Question 1

Which statement about number literals in Java is false?

Accepted Answer

A) Numbers in exponential notation always have type double 
B) Zero is an integer 
C) Integers must be positive 
D) An integer with fractional part of .0 has type double. 
A) Numbers in exponential notation always have type double 
B) Zero is an integer 
C) Integers must be positive 
D) An integer with fractional part of .0 has type double.

Question 2

What is the value of the following expression?
-18 % 5

Accepted Answer

A) -2 
B) -3 
C) 2 
D) 3 
A) -2 
B) -3 
C) 2 
D) 3

Question 3

What is the upper limit on the size of an integer represented by the BigInteger object in Java?

Accepted Answer

A) 32,767 
B) 2,147,483,647 
C) 9,223,372,036,854,775,807 
D) Essentially no limit 
A) 32,767 
B) 2,147,483,647 
C) 9,223,372,036,854,775,807 
D) Essentially no limit

Question 4

Which of the following statements with comments is(are) valid?

Accepted Answer

A) Only I 
B) I and II 
C) II and III 
D) Only III 
A) Only I 
B) I and II 
C) II and III 
D) Only III

Question 5

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression

A)c = PI * (radius * 2);
B)c = PI * Math.pow(2, radius);
C)c = PI * Math.pow(radius, 2);
D)c = Math.pow(PI * radius, 2);

Accepted Answer

The answer of Given the definition final double PI =...

Question 6

Assuming that the user inputs a value of 25000 for the pay and 10 for the bonus rate in the following code snippet, what is the output?

Accepted Answer

A) The new pay is 25000.0 
B) The new pay is 25100.0 
C) The new pay is 27500.0 
D) The new pay is 30000.0 
A) The new pay is 25000.0 
B) The new pay is 25100.0 
C) The new pay is 27500.0 
D) The new pay is 30000.0

Question 7

The typical ranges for integers may seem strange but are derived from

Accepted Answer

A) Base 10 floating-point precision 
B) Field requirements for typical usage and limits 
C) Overflows 
D) Powers of two because of base 2 representation within the computer 
A) Base 10 floating-point precision 
B) Field requirements for typical usage and limits 
C) Overflows 
D) Powers of two because of base 2 representation within the computer

Question 8

Assuming price contains the value 20.0, which of the following statements displays price =20.00

Accepted Answer

A)  System.out.print("price =" "); 
System. out.printf (price); 
B)  System.out.print("price ="); 
System.out.printf("\%f", price); 
C)  System. out.print("price ="); 
System. out. printf ("\%10.2f", price); 
D)  System.out.print("price = "); 
System. out.printf("\%2.10f", price); 
A)  System.out.print("price =" "); 
System. out.printf (price); 
B)  System.out.print("price ="); 
System.out.printf("\%f", price); 
C)  System. out.print("price ="); 
System. out. printf ("\%10.2f", price); 
D)  System.out.print("price = "); 
System. out.printf("\%2.10f", price);

Question 9

Which one of the following statements displays the output as 54321.00?

Accepted Answer

A) System.out.printf("%8.2f", 54321.0); 
B) System.out.printf("%8,2f", 54321.0); 
C) System.out.printf(",8.2f", 54321.0); 
D) System.out.printf("%8.00f", 54321.0); 
A) System.out.printf("%8.2f", 54321.0); 
B) System.out.printf("%8,2f", 54321.0); 
C) System.out.printf(",8.2f", 54321.0); 
D) System.out.printf("%8.00f", 54321.0);

Question 10

Which one of the following statements gives the absolute value of the floating-point number x = -25.50?

Accepted Answer

A) abs(x); 
B) Math.abs(x); 
C) x.abs(); 
D) x.absolute(); 
A) abs(x); 
B) Math.abs(x); 
C) x.abs(); 
D) x.absolute();

Question 11

Which one of the following variables is assigned with valid literals?

Accepted Answer

A)  int salary =0; 
salary = 5000.50; 
B)  int salary 1=0; 
salary 1=1.2E6; 
C)  double salary 2=0; 
salary 2=2.96E-2; 
D)  long salary 3=0; 
salary 3=1E-6; 
A)  int salary =0; 
salary = 5000.50; 
B)  int salary 1=0; 
salary 1=1.2E6; 
C)  double salary 2=0; 
salary 2=2.96E-2; 
D)  long salary 3=0; 
salary 3=1E-6;

Question 12

Which one of the following statements displays the output as -1.23e+02?

Accepted Answer

A) System.out.printf("%5.2e", -123.0); 
B) System.out.printf("%5.1e", -123.0); 
C) System.out.printf("^5.2e", -123.0); 
D) System.out.printf("%5.2E", -123.0); 
A) System.out.printf("%5.2e", -123.0); 
B) System.out.printf("%5.1e", -123.0); 
C) System.out.printf("^5.2e", -123.0); 
D) System.out.printf("%5.2E", -123.0);

Question 13

Which one of the following statements displays the output as +000321.00?

