Java

Front 1

What does "this" represent in getters and setters

Back 1

Denotes a reference to an implicit Parameter and to call another constructor of the same class

Front 2

A class typically contains what 3 things

Back 2

fields for data
constructors to create objects
methods getters and setters
in that order

Front 3

What does the get method do

Back 3

it only looks up the state of an object and reports on it

Front 4

What does the set and add method do

Back 4

modify the state of an object

Front 5

What are methods that change instance fields called

Back 5

mutator methods

Front 6

What are methods that only access instance fields called

Back 6

accessor methods

Front 7

What is a class

Back 7

A template or blueprint from which objects are made

Front 8

What are you doing when you construct an object from a class

Back 8

You have created an Instance of the class

Front 9

What is encapsulation

Back 9

Information hiding the implementation details from the user of an object

Front 10

What is Inheritance

Back 10

When you extend an existing class that has all the properties of an existing class and adds more to it

Front 11

What is the data in an object called?

Back 11

Instance Fields

Front 12

What are the procedures that operate on data called

Back 12

Methods

Front 13

What is the best standards for a class in terms of what comes first and second

Back 13

Methods come first
and then fields

Front 14

What does Public mean

Back 14

It means its available to any other code in the program

Front 15

What does the word Void mean

Back 15

Indicates the method will not return a value

Front 16

When do you use Static

Back 16

When you want to keep track of some information shared by all the members of a class OR When it doesn't make sense to have more than one instance of a property or method

Front 17

What is an expression

Back 17

A piece of code that evaluates to a single value like 2 + 2

Front 18

What is a statement

Back 18

a full sentence that end with a semi colon like a = 3

Front 19

How is encapsulation attained

Back 19

In the spirit of encapsulation it is common to make fields private. This means that they can only be directly accessed from the Bicycle class. We still need access to these values however. This can be done indirectly by adding public methods that obtain the field values for us

Front 20

What do Methods do

Back 20

They operate on objects and access their Instance Fields

Front 21

A method has two parameters and in dave.raisesalary(5) what are they called and which is which

Back 21

dave is the Implicit Parameter and the number inside the parentheses is the Explicit Parameter

Front 22

In every method what does the key word THIS imply

Back 22

That the word that follows is an implicit Parameter

Front 23

Does this have an Implicit Parameter Math.pow(x comma a)

Back 23

No because it does not use a math object to carry out its task

Front 24

What is Implicit in this X.F(param)

Back 24

X is implicit and Param is Explicit

Front 25

What is Java EE and what does it stand for

Back 25

Enterprise Edition it is designed to run on servers and it is scalable to multiple Server Applications

Front 26

API

Back 26

application program interface is a set of routines protocols and tools for building software applications. A good API makes it easier to develop a program by providing all the building blocks. A programmer then puts the blocks together.

Front 27

Servlet

Back 27

A small program that runs on a server.

Front 28

JVM

Back 28

Java Virtual Machine

Front 29

What is Java sensitive about

Back 29

Case Sensitive

Front 30

What is Public Private called

Back 30

Access Modifier they control the level of access other parts of the program have to the code

Front 31

In terms of Java, what should the key word CLASS remind you of with this language?

Back 31

everything in Java lives in a class

Front 32

How should you think of a Class

Back 32

as a container for the program logic that defines the behavior of the application

Front 33

What follows the Class keyword

Back 33

The name of the class

Front 34

What must Class names start with and what can they be named

Back 34

The must begin with an uppercase letter after that they can be letters of numbers and the length is almost unlimited

Front 35

What are the standard naming conventions in a class

Back 35

Class names are nouns that start with upper case letters if its multiple words use camelback

Front 36

What names must match when it comes to Classes

Back 36

The main Class and the name of the file must be the same

Front 37

What happens when you compile a file

Back 37

You end up with a file containing bytecodes for this Class

Front 38

What code does the compiler always start with

Back 38

the code in the main Method

Front 39

What is another term for Method

Back 39

function a methods performs some sort of function

Front 40

What method must you have in your source file for your class to run

Back 40

main method

Front 41

Do you declare the main method public, private, protected?

