Question 1

The classpath consists of a list of directories or archive files,each separated by a ________ on Windows or a ________ on UNIX/Linux/Max OS X.

Accepted Answer

A) colon (:),semicolon (;). 
B) semicolon (;),colon (:). 
C) comma (,),semicolon (;). 
D) semicolon (;),comma (,). 
A) colon (:),semicolon (;). 
B) semicolon (;),colon (:). 
C) comma (,),semicolon (;). 
D) semicolon (;),comma (,). B

Question 2

A class within a package must be declared public if

Accepted Answer

A) It will be used only by other classes in the same package. 
B) It will be used by classes that are not in the same package. 
C) It is in the same directory as the other classes in the package. 
D) It has a unique name. 
A) It will be used only by other classes in the same package. 
B) It will be used by classes that are not in the same package. 
C) It is in the same directory as the other classes in the package. 
D) It has a unique name. B

Question 3

Static class variables:

Accepted Answer

A) are final. 
B) are public. 
C) are private. 
D) are shared by all objects of a class. 
A) are final. 
B) are public. 
C) are private. 
D) are shared by all objects of a class. D

Question 4

Which statement is false?

Accepted Answer

A) The compiler always creates a default constructor for a class. 
B) If a class's constructors all require arguments and a program attempts to call a no-argument constructor to initialize an object of the class,a compilation error occurs. 
C) A constructor can be called with no arguments only if the class does not have any constructors or if the class has a public no-argument constructor. 
D) None of the above. 
A) The compiler always creates a default constructor for a class. 
B) If a class's constructors all require arguments and a program attempts to call a no-argument constructor to initialize an object of the class,a compilation error occurs. 
C) A constructor can be called with no arguments only if the class does not have any constructors or if the class has a public no-argument constructor. 
D) None of the above.

Question 5

Which method returns an array of the enum's constants?

Accepted Answer

A) values. 
B) getValues. 
C) constants. 
D) getConstants. 
A) values. 
B) getValues. 
C) constants. 
D) getConstants.

Question 6

The import declaration import java.util.*;is known as a ________.

Accepted Answer

A) single-type-import declaration. 
B) all-type-import declaration. 
C) multiple-import declaration. 
D) type-import-on-demand declaration. 
A) single-type-import declaration. 
B) all-type-import declaration. 
C) multiple-import declaration. 
D) type-import-on-demand declaration.

Question 7

A final field should also be declared ________ if it is initialized in its declaration.

Accepted Answer

A) private. 
B) public. 
C) protected. 
D) static. 
A) private. 
B) public. 
C) protected. 
D) static.

Question 8

By default,the classpath consists only of the ________.However,the classpath can be modified by providing the ________ option to the javac compiler.

Accepted Answer

A) root directory of the package,-d. 
B) current directory,-d. 
C) root directory of the package,-classpath. 
D) current directory,-classpath. 
A) root directory of the package,-d. 
B) current directory,-d. 
C) root directory of the package,-classpath. 
D) current directory,-classpath.

Question 9

Which of the following is false?

Accepted Answer

A) A static method must be used to access private static instance variables. 
B) A static method has no this reference. 
C) A static method can be accessed even when no objects of its class have been instantiated. 
D) A static method can call instance methods directly. 
A) A static method must be used to access private static instance variables. 
B) A static method has no this reference. 
C) A static method can be accessed even when no objects of its class have been instantiated. 
D) A static method can call instance methods directly.

Question 10

A programmer-defined constructor that has no arguments is called a(n)________.

Accepted Answer

A) empty constructor. 
B) no-argument constructor. 
C) default constructor. 
D) null constructor. 
A) empty constructor. 
B) no-argument constructor. 
C) default constructor. 
D) null constructor.

Question 11

Having a this reference allows:

Accepted Answer

A) a method to refer explicitly to the instance variables and other methods of the object on which the method was called. 
B) a method to refer implicitly to the instance variables and other methods of the object on which the method was called. 
C) an object to reference itself. 
D) All of the above. 
A) a method to refer explicitly to the instance variables and other methods of the object on which the method was called. 
B) a method to refer implicitly to the instance variables and other methods of the object on which the method was called. 
C) an object to reference itself. 
D) All of the above.

Question 12

When should a program explicitly use the this reference?

