Question 1

What is the result of the following code snippet?
Double bottles;
Double bottleVolume = bottles * 2;
System.out.println(bottleVolume);

Accepted Answer

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

Question 2

Which is the Java equivalent of the following mathematical expression?
C = √(a2 + b2)

Accepted Answer

A)  c = Math.sqrt(a * 2 + b * 2); 
B)  c = Math.sqrt(a * 2) + Math.sqrt(b * 2); 
C)  c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2)); 
D)  c = Math.sqrt(Math.pow(a, 2)) + Math.sqrt(Math.pow(b, 2)); 
A)  c = Math.sqrt(a * 2 + b * 2); 
B)  c = Math.sqrt(a * 2) + Math.sqrt(b * 2); 
C)  c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2)); 
D)  c = Math.sqrt(Math.pow(a, 2)) + Math.sqrt(Math.pow(b, 2));

Question 3

Which one of the following statements can be used to convert a string str to a double?

Accepted Answer

A)  double n = str.parseDouble(); 
B)  double n = Integer.parseDouble(str); 
C)  double n = Double.parseDouble(str); 
D)  double n = double.parseDouble(str); 
A)  double n = str.parseDouble(); 
B)  double n = Integer.parseDouble(str); 
C)  double n = Double.parseDouble(str); 
D)  double n = double.parseDouble(str);

Question 4

Which of the methods below are static methods?
I. length
II. substring
III. pow
IV. sqrt

Accepted Answer

A)  All the methods are static 
B)  Only I, II and III 
C)  Only II and IV 
D)  Only III and IV 
A)  All the methods are static 
B)  Only I, II and III 
C)  Only II and IV 
D)  Only III and IV

Question 5

What will be the value inside the variables x and y after the given set of assignments?
Int x = 20;
Int y = 10;
X = (x - y) * 2;
Y = x / 2;

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 6

What is the output of the following code snippet?
Public static void main(String[] args)
{
Int var1 = 10;
Int var2 = 2;
Int var3 = 20;
Var3 = var3 / (var1 % var2);
System.out.println(var3);
}

Accepted Answer

A)  0 
B)  4 
C)  20 
D)  There will be no output due to a run-time error. 
A)  0 
B)  4 
C)  20 
D)  There will be no output due to a run-time error.

Question 7

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 8

What will be the value stored in the variable x after the execution of the following code snippet?
Int a = 10;
Int b = 20;
Int c = 2;
Int x = b / a /*c*/;

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 9

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 10

Which statement is true about variable names in Java?

Accepted Answer

A)  They can contain the percent sign (%) 
B)  They can contain an underscore symbol ("_") 
C)  They can contain spaces 
D)  They must make sense as a word 
A)  They can contain the percent sign (%) 
B)  They can contain an underscore symbol ("_") 
C)  They can contain spaces 
D)  They must make sense as a word

Question 11

Which one of the following is a correct representation of the given mathematical expression in Java?
$\frac{a + b}
2$

Accepted Answer

A)  a + b % 2 
B)  a + b / 2 
C)  a + (b / 2) 
D)  (a + b) / 2 
A)  a + b % 2 
B)  a + b / 2 
C)  a + (b / 2) 
D)  (a + b) / 2

Question 12

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

Accepted Answer

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

Question 13

What will be the value inside the variables a and b after the given set of assignments?
Int a = 20;
Int b = 10;
a = (a + b) / 2; 
b = a;
a++;

Accepted Answer

A)  a = 15, b = 16 
B)  a = 16, b = 16 
C)  a = 16, b = 15 
D)  a = 15, b = 15 
A)  a = 15, b = 16 
B)  a = 16, b = 16 
C)  a = 16, b = 15 
D)  a = 15, b = 15

Question 14

What does the following statement sequence print?
String str = "Java Is Good";
Int n = str.length();
String mystery = str.substring(n - 4, n) +
Str)charAt(4) + str.substring(0, 4);
System.out.println(mystery);

Accepted Answer

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

Question 15

Which of the following guidelines will make code more explanatory for others?

Accepted Answer

A)  Use more statements in source code. 
B)  Add comments to source code. 
C)  Avoid usage of complex calculations in source code. 
D)  Always enclose the statements in curly braces in source code. 
A)  Use more statements in source code. 
B)  Add comments to source code. 
C)  Avoid usage of complex calculations in source code. 
D)  Always enclose the statements in curly braces in source code.

