Deck 3: Using Methods, Classes, and Objects

Question 1

An object is a ____ of a class.

A) constant
B) member
C) method
D) field

Answer 1

B

Question 2

Application classes frequently instantiate objects that use the objects of other classes.

Answer 2

True

Question 3

The interface is the part of a method that the method's client does not see.

Answer 3

False

Question 4

When a value is returned from a method, you are required to use the value when the method is called.

Question 5

You can identify a class that is an application because it contains a public static void main() method.

Question 6

An application's main() method must have a void return type.

Question 7

The method ____ is the first line of a method.

A) argument
B) address
C) statement
D) declaration

Question 8

The ____ method executes first in an application, regardless of where you physically place it within its class.

A) start()
B) run()
C) main()
D) execute()

Question 9

Any class can contain an unlimited number of methods.

Question 10

A(n) ____ causes a value to be sent from a called method back to the calling method.

A) return statement
B) method statement
C) instantiation
D) inheritance relationship

Question 11

A method body provides information about how other methods can interact with it.

Question 12

You can write your own constructor methods; but when you don't write a constructor method for a class object, Java writes one for you.

Question 13

The arguments in a method call are often referred to as ____.

A) constants
B) concept parameters
C) actual parameters
D) argument lists

Question 14

Data items you use in a call to a method are called ____.

A) arguments
B) instance variables
C) method declarations
D) headers

Question 15

A(n) ____ is a program module that contains a series of statements that carry out a task.

A) argument
B) method
C) application
D) declaration

Question 16

When a variable ceases to exist at the end of a method, programmers say the variable ____.

A) is undeclared
B) is out of memory range
C) goes out of scope
D) is lost

Question 17

A method's identifier must be more than one word, must have no embedded spaces, and cannot be a Java keyword.

Question 18

A(n) ____ variable is known only within the boundaries of the method.

A) method
B) local
C) double
D) instance

Question 19

____ is the encapsulation of method details within a class.

A) An interface
B) A calling method
C) Implementation hiding
D) Instantiation

Question 20

Parentheses in a method declaration contain parameters that are funneled into the method.

Question 21

When an application is run, the method that must be executed first must be named ____.

A) first()
B) void()
C) main()
D) final()

Question 22

To execute a method, you ____________________ it from another method.

Question 23

Assigning ____ to a field means that no other classes can access the field's values.

A) user rights
B) protected access
C) key access
D) private access

Question 24

Normally, you declare constructors to be ____________________ so that other classes can instantiate objects that belong to the class.

Question 25

The name of the ____ is always the same as the name of the class whose objects it creates.

A) method
B) constructor
C) argument
D) variable

Question 26

A(n) ____ constructor is one that requires no arguments.

A) class
B) default
C) explicit
D) write

Question 27

Method names that begin with ____ and set are very typical.

A) next
B) call
C) read
D) get

Question 28

____ parameters are variables in a method declaration that accept the values from the actual parameters.

A) System
B) Formal
C) Public
D) Static

Question 29

Which of the following is NOT an initial value assigned to an object's data field by a default constructor?

A) numeric fields set to 0
B) Boolean fields set to true
C) character fields set to Unicode '\u0000'
D) a field of object references set to null

Question 30

When you think in an object-oriented manner, everything is a(n) ____________________.

Question 31

Access specifiers are also called access ____________________.

Question 32

You are ____ required to write a constructor method for a class.

A) never
B) always
C) sometimes
D) often

Question 33

Methods that retrieve values are called ____ methods.

A) static
B) accessor
C) class
D) mutator

Question 34

For ease in locating class methods, many programmers store them in ____ order.

A) chronological
B) type
C) alphabetical
D) numeric

Question 35

A(n) ____________________ is a number appended to a field, typically an ID number or account number.

Question 36

Public classes are accessible by all objects, which means that public classes can be ____, or used as a basis for any other class.

A) saved
B) extended
C) copied
D) used

Question 37

In order to allocate memory for an object, you use the ____ operator.

A) new
B) main
C) type
D) return

Question 38

A unique identifier is most likely used as a ____ key in a database.

A) special
B) public
C) static
D) primary

Question 39

A(n) ____ method is a method that creates and initializes class objects.

A) constructor
B) accessor
C) non-static
D) instance

Question 40

Methods used with object instantiations are called ____ methods.

A) accessor
B) internal
C) static
D) instance

Question 41

Match each term with the correct statement below.

-The first line of a method

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 42

Match each term with the correct statement below.

-Variables in the method declaration that accept the values from the actual parameters

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 43

How does a programmer use a method?

Question 44

Match each term with the correct statement below.

-Data components of a class

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 45

Which is more important: the order in which you place methods' bodies, or the order in which you call methods? Please explain.

Question 46

What are the four components of a method header?

Question 47

When talking about inheritance, why do programmers use the phrase "is a"?

Question 48

How do you create an instance of a class? Provide an example.

Question 49

Match each term with the correct statement below.

-Variables you declare within a class, but outside of any method

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 50

Match each term with the correct statement below.

-Included within the method declaration parentheses

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 51

When the parentheses of a method are empty, what does this indicate?

Question 52

Match each term with the correct statement below.

-Are called class methods

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 53

Explain the difference between public access and private access when defining a class.

Question 54

Match each term with the correct statement below.

-The combination of the method name and the number, types, and order of arguments

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 55

Describe how you can use multiple arguments in a method.

Question 56

Why are hidden implementation methods often referred to as existing in a black box?

Question 57

Match each term with the correct statement below.

-An application or a class that instantiates objects of another prewritten class

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 58

What happens to a value returned from a method?

Question 59

Match each term with the correct statement below.

-Used to return a value back to the calling method

A)return statement
B)header
C)instance variables
D)method’s signature
E)formal parameters
F)static method
G)data fields
H)parameter type
I)class user

Question 60

Does a programmer need to write every class he or she uses? Why or why not?

Question 61

Parentheses - may contain data to be sent to the method, but may be empty if no outside data is required

Question 62

A major advantage of a method is that it is easily reusable. What does it mean to reuse a method and what are the advantages of doing so?

Question 63

Methods use memory locations to hold values of variables. Describe the process of memory allocation and variable scope.

Question 64

When creating a method that requires multiple parameters, why would a programmer need to understand a method's signature, and why must a method call match the called method's signature?

Question 65

public int getStudentNum()
{
return studentNum;
}
In the above code, identify if the method is a mutator method or an accessor method. Describe how the two types of methods differ and how they are similar.

Question 66

Explain the purpose of a return type of a method. Describe the return value of a method that returns no data.

Question 67

Describe fully qualified identifiers and explain why they are necessary.

Question 68

Write a valid class header with public access. Assign a legal identifier of your choice. Then write the body of the class that contains one data field named myPractice with a data type of double. Be sure to include any necessary curly braces and semicolons.