Accepted Answer

A) Accessing a private variable. 
B) Accessing a public variable. 
C) Accessing a local variable. 
D) Accessing a field that is shadowed by a local variable. 
A) Accessing a private variable. 
B) Accessing a public variable. 
C) Accessing a local variable. 
D) Accessing a field that is shadowed by a local variable.

Question 13

The import declaration import *;________.

Accepted Answer

A) causes a compilation error. 
B) imports all classes in the library. 
C) imports the default classes in the library. 
D) imports the classes in package java.lang. 
A) causes a compilation error. 
B) imports all classes in the library. 
C) imports the default classes in the library. 
D) imports the classes in package java.lang.

Question 14

Instance variables declared final do not or cannot:

Accepted Answer

A) Cause syntax errors if used as a left-hand value. 
B) Be initialized. 
C) Be modified. 
D) None of the above. 
A) Cause syntax errors if used as a left-hand value. 
B) Be initialized. 
C) Be modified. 
D) None of the above.

Question 15

Set methods are also commonly called ________ methods and get methods are also commonly called ________ methods.

Accepted Answer

A) query,mutator. 
B) accessor,mutator. 
C) mutator,accessor. 
D) query,accessor. 
A) query,mutator. 
B) accessor,mutator. 
C) mutator,accessor. 
D) query,accessor.

Question 16

When compiling a class in a package,the javac command-line option ________ causes the javac compiler to create appropriate directories based on the class's package declaration.

Accepted Answer

A) -p. 
B) -a. 
C) -d. 
D) -dir. 
A) -p. 
B) -a. 
C) -d. 
D) -dir.

Question 17

Which statement is false?

Accepted Answer

A) The actual data representation used within the class is of no concern to the class's clients. 
B) Clients generally care about what the class does but not how the class does it. 
C) Clients are usually involved in a class's implementation. 
D) Hiding the implementation reduces the possibility that clients will become dependent on class-implementation details. 
A) The actual data representation used within the class is of no concern to the class's clients. 
B) Clients generally care about what the class does but not how the class does it. 
C) Clients are usually involved in a class's implementation. 
D) Hiding the implementation reduces the possibility that clients will become dependent on class-implementation details.

Question 18

The _________ of a class are also called the public services or the public interface that the class provides to its clients.

Accepted Answer

A) public constructors. 
B) public instance variables. 
C) public methods. 
D) All of the above. 
A) public constructors. 
B) public instance variables. 
C) public methods. 
D) All of the above.

Question 19

Enum types are implicitly ________ and enum constants are implicitly ________.

Accepted Answer

A) final,static. 
B) static,static. 
C) static,final. 
D) final,final. 
A) final,static. 
B) static,static. 
C) static,final. 
D) final,final.

Question 20

When no access modifier is specified for a method or variable,the method or variable:

Accepted Answer

A) Is public. 
B) Is private. 
C) Has package access. 
D) Is static. 
A) Is public. 
B) Is private. 
C) Has package access. 
D) Is static.

Exam 8: Classes and Objects: a Deeper Look

The classpath consists of a list of directories or archive files,each separated by a ________ on Windows or a ________ on UNIX/Linux/Max OS X.

A class within a package must be declared public if

Static class variables:

Which statement is false?

Which method returns an array of the enum's constants?

The import declaration import java.util.*;is known as a ________.

A final field should also be declared ________ if it is initialized in its declaration.

By default,the classpath consists only of the ________.However,the classpath can be modified by providing the ________ option to the javac compiler.

Which of the following is false?

A programmer-defined constructor that has no arguments is called a(n)________.

Having a this reference allows:

When should a program explicitly use the this reference?

The import declaration import *;________.

Instance variables declared final do not or cannot:

Set methods are also commonly called ________ methods and get methods are also commonly called ________ methods.

When compiling a class in a package,the javac command-line option ________ causes the javac compiler to create appropriate directories based on the class's package declaration.

Which statement is false?

The _________ of a class are also called the public services or the public interface that the class provides to its clients.

Enum types are implicitly ________ and enum constants are implicitly ________.

When no access modifier is specified for a method or variable,the method or variable:

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

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

The classpath consists of a list of directories or archive files,each separated by a on Windows or a on UNIX/Linux/Max OS X.

By default,the classpath consists only of the .However,the classpath can be modified by providing the option to the javac compiler.

Set methods are also commonly called methods and get methods are also commonly called methods.

Enum types are implicitly and enum constants are implicitly .