Accepted Answer

A) System.out.printf("+%09.2f", 321.0); 
B) System.out.printf("%009,2f", 321.0); 
C) System.out.printf("+9.2f", 321.0); 
D) System.out.printf("%09.00f", 321.0); 
A) System.out.printf("+%09.2f", 321.0); 
B) System.out.printf("%009,2f", 321.0); 
C) System.out.printf("+9.2f", 321.0); 
D) System.out.printf("%09.00f", 321.0);

Question 14

The assignment operator

Accepted Answer

A) denotes mathematical equality 
B) places a new value into a variable 
C) means the same as the equals sign used in algebra 
D) makes it illegal to write a statement like sum = sum + 4; 
A) denotes mathematical equality 
B) places a new value into a variable 
C) means the same as the equals sign used in algebra 
D) makes it illegal to write a statement like sum = sum + 4;

Question 15

Which statement is true?

Accepted Answer

A) Variables cannot be assigned and declared in the same statement 
B) Variable names must contain at least one dollar sign 
C) Variable names can be no more than 8 characters long 
D) It is incorrect to initialize a string variable with a number 
A) Variables cannot be assigned and declared in the same statement 
B) Variable names must contain at least one dollar sign 
C) Variable names can be no more than 8 characters long 
D) It is incorrect to initialize a string variable with a number

Question 16

Which one of the following statements defines a constant with the value 123?

Accepted Answer

A)  final int MY_CONST  = 1 2 3 ; 
B)  const int MY_CONST =123; 
C)  final int
MY_CONST =0 ;
MY CONST =123 ; 
D)  static int MY_CONST =123; 
A)  final int MY_CONST  = 1 2 3 ; 
B)  const int MY_CONST =123; 
C)  final int
MY_CONST =0 ;
MY CONST =123 ; 
D)  static int MY_CONST =123;

Question 17

What is the output of this code snippet?

Accepted Answer

A) 2424 
B) 2425 
C) 2428 
D) 2528 
A) 2424 
B) 2425 
C) 2428 
D) 2528

Question 18

Which one of the following expressions can be used to extract the last five characters from any string variable str?

Accepted Answer

A) str.substring(str.length() - 5, str.length()) 
B) str.substring(5, 5) 
C) str.substring(str.length() - 4, 5) 
D) str.substring(str.length() - 5, 5) 
A) str.substring(str.length() - 5, str.length()) 
B) str.substring(5, 5) 
C) str.substring(str.length() - 4, 5) 
D) str.substring(str.length() - 5, 5)

Question 19

What are the values of num1 and num2 after this snippet executes?

Accepted Answer

A) num1 = 4.20 and num2 = 42.0 
B) num1 = 4.20 and num2 = 47.0 
C) num1 = 42.0 and num2 = 42.0 
D) num1 = 42.0 and num2 = 47.0 
A) num1 = 4.20 and num2 = 42.0 
B) num1 = 4.20 and num2 = 47.0 
C) num1 = 42.0 and num2 = 42.0 
D) num1 = 42.0 and num2 = 47.0

Question 20

Which of the given System.out.print statements generates the following output?
ABCDE"\

Accepted Answer

A) System.out.println("ABCDE"\"); 
B) System.out.println("ABCDE""); 
C) System.out.println("ABCDE"\); 
D) System.out.println("ABCDE""); 
A) System.out.println("ABCDE"\"); 
B) System.out.println("ABCDE""); 
C) System.out.println("ABCDE"\); 
D) System.out.println("ABCDE"");

Exam 4: Fundamental Data Types

Which statement about number literals in Java is false?

What is the value of the following expression? -18 % 5

What is the upper limit on the size of an integer represented by the BigInteger object in Java?

Which of the following statements with comments is(are) valid?

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression A)c = PI * (radius * 2); B)c = PI * Math.pow(2, radius); C)c = PI * Math.pow(radius, 2); D)c = Math.pow(PI * radius, 2);

Assuming that the user inputs a value of 25000 for the pay and 10 for the bonus rate in the following code snippet, what is the output?

The typical ranges for integers may seem strange but are derived from

Assuming price contains the value 20.0, which of the following statements displays price =20.00

Which one of the following statements displays the output as 54321.00?

Which one of the following statements gives the absolute value of the floating-point number x = -25.50?

Which one of the following variables is assigned with valid literals?

Which one of the following statements displays the output as -1.23e+02?

Which one of the following statements displays the output as +000321.00?

The assignment operator

Which statement is true?

Which one of the following statements defines a constant with the value 123?

What is the output of this code snippet?

Which one of the following expressions can be used to extract the last five characters from any string variable str?

What are the values of num1 and num2 after this snippet executes?

Which of the given System.out.print statements generates the following output? ABCDE"\

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