Back 41

Public

Front 42

What do braces generally denote

Back 42

parts usually blocks of code

Front 43

What ends each Java statement

Back 43

a semi colon and statements can span multiple lines

Front 44

How should you think of Java statements

Back 44

Sentences that end with a semi colon

Front 45

When calling methods what is the typical syntax

Back 45

object.method(parameters) like

Front 46

What else are Parameters called

Back 46

arguments

Front 47

What is the minimum and maximum number of parameters

Back 47

zero to infinity

Front 48

If there are no parameters in a methods when must the method still have

Back 48

empty parenthesis

Front 49

Three ways of marking comments

Back 49

// test here

Front 50

What are the comment notation for automatic documentation

Back 50

/** this will be automatically documents */

Front 51

What is it called when every variable must declare type

Back 51

Strongly Typed Language

Front 52

What is Java Congruency

Back 52

The programs must run with the sames results on all machines

Front 53

What does the name Double type come from

Back 53

Refers to the fact that it has twice the precision of float type

Front 54

What do numbers of float type as a suffix on a number

Back 54

an F like 3.402F with out the F they are always considered type Double

Front 55

What are the three special floating-point values that denote overflows and errors

Back 55

Positive infinity

Front 56

What is the method to check for NaN

Back 56

Not a Number

Front 57

How do you do quotes included in the sentence

Back 57

\" Like System.out.println("\"We will test this page test new line\"");

Front 58

What does every variable have and what order

Back 58

a type first then the name Like double salary int vacationDays

Front 59

What can you name a variable

Back 59

The first letter is a Letter and then letter and or numbers

Front 60

Can you have multiple variable declarations of the same page

Back 60

Yes but it is not recommended because of readability

Front 61

Are variable names case sensitive

Back 61

Yes you can had Variable and variable and the compiler thinks they are different variables

Front 62

What do some programs give to variable names

Back 62

Sometimes the name of the type. Like Box box

Front 63

What do some programmers name their variables with another letter

Back 63

Box aBox with aBox being the variable and Box the type

Front 64

What must you do after declaring a variable

Back 64

You must initialize it by means of an assignment statement

Front 65

When declaring variable what is considered good practice

Back 65

declare them as closely as possible to the point where they are going to first be used

Front 66

With variable what is the key word Final denote

Back 66

a constant which means you assign the variable once and then it is set once and for all

Front 67

With variable constants what is it good practice to structure the name

Back 67

ALL CAPS

Front 68

What is the shortcut to X = X + 4

Back 68

X +=4

Front 69

What does Java is portability

Back 69

A computation should yield the same results no matter which virtual machine executes it

Front 70

What is the keyword to exercise strict floating-point

Back 70

strictfp like

Front 71

How do you increment or decrement a variable

Back 71

n++ or n-- by one number

Front 72

What operator do we use to test for equality

Back 72

== Like

Front 73

What operator do we use to test for inequality

Back 73

!= Like

Front 74

How do you short circuit an expression being evaluated if the firsrt one doesn't evaluate

Back 74

expression1 && expression2 If the exp1 is shown to be false then exp2 is also false thus exp2 isn't evaluated Like x !=0 && 1/X. This will not allow a division be zero

Front 75

expression1 || expression2

Back 75

Condition first and if its true then exp1 is true if its not true then then exp2 is true Like x < y || X : Y

Front 76

Which class contains mathematical function and constants

Back 76

Math Class Like math.sqrt(x)

Front 77

There is a subtle difference between println and the math class what is it

Back 77

Println operates on an object the Math class does not and that is called static method

Front 78

What is HTTP name

Back 78

Hyper Text Transfer Protocol how to transfer data across the internet

Front 79

Which directory does static web pages reside?

