Chapter 5

Question 1

___ in a program can represent real-world things or abstractions

Answer 1

Objects

Question 2

An _____ of a class is an object

Answer 2

instance

Question 3

True or False, The class definition has no data—that is, no numbers and no string. The individual objects have the data, but the class specifies what kind of data they have. The class also specifies what actions the objects can take and how they accomplish those actions.

Answer 3

True

Question 4

the data items and the methods are sometimes called ___ because they belong to the object

Answer 4

members

Question 5

What are these called?
public String name;
public String breed;
public int age;

Answer 5

Instance Variables

Question 6

Why do we need the word new ?

Answer 6

we use to create objects of a class.

Question 7

What is nextInt is?

Answer 7

a method

Question 8

Methods that some preform action other than returning a value are called

Answer 8

void methods

Question 9

What is the formula to call a method?

Answer 9

You invoke a method by writing the name of the receiving object followed by a dot, the name of the method, and finally a set of parentheses that can contain arguments providing information for the method. Object.Method( );

Question 10

What is a Scanner?

Answer 10

Class

Question 11

True or False, Is it true that main is a void method?

Answer 11

true

Question 12

True or False. It is preferred to use one return statement in a method.

Answer 12

True

Question 13

Does Java have functions?

Answer 13

No, it doesnt

Question 14

Can a void method contain a return statement?

Answer 14

Since a void method returns no value, it typically does not have any return statement. However, you can write a return statement within a void method without an accompanying expression, as follows:

return;

Question 15

True or False, within a class definition, this is a name for the receiving object

Answer 15

True

Question 16

What is “ this “ can be used for?

Answer 16

you can use the keyword this as a name for the object receiving the method call

Question 17

Variables are confined to a method definition

Answer 17

local variables

Question 18

Variables are confined to an object of a class

Answer 18

instance variables

Question 19

A type of variables that Java does not have, but other programmes have

Answer 19

global variables.

Question 20

When you declare a variable within a compound statement, the compound statement is usually called

Answer 20

block

Question 21

The things that serve as blanks in methods are called

Answer 21

parameters

Question 22

Java passes arguments to a method using

Answer 22

call-by-value

Question 23

True or False, In Java, you can choose the name of a method’s formal parameter without any concern that this name will be the same as an identifier used in some other method. Formal parameters are really local variables, and so their meanings are confined to their respective method definitions.

Answer 23

True

Question 24

True or False. An argument in a method invocation that is of any of these types will automatically be converted to any of the types that appear to its right if that is needed to match a formal parameter:
byte→short→int→long→float→double

Answer 24

True

Question 25

Designing a method so that it can be used without any need the fine detail of the code is called

Answer 25

Information Hiding (also called “abstraction.”) .. or encapsulation groups instance variables and methods into a class

Question 26

A method’s _____ comment states the conditions that must be true before the method is invoked.

Answer 26

precondition

Question 27

The keywords public and private are examples of ____

Answer 27

access modifiers

Question 28

True or False, private methods are called only within their own class?

Answer 28

True

Question 29

True or False, Public instance variables can lead to the corruption of an object’s data?

Answer 29

True

Question 30

True or False, Private instance variables enable the class to restrict how they are accessed or changed

Answer 30

True

Question 31

Making all instance variables private does control access an instance to you have a legitimate reason to access an instance variable? For these cases, you should provide accessor methods called

Answer 31

getter

Question 32

What do getters do?

Answer 32

is simply a method that allows you to look at data contained in an instance variable.

Question 33

a method that allows you to change the data stored in private instance variables called?

Answer 33

setters

Question 34

True or False, A method body can contain an invocation of another method. The situation for this sort of method call is exactly the same as it would be if the method call had occurred in the main method of a program

Answer 34

True

Question 35

What is an ADT?

Answer 35

is short for abstract data type.

Question 36

comments result in neat HTML documentation called:

Answer 36

javadoc

Question 37

What does UML in UML Class Diagrams stands for?

Answer 37

Unified Modeling Language

Question 38

What does UML do?

Answer 38

UML is useful for designing and building a class

Question 39

Variables of a class type named?

Answer 39

objects

Question 40

Some programmers refer to the parameter mechanism for parameters of a class type as ______ parameter passing

Answer 40

call-by-reference

Question 41

What is Differences Between Primitive-Type and Class-Type Parameters?

Answer 41

A method cannot change the value of an argument of a primitive type that is passed to it. In addition, a method cannot replace an object passed to it as an argument with another object. On the other hand, a method can change the values of the instance variables of an argument of a class type.