop that verifies that the user enters an odd value. You may assume that a Scanner object called input has already been created.

Accepted Answer

int value;
do {
System.out.pri

Question 7

Write a switch statement that switches on an integer variable named val. If val is 2 or 15, then output "Hello World." For all other values, output "Goodbye World."

Accepted Answer

switch(val) {
case 2:
System.o

Question 8

Write a short code fragment that uses a while loop to verify that the user enters a positive integer as input. You may assume that a Scanner object called input has already been created.

Accepted Answer

System.out.print("Please enter a positiv

Question 9

The ___________________ statement causes execution of a loop to stop, and the statement following the loop to be subsequently executed.

Accepted Answer

A)  stop 
B)  halt 
C)  continue 
D)  break 
E)  switch 
A)  stop 
B)  halt 
C)  continue 
D)  break 
E)  switch

Question 10

Which of the following statements best describes the flow of control in the main method of a Java program that has no conditionals or loops?

Accepted Answer

A)  Program statements are all executed at the same time. 
B)  Program statements are executed according to their priority, which is specified by the programmer. 
C)  Program statements are executed linearly, with earlier statements being executed first. 
D)  Program statements are executed linearly, with later statements being executed first. 
E)  Some program statements are executed at the same time, and others are executed in a linear manner. 
A)  Program statements are all executed at the same time. 
B)  Program statements are executed according to their priority, which is specified by the programmer. 
C)  Program statements are executed linearly, with earlier statements being executed first. 
D)  Program statements are executed linearly, with later statements being executed first. 
E)  Some program statements are executed at the same time, and others are executed in a linear manner.

Question 11

Write a snippet of code that determines which of two integer variables, intOne and intTwo, contains a larger number, and print out the larger one. If they are equal, the output should say that.

Accepted Answer

if(intOne > intTwo)
System.out.println(i

Question 12

An infinite loop is a compile-time error.

Accepted Answer

A) True 
 B)False

Question 13

Assume numOne and numTwo are integers. How many times might the following code print out grape? Explain your answer.
if(intOne > intTwo)
		System.out.println(intOne + “ is larger than “ + intTwo);
	else if(intOne < intTwo)
		System.out.println(intTwo + “ is larger than “ + intOne);
	else
		System.out.println(intOne + “ and “ + intTwo + “ are equal!”);

Accepted Answer

This snippet of code can only print grap

Question 14

Write a code fragment that determines how many times the character 'A' appears in a String object called name.

Accepted Answer

int countA = 0;
for(int i = 0;

Question 15

Suppose we wanted to process a text file called "input.txt" using the Scanner object. Which of the following lines of code correctly creates the necessary Scanner object?

Accepted Answer

A)  Scanner inputFile = new Scanner("input.txt"); 
B)  Scanner inputFile = new Scanner(new InputFile("input.txt"); 
C)  Scanner inputFile = new Scanner(new File(input.txt); 
D)  Scanner inputFile = new Scanner(new InputFile(input.txt); 
E)  Scanner inputFile = new Scanner(new File("input.txt"); 
A)  Scanner inputFile = new Scanner("input.txt"); 
B)  Scanner inputFile = new Scanner(new InputFile("input.txt"); 
C)  Scanner inputFile = new Scanner(new File(input.txt); 
D)  Scanner inputFile = new Scanner(new InputFile(input.txt); 
E)  Scanner inputFile = new Scanner(new File("input.txt");

Question 16

In Java, a boolean expression is limited to having exactly 2 logical operators.

Accepted Answer

A) True 
 B)False

Question 17

A _________________ is an object that has methods that allow you to process a collection of items one at a time.

Accepted Answer

A)  iterator 
B)  loop 
C)  conditional 
D)  palindrome 
E)  nested loop 
A)  iterator 
B)  loop 
C)  conditional 
D)  palindrome 
E)  nested loop

Question 18

Using a while loop, write a code fragment that computes the sum of the first n natural numbers (i.e. 1, 2, 3, 4, ... n), where n is an integer variable already defined in the program.

Accepted Answer

int i = 1;
int sum =

Question 19

Which of the following expressions best represents the condition "if the grade is between 70 and 100"?

Accepted Answer

A)  if (75  grade || grade < 100) 
E)  if (75 < grade || grade < 100) 
A)  if (75  grade || grade < 100) 
E)  if (75 < grade || grade < 100)

Question 20

What is output by the following code fragment?
int num = 0;
int max = 10;
while(num < max) {
System.out.println(num);
num += 2;
}

Accepted Answer

This code

What happens if a case in a switch statement does not end with a break statement?

