Question 1

Which of the following statements is false?

Accepted Answer

A) A reference to an object is required to invoke an object's methods. 
B) A primitive-type variable does not refer to an object. 
C) Reference-type instance variables are initialized by default to the value void. 
D) A primitive-type variable cannot be used to invoke a method. 
A) A reference to an object is required to invoke an object's methods. 
B) A primitive-type variable does not refer to an object. 
C) Reference-type instance variables are initialized by default to the value void. 
D) A primitive-type variable cannot be used to invoke a method.

Question 2

Java requires a ________ call for every object that's created.

Accepted Answer

A) constructor 
B) destructor 
C) parameterless 
D) parameterized 
A) constructor 
B) destructor 
C) parameterless 
D) parameterized

Question 3

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 4

Which of the following statements is false?

Accepted Answer

A) By convention class names begin with an uppercase letter,and method and variable names begin with a lowercase letter. 
B) Instance variables exist before methods are called on an object,while the methods are executing and after the methods complete execution. 
C) A class normally contains one or more methods that manipulate the instance variables that belong to particular objects of the class. 
D) Instance variables can be declared anywhere inside a class. 
A) By convention class names begin with an uppercase letter,and method and variable names begin with a lowercase letter. 
B) Instance variables exist before methods are called on an object,while the methods are executing and after the methods complete execution. 
C) A class normally contains one or more methods that manipulate the instance variables that belong to particular objects of the class. 
D) Instance variables can be declared anywhere inside a class.

Question 5

Which of the following statements is false?

Accepted Answer

A) A primitive-type variable can store exactly one value of its declared type at a time. 
B) Primitive-type instance variables are initialized by default. 
C) Variables of types byte,char,short,int,long,float and double are initialized to 0. 
D) Variables of type boolean are initialized to true. 
A) A primitive-type variable can store exactly one value of its declared type at a time. 
B) Primitive-type instance variables are initialized by default. 
C) Variables of types byte,char,short,int,long,float and double are initialized to 0. 
D) Variables of type boolean are initialized to true.

Question 6

When a method terminates,the values of its local variables are ________.

Accepted Answer

A) saved 
B) copied 
C) restored 
D) lost 
A) saved 
B) copied 
C) restored 
D) lost

Question 7

You can declare new classes as needed;this is one reason Java is known as a(n)________ language.

Accepted Answer

A) portable 
B) incremental 
C) extensible 
D) virtual 
A) portable 
B) incremental 
C) extensible 
D) virtual

Question 8

Which of the following statements is true?

Accepted Answer

A) The UML models a parameter of an operation by listing the parameter name,followed by a colon and the parameter value between the parentheses after the operation name. 
B) The UML indicates an operation's return type by placing a colon and the return value after the parentheses following the operation name. 
C) UML class diagrams do not specify return types for operations that do not return values. 
D) Declaring instance variables public is known as data hiding or information hiding. 
A) The UML models a parameter of an operation by listing the parameter name,followed by a colon and the parameter value between the parentheses after the operation name. 
B) The UML indicates an operation's return type by placing a colon and the return value after the parentheses following the operation name. 
C) UML class diagrams do not specify return types for operations that do not return values. 
D) Declaring instance variables public is known as data hiding or information hiding.

Question 9

Which of the following statements is false?

Accepted Answer

A) Variables declared in the body of a particular method are local variables and can be used only in that method. 
B) A method's parameters are local variables of the method. 
C) Every method's body is delimited by left and right braces ({ and }). 
D) Keyword null indicates that a method will perform a task but will not return any information. 
A) Variables declared in the body of a particular method are local variables and can be used only in that method. 
B) A method's parameters are local variables of the method. 
C) Every method's body is delimited by left and right braces ({ and }). 
D) Keyword null indicates that a method will perform a task but will not return any information.

Question 10

Which of the following statements is false?

Accepted Answer

A) The javac command can compile multiple classes at once;simply list the source-code filenames after the command with each filename separated by a comma from the next. 
B) If the directory containing the app includes only one app's files,you can compile all of its classes with the command javac *.java. 
C) The asterisk (*)in javac *.java indicates that all files in the current directory ending with the filename extension ".java" should be compiled. 
D) All of the above are true. 
A) The javac command can compile multiple classes at once;simply list the source-code filenames after the command with each filename separated by a comma from the next. 
B) If the directory containing the app includes only one app's files,you can compile all of its classes with the command javac *.java. 
C) The asterisk (*)in javac *.java indicates that all files in the current directory ending with the filename extension ".java" should be compiled. 
D) All of the above are true.

Question 11

Which of the following statements is false?

Accepted Answer

A) Scanner method next reads characters until any white-space character is encountered,then returns the characters as a String. 
B) To call a method of an object,follow the object name with a comma,the method name and a set of parentheses containing the method's arguments. 
C) A class instance creation expression begins with keyword new and creates a new object. 
D) A constructor is similar to a method but is called implicitly by the new operator to initialize an object's instance variables at the time the object is created. 
A) Scanner method next reads characters until any white-space character is encountered,then returns the characters as a String. 
B) To call a method of an object,follow the object name with a comma,the method name and a set of parentheses containing the method's arguments. 
C) A class instance creation expression begins with keyword new and creates a new object. 
D) A constructor is similar to a method but is called implicitly by the new operator to initialize an object's instance variables at the time the object is created.

Question 12

Which of the following statements is true?

Accepted Answer

A) Each object (instance)of the class shares the class's instance variables. 
B) Most instance-variable declarations are preceded with the keyword public,which is an access modifier. 
C) Variables or methods declared with access modifier private are accessible only to methods of the class in which they're declared. 
D) None of the above is true. 
A) Each object (instance)of the class shares the class's instance variables. 
B) Most instance-variable declarations are preceded with the keyword public,which is an access modifier. 
C) Variables or methods declared with access modifier private are accessible only to methods of the class in which they're declared. 
D) None of the above is true.

Question 13

A __________ of a class called myClass is another class whose methods call the methods of myClass.

Accepted Answer

A) consumer 
B) servant 
C) caller 
D) client 
A) consumer 
B) servant 
C) caller 
D) client

Question 14

Declaring instance variables ________ is known as data hiding or information hiding.

Accepted Answer

A) secure 
B) private 
C) static 
D) masked 
A) secure 
B) private 
C) static 
D) masked

Which of the following statements is false?

Java requires a ________ call for every object that's created.

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?

Which of the following statements is false?

When a method terminates,the values of its local variables are ________.

You can declare new classes as needed;this is one reason Java is known as a(n)________ language.

Which of the following statements is true?

Which of the following statements is false?

Which of the following statements is false?

Which of the following statements is false?

Which of the following statements is true?

A __________ of a class called myClass is another class whose methods call the methods of myClass.

Declaring instance variables ________ is known as data hiding or information hiding.

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

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters

Exam 3: Introduction to Classes and Objects

Which of the following statements is false?

Java requires a ________ call for every object that's created.

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?

Which of the following statements is false?

When a method terminates,the values of its local variables are ________.

You can declare new classes as needed;this is one reason Java is known as a(n)________ language.

Which of the following statements is true?

Which of the following statements is false?

Which of the following statements is false?

Which of the following statements is false?

Which of the following statements is true?

A __________ of a class called myClass is another class whose methods call the methods of myClass.

Declaring instance variables ________ is known as data hiding or information hiding.

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

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Concurrency

Accessing Databases With Jdbc

JavaFX

Filters