Question 1

How many significant digits does a double variable have?

Accepted Answer

A) 7. 
B) 8. 
C) 14. 
D) 15. 
A) 7. 
B) 8. 
C) 14. 
D) 15. D

Question 2

Which of the following is a valid fully qualified name?

Accepted Answer

A) Scanner. 
B) java.Scanner. 
C) util.Scanner. 
D) java.util.Scanner. 
A) Scanner. 
B) java.Scanner. 
C) util.Scanner. 
D) java.util.Scanner. D

Question 3

Multiple parameters are separated with what symbol?

Accepted Answer

A) Dot separator 
B) Comma. 
C) Parentheses. 
D) Braces. 
A) Dot separator 
B) Comma. 
C) Parentheses. 
D) Braces. B

Question 4

Which class provides prebuilt dialog boxes that enable programs to display windows containing messages (such windows are called message dialogs)?

Accepted Answer

A) JDialogBox. 
B) JPrebuiltDialog. 
C) JMessageDialog. 
D) JOptionPane. 
A) JDialogBox. 
B) JPrebuiltDialog. 
C) JMessageDialog. 
D) JOptionPane.

Question 5

Which of the following statements is false?

Accepted Answer

A) You must create an object of class JOptionPane to use its static method showMessageDialog. 
B) JOptionPane method showInputDialog displays an input dialog containing a prompt and a field (known as a text field)in which a user can enter text. 
C) String method format works like method System.out.printf,except that format returns the formatted String rather than displaying it in a command window. 
D) An input dialog allows the user to enter data into a program. 
A) You must create an object of class JOptionPane to use its static method showMessageDialog. 
B) JOptionPane method showInputDialog displays an input dialog containing a prompt and a field (known as a text field)in which a user can enter text. 
C) String method format works like method System.out.printf,except that format returns the formatted String rather than displaying it in a command window. 
D) An input dialog allows the user to enter data into a program.

Question 6

A default constructor has how many parameters?

Accepted Answer

A) 0. 
B) 1. 
C) 2. 
D) a variable number. 
A) 0. 
B) 1. 
C) 2. 
D) a variable number.

Question 7

Method headers contain all of the following except:

Accepted Answer

A) Access modifier. 
B) Left brace. 
C) Name of method. 
D) Return type. 
A) Access modifier. 
B) Left brace. 
C) Name of method. 
D) Return type.

Question 8

Which class provides prebuilt dialog boxes that enable programs to display windows containing messages (such windows are called message dialogs)?

Accepted Answer

A) JDialogBox. 
B) JPrebuiltDialog. 
C) JMessageDialog. 
D) JOptionPane. 
A) JDialogBox. 
B) JPrebuiltDialog. 
C) JMessageDialog. 
D) JOptionPane.

Question 9

What is the default initial value of a String instance variable?

Accepted Answer

A) "" 
B) "default" 
C) default 
D) null 
A) "" 
B) "default" 
C) default 
D) null

Question 10

Attributes of a class are also known as:

Accepted Answer

A) Constructors. 
B) Local variables. 
C) Fields. 
D) Classes. 
A) Constructors. 
B) Local variables. 
C) Fields. 
D) Classes.

Question 11

What type of methods allow a client of a class to assign values to a private instance variable?

Accepted Answer

A) Get methods. 
B) Replace methods. 
C) Assign methods. 
D) Set methods. 
A) Get methods. 
B) Replace methods. 
C) Assign methods. 
D) Set methods.

Question 12

What is the difference between a float and a double?

Accepted Answer

A) double variables store integers and float variables store floating-point numbers. 
B) double variables store numbers with smaller magnitude and coarser detail. 
C) double variables store numbers with larger magnitude and finer detail. 
D) None of the above. 
A) double variables store integers and float variables store floating-point numbers. 
B) double variables store numbers with smaller magnitude and coarser detail. 
C) double variables store numbers with larger magnitude and finer detail. 
D) None of the above.

Question 13

A class instance creation expression contains:

Accepted Answer

A) Parentheses. 
B) The new keyword. 
C) The name of the class. 
D) All of the above. 
A) Parentheses. 
B) The new keyword. 
C) The name of the class. 
D) All of the above.

Question 14

Which of the following is a Scanner method?

Accepted Answer

A) nextLine. 
B) nextText. 
C) nextWord. 
D) readNext. 
A) nextLine. 
B) nextText. 
C) nextWord. 
D) readNext.

Question 15

What is the name of the values the method call passes to the method for the parameters?

Accepted Answer

A) Arguments. 
B) References. 
C) Objects. 
D) Values. 
A) Arguments. 
B) References. 
C) Objects. 
D) Values.

Question 16

Which two Java primitive types store floating-point numbers?

Accepted Answer

A) decimal and float. 
B) point and double. 
C) float and double. 
D) decimal and point. 
A) decimal and float. 
B) point and double. 
C) float and double. 
D) decimal and point.

Question 17

What is the default value of a reference?

Accepted Answer

A) 0. 
B) "". 
C) null. 
D) default. 
A) 0. 
B) "". 
C) null. 
D) default.

Question 18

How many significant digits does a double variable have?

Accepted Answer

A) 7. 
B) 8. 
C) 14. 
D) 15. 
A) 7. 
B) 8. 
C) 14. 
D) 15.

Exam 3: Introduction to Classes and Objects

How many significant digits does a double variable have?

Which of the following is a valid fully qualified name?

Multiple parameters are separated with what symbol?

Which class provides prebuilt dialog boxes that enable programs to display windows containing messages (such windows are called message dialogs)?

Which of the following statements is false?

A default constructor has how many parameters?

Method headers contain all of the following except:

Which class provides prebuilt dialog boxes that enable programs to display windows containing messages (such windows are called message dialogs)?

What is the default initial value of a String instance variable?

Attributes of a class are also known as:

What type of methods allow a client of a class to assign values to a private instance variable?

What is the difference between a float and a double?

A class instance creation expression contains:

Which of the following is a Scanner method?

What is the name of the values the method call passes to the method for the parameters?

Which two Java primitive types store floating-point numbers?

What is the default value of a reference?

How many significant digits does a double variable have?

Introduction to Computers and Java

Introduction to Java Applications

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Atm Case Study,part 1: Object-Oriented Design With the Uml

Atm Case Study,part 2: Implementing an Object-Oriented Design

Gui Components: Part 1

Graphics and Java 2d

Strings

Files,streams and Object Serialization

Recursion

Searching, Sorting and Big O

Generic Collections

Generic Classes and Methods

Custom Generic Data Structures

Applets and Java Web Start

Multimedia: Applets and Applications

Gui, Part 2

Multithreading

Networking

Accessing Databases With Jdbc

Java Server Faces Web Applications

Ajax-Enabled Jsf Web Applications

Web Services

Filters