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 wrong with the following code?
int count = 2000 * 3000 * 4000;

Accepted Answer

A) Wrong data type 
B) Variable is undefined 
C) Integer overflow 
D) Illegal expression 
A) Wrong data type 
B) Variable is undefined 
C) Integer overflow 
D) Illegal expression

Question 3

What is the output of the following code snippet?

Accepted Answer

A) Ha 
B) Har 
C) Hy 
D) Hry 
A) Ha 
B) Har 
C) Hy 
D) Hry

Question 4

What will be printed by the statements below?

Accepted Answer

A) x = 23, y = 46 
B) x = 23, y = 40 
C) x = 46, y = 46 
D) x = 3, y = 2 
A) x = 23, y = 46 
B) x = 23, y = 40 
C) x = 46, y = 46 
D) x = 3, y = 2

Question 5

What is result of evaluating the following expression?

Accepted Answer

A) 2 
B) 7 
C) 2.5 
D) 3 
A) 2 
B) 7 
C) 2.5 
D) 3

Question 6

Which of the following statements will assign the largest value of three integer variables a, b, and c to the integer variable maximum?

Accepted Answer

A)  maximum = Math.max (a, b, c); 
B)  maximum=Math.max (a, b);
maximum= Math.(b, c);
maximum=Math.max (a, c); 
C)  maximum = Math.max (a, b);
maximum = Math. max (maximum, c); 
D)  maximum = Math.max (a, b)+ Math.max (b, c)+ Math.max (a, c); 
A)  maximum = Math.max (a, b, c); 
B)  maximum=Math.max (a, b);
maximum= Math.(b, c);
maximum=Math.max (a, c); 
C)  maximum = Math.max (a, b);
maximum = Math. max (maximum, c); 
D)  maximum = Math.max (a, b)+ Math.max (b, c)+ Math.max (a, c);

Question 7

What is the value of the following expression?
1 % 12

Accepted Answer

A) 1 
B) 0 
C) -11 
D) This is an error because 12 is greater than 1 
A) 1 
B) 0 
C) -11 
D) This is an error because 12 is greater than 1

Question 8

What will be printed by the statements below?

Accepted Answer

A) x = 20, y = 20 
B) x = 21, y = 20 
C) x = 20, y = 19 
D) x = 21, y = 19 
A) x = 20, y = 20 
B) x = 21, y = 20 
C) x = 20, y = 19 
D) x = 21, y = 19

Question 9

What (if any) type of error occurs with the following code if the user input is ABC?

Accepted Answer

A) Compile-time error 
B) Run-time error 
C) Overflow error 
D) Illegal expression 
A) Compile-time error 
B) Run-time error 
C) Overflow error 
D) Illegal expression

Question 10

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.

Question 11

What output is produced by these statements?

Accepted Answer

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

Question 12

What is the output of the following code snippet?
final String str = "Java";
str += " is powerful";
System.out.println(str);

Accepted Answer

A) Java is powerful 
B) Java + is powerful 
C) is powerful 
D) Nothing; compile-time error 
A) Java is powerful 
B) Java + is powerful 
C) is powerful 
D) Nothing; compile-time error

Question 13

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

Accepted Answer

A) Use shorter statements and shorter variable names 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 shorter statements and shorter variable names 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 14

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 15

What is the output of the following code snippet?

Accepted Answer

A) OVE MY 
B) OVE MY C 
C) VE MY CO 
D) VE MY C 
A) OVE MY 
B) OVE MY C 
C) VE MY CO 
D) VE MY C

Question 16

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 17

What is the output of the following code snippet?

Accepted Answer

A) 25.0 
B) 337.0 
C) 7.0 
D) 19.0 
A) 25.0 
B) 337.0 
C) 7.0 
D) 19.0

Question 18

Which operator is used to concatenate two or more strings?

Accepted Answer

A) + 
B) % 
C) & 
D) ^ 
A) + 
B) % 
C) & 
D) ^

Question 19

What will be the value of the variables a and b after the given set of assignments?

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 20

What is the output of the following code snippet?

Accepted Answer

A) Java is powerful 
B) Java + is powerful 
C) is powerful 
D) Compile-time error 
A) Java is powerful 
B) Java + is powerful 
C) is powerful 
D) Compile-time error

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 wrong with the following code? int count = 2000 * 3000 * 4000;

What is the output of the following code snippet?

What will be printed by the statements below?

What is result of evaluating the following expression?

Which of the following statements will assign the largest value of three integer variables a, b, and c to the integer variable maximum?

What is the value of the following expression? 1 % 12

What will be printed by the statements below?

What (if any) type of error occurs with the following code if the user input is ABC?

What is wrong with the following code snippet?

What output is produced by these statements?

What is the output of the following code snippet? final String str = "Java"; str += " is powerful"; System.out.println(str);

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

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?

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

What is the output of the following code snippet?

Which operator is used to concatenate two or more strings?

What will be the value of the variables a and b after the given set of assignments?

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

Filters