Question 1

What is the value of Math.pow(3, 2)?

Accepted Answer

A) 6.0 
B) 9.0 
C) 8.0 
D) 5.0 
A) 6.0 
B) 9.0 
C) 8.0 
D) 5.0

Question 2

What is the value of the following expression?
3 * 5 / 2 * 5

Accepted Answer

A) 1.5 
B) 30 
C) 35 
D) 37.5 
A) 1.5 
B) 30 
C) 35 
D) 37.5

Question 3

Which one of the following refers to a number constant that appears in code without explanation?

Accepted Answer

A) Constant 
B) Variable 
C) Magic number 
D) String literal 
A) Constant 
B) Variable 
C) Magic number 
D) String literal

Question 4

Which is the Java equivalent of the following mathematical expression?

Accepted Answer

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

Question 5

What is wrong with the following code snippet?

Accepted Answer

A) The price variable is never initialized. 
B) The data type for the price variable is not specified. 
C) The price variable is never assigned a value. 
D) The price variable is assigned a decimal value. 
A) The price variable is never initialized. 
B) The data type for the price variable is not specified. 
C) The price variable is never assigned a value. 
D) The price variable is assigned a decimal value.

Question 6

Which of the following options defines an integer variable?

Accepted Answer

A) char age; 
B) integer age; 
C) int age; 
D) age: int; 
A) char age; 
B) integer age; 
C) int age; 
D) age: int;

Question 7

What is the result of the following code snippet?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) Does not compile 
A) 0 
B) 1 
C) 2 
D) Does not compile

Question 8

What is the value of the value variable at the end of the given code snippet?

Accepted Answer

A) -2 
B) 0 
C) 2 
D) 4 
A) -2 
B) 0 
C) 2 
D) 4

Question 9

In an airline reservation system, the number of available seats in an airplane is required.Which data type should be used to store this value?

Accepted Answer

A) double 
B) float 
C) int 
D) long 
A) double 
B) float 
C) int 
D) long

Question 10

What is the output of the following code snippet?

Accepted Answer

A) The initial value of the counter is 0 
B) The initial value of the counter is 1 
C) The code will not compile 
D) The initial value of the counter is 
A) The initial value of the counter is 0 
B) The initial value of the counter is 1 
C) The code will not compile 
D) The initial value of the counter is

Question 11

What is the output of the following code snippet?

Accepted Answer

A) Java 
B) Good Java 
C) Good 
D) Is Good 
A) Java 
B) Good Java 
C) Good 
D) Is Good

Question 12

Why is the double type not appropriate for financial calculations?

Accepted Answer

A) Roundoff errors occur when an exact representation of a floating point number is not possible. 
B) The range is too small. 
C) The calculations are too slow. 
D) There are too few significant digits. 
A) Roundoff errors occur when an exact representation of a floating point number is not possible. 
B) The range is too small. 
C) The calculations are too slow. 
D) There are too few significant digits.

Question 13

What is the value of the var variable at the end of the given code snippet?

Accepted Answer

A) 0 
B) 1 
C) 30 
D) 31 
A) 0 
B) 1 
C) 30 
D) 31

Question 14

Consider the following division statements:
I.22 / 7
II.22.0 / 7
III.22 / 7.0
Which of the following is correct?

Accepted Answer

A) All three statements will return an integer value. 
B) Only I will return an integer value. 
C) Only I, II will return an integer value. 
D) Only I and III will return an integer value. 
A) All three statements will return an integer value. 
B) Only I will return an integer value. 
C) Only I, II will return an integer value. 
D) Only I and III will return an integer value.

Question 15

The first step in problem solving is

Accepted Answer

A) To write the expression that calculates the answer 
B) To understand the problem and its inputs and outputs 
C) To do examples by hand that confirm the solution will work 
D) To write Java code that can be executed and tested 
A) To write the expression that calculates the answer 
B) To understand the problem and its inputs and outputs 
C) To do examples by hand that confirm the solution will work 
D) To write Java code that can be executed and tested

Question 16

Assume the following variables have been declared and given values as shown:
int i = 2345;
double m = 67.8;
Which statement will give the output below?
Values are 2345 and 67.80

Accepted Answer

A) System.out.printf("Values are %10d and %7.2f", i, m); 
B) System.out.printf("Values are %6d and %2.2f", i, m); 
C) System.out.printf("Values are %i and %m"); 
D) System.out.println("Values are " + i + " and " + m); 
A) System.out.printf("Values are %10d and %7.2f", i, m); 
B) System.out.printf("Values are %6d and %2.2f", i, m); 
C) System.out.printf("Values are %i and %m"); 
D) System.out.println("Values are " + i + " and " + m);

Question 17

Which of the given statements generates the following output?
\"///

Accepted Answer

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

Question 18

Which of the following statements about constants in Java are true?
I.Although not required, constants are commonly named using uppercase letters
II.Only integer values can appear as constants
III.A variable can be defined with an initial value, but the reserved word final prevents it from being changed
IV.A named constant makes computations that use it clearer

Accepted Answer

A) I, II, III 
B) II, III, IV 
C) I, III, IV 
D) I, II, IV 
A) I, II, III 
B) II, III, IV 
C) I, III, IV 
D) I, II, IV

Question 19

What is the output of the following code snippet?

Accepted Answer

A) 25 
B) 50 
C) 49 
D) 26 
A) 25 
B) 50 
C) 49 
D) 26

Question 20

What is the output of the following code snippet?

Accepted Answer

A)  First: William
Last: 
B)  First: William
Last: lastname 
C)  Code will not compile 
D)  Unpredictable output 
A)  First: William
Last: 
B)  First: William
Last: lastname 
C)  Code will not compile 
D)  Unpredictable output

Exam 4: Fundamental Data Types

What is the value of Math.pow(3, 2)?

What is the value of the following expression? 3 * 5 / 2 * 5

Which one of the following refers to a number constant that appears in code without explanation?

Which is the Java equivalent of the following mathematical expression?

What is wrong with the following code snippet?

Which of the following options defines an integer variable?

What is the result of the following code snippet?

What is the value of the value variable at the end of the given code snippet?

In an airline reservation system, the number of available seats in an airplane is required.Which data type should be used to store this value?

What is the output of the following code snippet?

What is the output of the following code snippet?

Why is the double type not appropriate for financial calculations?

What is the value of the var variable at the end of the given code snippet?

Consider the following division statements: I.22 / 7 II.22.0 / 7 III.22 / 7.0 Which of the following is correct?

The first step in problem solving is

Assume the following variables have been declared and given values as shown: int i = 2345; double m = 67.8; Which statement will give the output below? Values are 2345 and 67.80

Which of the given statements generates the following output? \\\"///

What is the output of the following code snippet?

What is the output of the following code snippet?

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

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