In a nested if statement an else clause is matched to the closest unmatched if.

The following code compiled, but while running it the program appears to hang (e.g. nothing happens). This is a clear sign of an infinite loop. What part of this code fragment caused the infinite loop? while(i < 50); { System.out.println(i); i+=2; }

Which of the following is not a valid relational operator in Java

Every if statement requires an associated else statement, but not every else statement requires an associated if statement.

Write a do loop that verifies that the user enters an odd value. You may assume that a Scanner object called input has already been created.

Write a switch statement that switches on an integer variable named val. If val is 2 or 15, then output "Hello World." For all other values, output "Goodbye World."

Write a short code fragment that uses a while loop to verify that the user enters a positive integer as input. You may assume that a Scanner object called input has already been created.

The ___________________ statement causes execution of a loop to stop, and the statement following the loop to be subsequently executed.

Which of the following statements best describes the flow of control in the main method of a Java program that has no conditionals or loops?

Write a snippet of code that determines which of two integer variables, intOne and intTwo, contains a larger number, and print out the larger one. If they are equal, the output should say that.

An infinite loop is a compile-time error.

Write a code fragment that determines how many times the character 'A' appears in a String object called name.

Suppose we wanted to process a text file called "input.txt" using the Scanner object. Which of the following lines of code correctly creates the necessary Scanner object?

In Java, a boolean expression is limited to having exactly 2 logical operators.

A _________________ is an object that has methods that allow you to process a collection of items one at a time.

Using a while loop, write a code fragment that computes the sum of the first n natural numbers (i.e. 1, 2, 3, 4, ... n), where n is an integer variable already defined in the program.

Which of the following expressions best represents the condition "if the grade is between 70 and 100"?

What is output by the following code fragment? int num = 0; int max = 10; while(num < max) { System.out.println(num); num += 2; }

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Graphical User Interfaces

Arrays

Inheritance

Polymorphism

Recursion

Exceptions

Searching and Sorting

Trees

Introduction to Collections and Stacks

Heaps and Priority Queues

Graphs

Filters

Exam 4: Conditionals and Loops

What happens if a case in a switch statement does not end with a break statement?

In a nested if statement an else clause is matched to the closest unmatched if.

The following code compiled, but while running it the program appears to hang (e.g. nothing happens). This is a clear sign of an infinite loop. What part of this code fragment caused the infinite loop? while(i < 50); { System.out.println(i); i+=2; }

Which of the following is not a valid relational operator in Java

Every if statement requires an associated else statement, but not every else statement requires an associated if statement.

Write a do loop that verifies that the user enters an odd value. You may assume that a Scanner object called input has already been created.

Write a switch statement that switches on an integer variable named val. If val is 2 or 15, then output "Hello World." For all other values, output "Goodbye World."

Write a short code fragment that uses a while loop to verify that the user enters a positive integer as input. You may assume that a Scanner object called input has already been created.

The ___________________ statement causes execution of a loop to stop, and the statement following the loop to be subsequently executed.

Which of the following statements best describes the flow of control in the main method of a Java program that has no conditionals or loops?

Write a snippet of code that determines which of two integer variables, intOne and intTwo, contains a larger number, and print out the larger one. If they are equal, the output should say that.

An infinite loop is a compile-time error.

Write a code fragment that determines how many times the character 'A' appears in a String object called name.

Suppose we wanted to process a text file called "input.txt" using the Scanner object. Which of the following lines of code correctly creates the necessary Scanner object?

In Java, a boolean expression is limited to having exactly 2 logical operators.

A _________________ is an object that has methods that allow you to process a collection of items one at a time.

Using a while loop, write a code fragment that computes the sum of the first n natural numbers (i.e. 1, 2, 3, 4, ... n), where n is an integer variable already defined in the program.

Which of the following expressions best represents the condition "if the grade is between 70 and 100"?

What is output by the following code fragment? int num = 0; int max = 10; while(num < max) { System.out.println(num); num += 2; }

Introduction

Data and Expressions

Using Classes and Objects

Writing Classes

Graphical User Interfaces

Arrays

Inheritance

Polymorphism

Recursion

Exceptions

Searching and Sorting

Trees

Introduction to Collections and Stacks

Heaps and Priority Queues

Graphs

Filters