Question 16

What output is produced by these statements?
String name = "Joanne Hunt";
System.out.println(name.length());

Accepted Answer

A)  8 
B)  10 
C)  9 
D)  11 
A)  8 
B)  10 
C)  9 
D)  11

Question 17

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

Accepted Answer

A)  int salary = 0;
Salary = 5000.50; 
B)  int salary1 = 0;
Salary1 = 1.2E6; 
C)  double salary2 = 0;
Salary2 = 2.96E-2; 
D)  long salary3 = 0;
Salary3 = 1E-6; 
A)  int salary = 0;
Salary = 5000.50; 
B)  int salary1 = 0;
Salary1 = 1.2E6; 
C)  double salary2 = 0;
Salary2 = 2.96E-2; 
D)  long salary3 = 0;
Salary3 = 1E-6;

Question 18

What does the following statement sequence print if the user input is 123?
Public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
String str = in.next();
Str += 456;
System.out.println(str);
}

Accepted Answer

A)  579 
B)  Compile-time error 
C)  Run-time error 
D)  123456 
A)  579 
B)  Compile-time error 
C)  Run-time error 
D)  123456

Question 19

Which one of the following types of statements is an instruction to replace the existing value of a variable with another value?

Accepted Answer

A)  Update 
B)  Declaration 
C)  Assignment 
D)  Initialization 
A)  Update 
B)  Declaration 
C)  Assignment 
D)  Initialization

Question 20

What is wrong with the following code snippet?

Accepted Answer

A)  The code snippet uses an uninitialized variable. 
B)  The code snippet uses an undeclared variable. 
C)  The code snippet attempts to assign a decimal value to an integer variable. 
D)  The code snippet attempts to add a number to a string variable. 
A)  The code snippet uses an uninitialized variable. 
B)  The code snippet uses an undeclared variable. 
C)  The code snippet attempts to assign a decimal value to an integer variable. 
D)  The code snippet attempts to add a number to a string variable.

Exam 2: Fundamental Data Types

What is the result of the following code snippet? Double bottles; Double bottleVolume = bottles * 2; System.out.println(bottleVolume);

Which is the Java equivalent of the following mathematical expression? C = √(a2 + b2)

Which one of the following statements can be used to convert a string str to a double?

Which of the methods below are static methods? I. length II. substring III. pow IV. sqrt

What will be the value inside the variables x and y after the given set of assignments? Int x = 20; Int y = 10; X = (x - y) * 2; Y = x / 2;

What is the output of the following code snippet? Public static void main(String[] args) { Int var1 = 10; Int var2 = 2; Int var3 = 20; Var3 = var3 / (var1 % var2); System.out.println(var3); }

What will be the value stored in the variable x after the execution of the following code snippet? Int a = 10; Int b = 20; Int c = 2; Int x = b / a /*c*/;

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

Which statement is true about variable names in Java?

Which one of the following is a correct representation of the given mathematical expression in Java? a+b2\frac{a + b}22a+b​

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

What will be the value inside the variables a and b after the given set of assignments? Int a = 20; Int b = 10; a = (a + b) / 2; b = a; a++;

What does the following statement sequence print? String str = "Java Is Good"; Int n = str.length(); String mystery = str.substring(n - 4, n) + Str)charAt(4) + str.substring(0, 4); System.out.println(mystery);

Which of the following guidelines will make code more explanatory for others?

What output is produced by these statements? String name = "Joanne Hunt"; System.out.println(name.length());

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

What does the following statement sequence print if the user input is 123? Public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Enter a number: "); String str = in.next(); Str += 456; System.out.println(str); }

Which one of the following types of statements is an instruction to replace the existing value of a variable with another value?

What is wrong with the following code snippet?

Introduction

Decisionseasy

Loops

Methods

Arrays and Arraylists

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Objects and Classes

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Graphical User Interfaces

Advanced User Interfaces

Object-Oriented Design

Recursion

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The Java Collections Framework

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Streams and Binary Inputoutput

Multithreading

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Which is the Java equivalent of the following mathematical expression? C = √(a² + b²)

What will be the value stored in the variable x after the execution of the following code snippet? Int a = 10; Int b = 20; Int c = 2; Int x = b / a /c/;

Which one of the following is a correct representation of the given mathematical expression in Java? $\frac{a + b}2$