Question 1

Which one of the following statements can be used to extract the last 10 characters from the string variable str?

Accepted Answer

A)  str.substring(str.length() - 10, str.length()) 
B)  str.substring(10, str.length()) 
C)  str.substring(str.length() - 9, 10) 
D)  str.substring(0, 10) 
A)  str.substring(str.length() - 10, str.length()) 
B)  str.substring(10, str.length()) 
C)  str.substring(str.length() - 9, 10) 
D)  str.substring(0, 10)

Question 2

What is the output of the following code snippet? public static void main(String[] args)
{
Int value = 25;
Value = value * 2;
Value--;
System.out.println(value);
}

Accepted Answer

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

Question 3

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 4

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

Accepted Answer

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

Question 5

Assuming that the user inputs "Joe" at the prompt, what is the output of the following code snippet? public static void main(String[] args)
{
System.out.print("Enter your name ");
String name;
Scanner in = new Scanner(System.in);
Name = in.next();
Name += ", Good morning";
System.out.print(name);
}

Accepted Answer

A)  The code snippet does not compile because the += operator cannot be used in this context. 
B)  Joe, Good morning 
C)  , Good morning 
D)  Joe 
A)  The code snippet does not compile because the += operator cannot be used in this context. 
B)  Joe, Good morning 
C)  , Good morning 
D)  Joe

Question 6

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

Question 7

What is the output of the following code snippet? System.out.printf("%5.3f", 20.0);

Accepted Answer

A)  20 
B)  20.0 
C)  20.00 
D)  20.000 
A)  20 
B)  20.0 
C)  20.00 
D)  20.000

Question 8

What is the value inside the var variable at the end of the given code snippet? public static void main(String[] args)
{
Int var = 30;
Var = var + 2 / var;
Var++;
}

Accepted Answer

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

Question 9

Assuming that the user enters 23 and 45 as inputs for num1 and num2, respectively, what is the output of the following code snippet? public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
String num1 = in.next();
System.out.print("Enter another number: ");
String num2 = in.next();
System.out.println(num1 + num2);
}

Accepted Answer

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

Question 10

What is the result of the following expression? double d = 2.5 + 4 * -1.5 - (2.5 + 4) * -1.5;

Accepted Answer

A)  24.375 
B)  6.25 
C)  12.375 
D)  6 
A)  24.375 
B)  6.25 
C)  12.375 
D)  6

Question 11

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 12

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 13

What are the values of num1 and num2 after this snippet executes? double num1 = 4.20;
Double num2 = num1 * 10 + 5.0;

Accepted Answer

A)  num1 = 4.20 and num2 = 63.0 
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 = 63.0 
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 14

How do you compute the length of the string str?

Accepted Answer

A)  length(str) 
B)  length.str 
C)  str.length 
D)  str.length() 
A)  length(str) 
B)  length.str 
C)  str.length 
D)  str.length()

Question 15

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c =  $\pi$ radius2

Accepted Answer

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); 
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);

Question 16

What is the output of this code snippet? double average;
Int grade1 = 87;
Int grade2 = 94;
// System.out.print("The average is " + (grade1 + grade2) / 2.0);
System.out.print("The average is " + average);

Accepted Answer

A)  Compile-time error 
B)  The average is 91.5 
C)  The average is 91.5 The average is 91.5 
D)  The average is 91.5 The average is 0.0 
A)  Compile-time error 
B)  The average is 91.5 
C)  The average is 91.5 The average is 91.5 
D)  The average is 91.5 The average is 0.0

Question 17

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 18

Which of the following statements places input into the variable value given this line of code? Scanner in = new Scanner(System.in);

Accepted Answer

A)  int value = in(); 
B)  int value = in.nextInt(); 
C)  int value = in.next(); 
D)  int value = in.nextFloat(); 
A)  int value = in(); 
B)  int value = in.nextInt(); 
C)  int value = in.next(); 
D)  int value = in.nextFloat();

Question 19

What is the output of the following code snippet? public static void main(String[] args)
{
Double x;
X = Math.pow(3.0, 2.0) + Math.pow(4.0, 2.0);
System.out.println(x);
}

Accepted Answer

A)  25.0 
B)  34 
C)  7.0 
D)  14 
A)  25.0 
B)  34 
C)  7.0 
D)  14

Question 20

Which of the following is the mathematical equivalent of the following Java expression? h = (4.0 * a * b - Math.pow(b, 2)) / c;

Accepted Answer

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

Exam 4: Fundamental Data Types

Which one of the following statements can be used to extract the last 10 characters from the string variable str?

What is the output of the following code snippet? public static void main(String[] args) { Int value = 25; Value = value * 2; Value--; System.out.println(value); }

Which of the following options defines an integer variable?

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

Assuming that the user inputs "Joe" at the prompt, what is the output of the following code snippet? public static void main(String[] args) { System.out.print("Enter your name "); String name; Scanner in = new Scanner(System.in); Name = in.next(); Name += ", Good morning"; System.out.print(name); }

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

What is the output of the following code snippet? System.out.printf("%5.3f", 20.0);

What is the value inside the var variable at the end of the given code snippet? public static void main(String[] args) { Int var = 30; Var = var + 2 / var; Var++; }

What is the result of the following expression? double d = 2.5 + 4 * -1.5 - (2.5 + 4) * -1.5;

The first step in problem solving is

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 are the values of num1 and num2 after this snippet executes? double num1 = 4.20; Double num2 = num1 * 10 + 5.0;

How do you compute the length of the string str?

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = π\piπ radius2

What is the output of this code snippet? double average; Int grade1 = 87; Int grade2 = 94; // System.out.print("The average is " + (grade1 + grade2) / 2.0); System.out.print("The average is " + average);

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

Which of the following statements places input into the variable value given this line of code? Scanner in = new Scanner(System.in);

What is the output of the following code snippet? public static void main(String[] args) { Double x; X = Math.pow(3.0, 2.0) + Math.pow(4.0, 2.0); System.out.println(x); }

Which of the following is the mathematical equivalent of the following Java expression? h = (4.0 * a * b - Math.pow(b, 2)) / c;

Introduction

Using Objects

Implementing Classes

Decisions

Loops

Arrays and Array Lists

Designing Classes

Inheritance

Interfaces

Inputoutput and Exception Handling

Object-Oriented Design

Recursion

Sorting and Searching

The Java Collections Framework

Basic Data Structures

Tree Structures

Generic Classes

Graphical User Interfaces

Streams and Binary Inputoutput

Multithreading

Internet Networking

Relational Databases

XML

Web Applications

Filters

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = $\pi$ radius²