Question 1

What is the meaning of x = 0; in Java?

Accepted Answer

A) It checks whether x equals 0. 
B) It sets the variable x to zero. 
C) It defines a variable named x and initializes it with 0. 
D) It is a syntax error because x is not always 0. 
A) It checks whether x equals 0. 
B) It sets the variable x to zero. 
C) It defines a variable named x and initializes it with 0. 
D) It is a syntax error because x is not always 0.

Question 2

Assuming that the user enters 45 and 62 as inputs for n1 and n2, respectively, what is the output of the following code snippet?

Accepted Answer

A) 46 
B) 4662 
C) 107 
D) 4562 
A) 46 
B) 4662 
C) 107 
D) 4562

Question 3

Assume the following variables have been declared and given values as shown:
String str = "0123456789";
String sub = str.substring(3, 4);
Which is the value of sub?

Accepted Answer

A) 3 
B) 34 
C) 345 
D) 3456 
A) 3 
B) 34 
C) 345 
D) 3456

Question 4

The problem solving process emphasizes a "first, do-it-by-hand" approach because

Accepted Answer

A) pseudocode is not able to capture the subtleties of complex problems. 
B) it is faster to do computations by hand than to do them by computer. 
C) this guarantees that programs will be correct. 
D) if programmers cannot compute a solution by hand, it is unlikely they will be able to write a program that can do it. 
A) pseudocode is not able to capture the subtleties of complex problems. 
B) it is faster to do computations by hand than to do them by computer. 
C) this guarantees that programs will be correct. 
D) if programmers cannot compute a solution by hand, it is unlikely they will be able to write a program that can do it.

Question 5

What is the difference between the result of the following two Java statements?
I.int cents = (int)(100 * price + 0.5);
II.int cents = (100 * price + 0.5);

Accepted Answer

A) Statement I causes truncation, but II does not 
B) Statement II causes truncation, but I does not 
C) Statement I compiles, but II does not 
D) Statement II compiles, but I does not 
A) Statement I causes truncation, but II does not 
B) Statement II causes truncation, but I does not 
C) Statement I compiles, but II does not 
D) Statement II compiles, but I does not

Question 6

What happens to the fractional part when a division is performed on two integer variables?

Accepted Answer

A) The fractional part is rounded off to the nearest integer value. 
B) The fractional part is discarded. 
C) Two integers cannot be used in division; at least one of the operands should be a floating-point number. 
D) Instead of using an integer division, you should use the modulus operator to perform floating-point division. 
A) The fractional part is rounded off to the nearest integer value. 
B) The fractional part is discarded. 
C) Two integers cannot be used in division; at least one of the operands should be a floating-point number. 
D) Instead of using an integer division, you should use the modulus operator to perform floating-point division.

Question 7

What is the result of the following code snippet?

Accepted Answer

A) 0 
B) 3.14 
C) 6.28 
D) compile-time error 
A) 0 
B) 3.14 
C) 6.28 
D) compile-time error

Question 8

Assuming that the user enters 23 and 45 as inputs for num1 and num2, respectively, what is the output of the following code snippet?

Accepted Answer

A) 23 
B) 4523 
C) 68 
D) 2345 
A) 23 
B) 4523 
C) 68 
D) 2345

Question 9

What will be printed by the statements below?

Accepted Answer

A) salaryBONUS 
B) 120 
C) 100BONUS 
D) Nothing will be printed because constants cannot be used in expressions. 
A) salaryBONUS 
B) 120 
C) 100BONUS 
D) Nothing will be printed because constants cannot be used in expressions.

Question 10

Which of the following statements is correct about constants?

Accepted Answer

A) Constants are written using uppercase letters because the compiler ignores constants declared in lowercase letters. 
B) The data stored inside a final variable can be changed using an assignment statement. 
C) You can make a variable constant by using the constant reserved word while declaring the variable. 
D) Variables defined using final make a code snippet more readable and easier to maintain. 
A) Constants are written using uppercase letters because the compiler ignores constants declared in lowercase letters. 
B) The data stored inside a final variable can be changed using an assignment statement. 
C) You can make a variable constant by using the constant reserved word while declaring the variable. 
D) Variables defined using final make a code snippet more readable and easier to maintain.

Question 11

Which one of the following is a correct method for defining and initializing an integer variable with name value?

Accepted Answer

A) int value = 30; 
B) Int value = 30; 
C) int value = .30; 
D) Int value = .30; 
A) int value = 30; 
B) Int value = 30; 
C) int value = .30; 
D) Int value = .30;

Question 12

What is wrong with the following code snippet?

Accepted Answer

A) The average variable is never initialized. 
B) The data type for the average variable is not specified. 
C) The average variable is never assigned a value. 
D) The average variable is assigned a non-numeric value. 
A) The average variable is never initialized. 
B) The data type for the average variable is not specified. 
C) The average variable is never assigned a value. 
D) The average variable is assigned a non-numeric value.

