Question 1

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 2

Consider the following Java variable names:
I. 1stInstance
II. basicInt%
III. empName_
IV. addressLine1
V. DISCOUNT
Which of the following options is correct?

Accepted Answer

A)  Only IV is a valid Java variable name. 
B)  Only I and IV are valid Java variable names. 
C)  Only I, IV, and V are valid Java variable names. 
D)  Only III, IV, and V are valid Java variable names. 
A)  Only IV is a valid Java variable name. 
B)  Only I and IV are valid Java variable names. 
C)  Only I, IV, and V are valid Java variable names. 
D)  Only III, IV, and V are valid Java variable names.

Question 3

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 4

Which of the following options declares a float variable?

Accepted Answer

A)  Float age; 
B)  flt age; 
C)  float age; 
D)  age: float; 
A)  Float age; 
B)  flt age; 
C)  float age; 
D)  age: float;

Question 5

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 6

What does the following statement sequence print? String str = "Java";
Str += " is powerful";
System.out.println(str);

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

Question 7

What is the correct way to invoke methods on variables in Java that are strings?

Accepted Answer

A)  Methods can only be invoked on string constants, not on variables. 
B)  For each method there is a special operator that must be used. 
C)  There are no methods available in Java for string variables. 
D)  Invoke them using the variable name and the dot (.) notation. 
A)  Methods can only be invoked on string constants, not on variables. 
B)  For each method there is a special operator that must be used. 
C)  There are no methods available in Java for string variables. 
D)  Invoke them using the variable name and the dot (.) notation.

Question 8

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 9

What is the output of the following code snippet? String firstname = "William";
String lastname;
System.out.println("First: " + first);
System.out.println("Last: " + lastname);

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

Question 10

What is result of evaluating the following expression? (45 / 6) % 5

Accepted Answer

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

Question 11

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 ");
Int myInt = in.nextInt();
MyInt += 456;
System.out.println(myInt);
}

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 12

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

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 7)5 
A) 5 
B) 6 
C) 7 
D) 7)5

Question 13

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 14

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 15

Assuming that the user inputs a value of 30 for the price and 10 for the discount rate in the following code snippet, what is the output? Scanner in = new Scanner(System.in);
System.out.print("Enter the price: ");
Double price = in.nextDouble();
System.out.print("Enter the discount rate: ");
Double discount = in.nextDouble();
System.out.print("The new price is ");
System.out.println(price - price * (discount / 100.0));

Accepted Answer

A)  The new price is 30.0 
B)  The new price is 20.0 
C)  The new price is 27.0 
D)  The new price is 33.0 
A)  The new price is 30.0 
B)  The new price is 20.0 
C)  The new price is 27.0 
D)  The new price is 33.0

Question 16

What is the meaning of x = 0; in Java?

Accepted Answer

A)  It checks whether x equals 0. 
B)  It sets the variable x to zero. 
C)  It defines a variable named x and initializes it with 0. 
D)  It is a syntax error because x is not always 0. 
A)  It checks whether x equals 0. 
B)  It sets the variable x to zero. 
C)  It defines a variable named x and initializes it with 0. 
D)  It is a syntax error because x is not always 0.

Question 17

What is wrong with the following code snippet?
Int size = 42;
Cost = 9.99;
System.out.println("size = " + size);
System.out.println(" cost = " + cost);

Accepted Answer

A)  The code snippet uses a variable that has not yet been initialized. 
B)  The code snippet uses a variable that has not been declared. 
C)  The code snippet attempts to assign a decimal value to an integer variable. 
D)  The code snippet attempts to assign an integer value to a decimal variable. 
A)  The code snippet uses a variable that has not yet been initialized. 
B)  The code snippet uses a variable that has not been declared. 
C)  The code snippet attempts to assign a decimal value to an integer variable. 
D)  The code snippet attempts to assign an integer value to a decimal variable.

Question 18

What will be printed by the statements below? final int BONUS = 20;
Int salary = 100;
Int netSalary = salary + BONUS;
System.out.print (netSalary);

Accepted Answer

A) salaryBONUS 
B) 120 
C) 100BONUS 
D)  Nothing will be printed because constants cannot be used in expressions. 
A) salaryBONUS 
B) 120 
C) 100BONUS 
D)  Nothing will be printed because constants cannot be used in expressions.

Question 19

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 20

Assume the following variable has been declared and given values as shown: String name = "Mamey, Jean";
Which statement will print the name as "Jean Mamey"?

Accepted Answer

A)  System.out.print (name.substring(7) + " "
+ name.substring(0, 5)); 
B)  System.out.print (name.substring(8, 4) + " "
+ name.substring(1, 5)); 
C)  System.out.print (name.substring(8) + " "
+ name.substring(1, 4)); 
D)  System.out.print (name.substring(2) + " "
+ name.substring(1)); 
A)  System.out.print (name.substring(7) + " "
+ name.substring(0, 5)); 
B)  System.out.print (name.substring(8, 4) + " "
+ name.substring(1, 5)); 
C)  System.out.print (name.substring(8) + " "
+ name.substring(1, 4)); 
D)  System.out.print (name.substring(2) + " "
+ name.substring(1));

Exam 4: Fundamental Data Types

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*/;

Consider the following Java variable names: I. 1stInstance II. basicInt% III. empName_ IV. addressLine1 V. DISCOUNT Which of the following options is correct?

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

Which of the following options declares a float variable?

The assignment operator

What does the following statement sequence print? String str = "Java"; Str += " is powerful"; System.out.println(str);

What is the correct way to invoke methods on variables in Java that are strings?

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

What is the output of the following code snippet? String firstname = "William"; String lastname; System.out.println("First: " + first); System.out.println("Last: " + lastname);

What is result of evaluating the following expression? (45 / 6) % 5

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 "); Int myInt = in.nextInt(); MyInt += 456; System.out.println(myInt); }

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

What is wrong with the following code? Int count = 2000 * 3000 * 4000;

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

What is the meaning of x = 0; in Java?

What is wrong with the following code snippet? Int size = 42; Cost = 9.99; System.out.println("size = " + size); System.out.println(" cost = " + cost);

What will be printed by the statements below? final int BONUS = 20; Int salary = 100; Int netSalary = salary + BONUS; System.out.print (netSalary);

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

Assume the following variable has been declared and given values as shown: String name = "Mamey, Jean"; Which statement will print the name as "Jean Mamey"?

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

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/;