Deck 3: Using Methods, Classes and Objects

Question 1

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

Answer 1

B

Question 2

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

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

Answer 2

A

Question 3

Every object is a _____ of a more general class.

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

Answer 3

B

Question 4

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 5

A method's identifier must be more than one word, must have embedded spaces, and can be a Java keyword.

Question 6

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 7

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

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

Question 8

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 9

Any class can contain an unlimited number of methods.

Question 10

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

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

Question 11

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

Question 12

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

Question 13

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 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

A method header is also called a(n) _____.

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

Question 19

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

Question 20

____ is a principle of object-oriented programming that describes the encapsulation of method details within a class.

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

Question 21

Access specifiers are sometimes called access____.

A) modifiers
B) bodies
C) initializers
D) declarations

Question 22

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

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

Question 23

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

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

Question 24

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 25

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

A) declare
B) define
C) invoke
D) initialize

Question 26

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 27

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

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

Question 28

After an object has been instantiated, its methods can be accessed using the object's _____, a dot, and a method call.

A) identifier
B) class
C) operator
D) output

Question 29

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

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

Question 30

Methods that retrieve values are called ____ methods.

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

Question 31

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

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

Question 32

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

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

Question 33

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

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

Question 34

A(n)  ____ is a type whose implementation is hidden and accessed through its public methods.

A) constructor
B) abstract data type
C) method body
D) reserved type

Question 35

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 36

Often, programmers list the ____  first because it is the first method used when an object is created.

A) mutator method
B) accessor method
C) main
D) constructor

Question 37

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

A) reserved
B) private
C) public
D) default

Question 38

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

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

Question 39

Methods used with object instantiations are called ____ methods.

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

Question 40

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

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

Question 47

Hidden implementation methods are often referred to as existing in a(n) ____.

A) black box
B) static class
C) default class
D) interface

Question 48

The arguments in a method call are often referred to as ____ . The variables in the method declaration that accept the values from the actual parameters are ____.

A) call parameters, called parameters
B) formal parameters,  actual parameters
C) default parameters, formal parameters
D) actual parameters,   formal parameters

Question 51

An empty method is called a ____.

A) default method
B) predefined method
C) stub
D) signature

Question 55

A(n) ____ includes the class name, a dot, and the method name.

A) constant
B) static method
C) method header
D) fully qualified identifier

Question 57

A(n) ____ describes the type of data the method sends back to its calling method.

A) access specifier
B) actual parameter
C) return type
D) instance method

Question 61

Describe what a public access class is and when you would use one. 

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

What are the possible results if arguments to a method are passed in the wrong order?

Question 64

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

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

How do you use a value returned from a method? Provide an example.

Question 67

Describe instantiation and how it relates to 'is-a relationships.'

Question 68

What is a method and how is one used?

Question 69

Describe how you can use multiple arguments in a method. Provide an example.

Question 70

public class Employee
{
   private int empNum;
   private double empSalary;
​
   public void setEmpNum(int emp)
   {
      empNum = emp;
   } 
   public void setEmpSalary(double sal)
   {
      empSalary = sal;
   }
}
Given the class defined in the code above, write the Java statements that will create a new employee instance called employee15 and assign an empNum of 15 and empSalar y of 500.00 to that employee instance.

Question 71

What is the difference between a mutator method and an accessor method? Provide an example of each.

Question 72

What are the four components of a method header?

Question 73

public Employee()
{
empSalary = 300.00;
}
​ The above code shows the Employee class constructor. What is a constructor and how would this default constructor operate?

Question 74

How does the order in which methods appear in a class affect how the application executes? Please explain.

Question 75

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

Question 76

What are the two parts of every method? Describe them.

Question 77

Write a valid class header with public access. Assign a valid 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.

Question 78

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 79

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