Question 13

How do you extract the first 5 characters from the string str?

Accepted Answer

A) substring(str, 5) 
B) substring.str(0,5) 
C) str.substring(5) 
D) str.substring(0,5) 
A) substring(str, 5) 
B) substring.str(0,5) 
C) str.substring(5) 
D) str.substring(0,5)

Question 14

Assuming that the user inputs a value of 25 for the price and 10 for the discount rate in the following code snippet, what is the output?

Accepted Answer

A) The new price is 25.0 
B) The new price is 15.0 
C) The new price is 22.5 
D) The new price is 20.0 
A) The new price is 25.0 
B) The new price is 15.0 
C) The new price is 22.5 
D) The new price is 20.0

Question 15

Suppose a phone number, stored as a ten-character string (of digits only) called phoneNumber must be converted into a string that has parentheses around the area code.Which statement below will do that?

Accepted Answer

A)  String newNumber ="("+
phoneNumber. substring (3,0)+") "; 
B)  String newNumber ="("+")"+ phoneNumber; 
C)  String newNumber ="("+
phoneNumber. substring (1,3)+")"+ phoneNumber. substring (3,7); 
D)  String newNumber ="("+phoneNumber.substring (0,3)+")"+ phoneNumber. substring(3, 10); 
A)  String newNumber ="("+
phoneNumber. substring (3,0)+") "; 
B)  String newNumber ="("+")"+ phoneNumber; 
C)  String newNumber ="("+
phoneNumber. substring (1,3)+")"+ phoneNumber. substring (3,7); 
D)  String newNumber ="("+phoneNumber.substring (0,3)+")"+ phoneNumber. substring(3, 10);

Question 16

Which one of the following operators computes the remainder of an integer division?

Accepted Answer

A) / 
B) % 
C) \ 
D) ! 
A) / 
B) % 
C) \ 
D) !

Question 17

What will be the value stored in the variable x after the execution of the following code snippet?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) The code has a syntax error 
A) 1 
B) 2 
C) 4 
D) The code has a syntax error

Question 18

What is the output of the following code snippet?

Accepted Answer

A) 0 
B) 4 
C) 10 
D) 250 
A) 0 
B) 4 
C) 10 
D) 250

Question 19

What will be the value of the variables x and y after the given set of assignments?

Accepted Answer

A) x = 40, y = 20 
B) x = 20, y = 10 
C) x = 10, y = 20 
D) x = 20, y = 20 
A) x = 40, y = 20 
B) x = 20, y = 10 
C) x = 10, y = 20 
D) x = 20, y = 20

Question 20

Which is the mathematical equivalent of the following Java expression?

Accepted Answer

A)  h=4ab-2b/ c 
B)  h=(4ab-2b) / c 
C)  h=4 ab-b2 / c 
D)  h=4ab-b2 / c 
A)  h=4ab-2b/ c 
B)  h=(4ab-2b) / c 
C)  h=4 ab-b2 / c 
D)  h=4ab-b2 / c

Exam 4: Fundamental Data Types

What is the meaning of x = 0; in Java?

Assuming that the user enters 45 and 62 as inputs for n1 and n2, respectively, what is the output of the following code snippet?

Assume the following variables have been declared and given values as shown: String str = "0123456789"; String sub = str.substring(3, 4); Which is the value of sub?

The problem solving process emphasizes a "first, do-it-by-hand" approach because

What is the difference between the result of the following two Java statements? I.int cents = (int)(100 * price + 0.5); II.int cents = (100 * price + 0.5);

What happens to the fractional part when a division is performed on two integer variables?

What is the result of the following code snippet?

Assuming that the user enters 23 and 45 as inputs for num1 and num2, respectively, what is the output of the following code snippet?

What will be printed by the statements below?

Which of the following statements is correct about constants?

Which one of the following is a correct method for defining and initializing an integer variable with name value?

What is wrong with the following code snippet?

How do you extract the first 5 characters from the string str?

Assuming that the user inputs a value of 25 for the price and 10 for the discount rate in the following code snippet, what is the output?

Suppose a phone number, stored as a ten-character string (of digits only) called phoneNumber must be converted into a string that has parentheses around the area code.Which statement below will do that?

Which one of the following operators computes the remainder of an integer division?

What will be the value stored in the variable x after the execution of the following code snippet?

What is the output of the following code snippet?

What will be the value of the variables x and y after the given set of assignments?

Which is the mathematical equivalent of the following Java expression?

Introduction

Using Objects

Implementing Classes

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Input/Output and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Stream Processing

Graphical User Interfaces

Advanced Input/Output

Multithreading

Internet Networking

Relational Databases

XML

Filters