Back 79

webdev folder

Front 80

EJBs what are they

Back 80

Enterprise Java Beans they represent verbs in the system like computeTax

Front 81

Session Beans come in how many states and what are they

Back 81

Stateless and Stateful

Front 82

Annotations

Back 82

User to specify additional information about a Class or Interface LIKE they can be used to specify if the session is stateless or stateful they always start with @ sign

Front 83

GUI

Back 83

A graphical user interface (GUI) is a human-computer interface (i.e. a way for humans to interact with computers) that uses windows icons and menus and which can be manipulated by a mouse (and often to a limited extent by a keyboard as well).

Front 84

JNDI

Back 84

Java Naming Directory Interface

Front 85

What does void represent

Back 85

The method does not return a value

Front 86

What else is a method called when you are not being lazy

Back 86

Method Declaration

Front 87

What is the called that is used to call a Method Declaration?

Back 87

Method Call e.g. fixthealternator(oldFord)

Front 88

What is the first part of a method called the public fixcar {

Back 88

Method Header

Front 89

What is the method called after the curly braces of a method

Back 89

Method body

Front 90

What is the MAIN method, and what other method can call it?

Back 90

They are recipes and the first method called into action when the program begins running. The main is never called by another method

Front 91

What is a STATEMENT?

Back 91

It is a sentence that tell the computer to do something like system.out.println

Front 92

The API is just a bunch of what?

Back 92

Code and the code perform actions for us that we can piece together to create a program

Front 93

Never lose sight that Java Code is just what?

Back 93

First and foremost an outline

Front 94

What does this represent <% Java Code %>

Back 94

JSP Code Snippet used to embed java code as opposed to declarations where you can embed methods

Front 95

What does this represent <%! JAva Code %>

Back 95

JSP declarations, they are used for Class level variable and methods that can be used throughout the page

Front 96

What does this represent <%= Java %>

Back 96

JSP Expressions like 5 * 2

Front 97

What is the purpose of the Request object?

Back 97

It represent the data submitted by the browser

Front 98

What is the purpose of the Response object?

Back 98

It represents the response that we are sending back to the client

Front 99

What is the purpose of the Out object?

Back 99

Represents output stream for the page, the content that will be sent back to the browser as the body of its response

Front 100

What is a Javabean?

Back 100

It's a Java class that conforms to a specific implementation pattern

Front 101

What is the thing called that is stored in a variable?

Back 101

a Value

Front 102

AmountInAccount = 50.22 what is this statement called?

Back 102

Assignment Statement

Front 103

What is JSP

Back 103

Java Server Page

Front 104

What is MVC

Back 104

Model - View - Controller

Front 105

What allows a Servlet or JSP to execute another Servlet and/or JSP within the context of the same http request?

Back 105

Request Dispatching. Java Object called RequestDispatcher

Front 106

The instance fields hold values of an object the set of those values is what?

Back 106

Their current state of that object and when you invoke a method on that object the state me be changed also

Front 107

What is the key to making encapsulation work?

Back 107

Have methods that never have direct access to the objects instance fields

Front 108

What is the "cosmic superclass from which all others derive?

Back 108

Object Class

Front 109

When you are looking for what should be a class what is a simple rule of thumb?

Back 109

Look for Nouns in the problem analysis, like Item, Order, Shipping Address, Payment, etc

Front 110

When looking for what should be a method what is a good rule of thumb?

Back 110

They are Verbs Like Add item to order, Cancel payment, Change shipping address

Front 111

What , it called when a developer realizes that a method should never have been created in the first place?

Back 111

Deprecated, and it is a good idea to stay away from deprecated methods, since there are better ones to replace them with

Front 112

What is the deployment descriptor for the appilcation

Back 112

the Web.xml file

Front 113

What is the difference = or ==

Back 113

= is an assignment to a variable and == is an equality check

Front 114

Two type of data types?

Back 114

Primitives and References

Front 115

What are the primitive?

Back 115

byte short int long float double char boolean

Front 116

What are the References?

Back 116

Arrays Classes and Interfaces

Front 117

What is the difference between these two
age = 16
newAge = ++age
newAge = age++

Back 117

the first one is still 17 because the pre-Increment increase the number before assigning. The second one assigns age to newAge first and then increments it

Front 118

What is the & sign

Back 118

And

Front 119

What is the | sign

Back 119

Or

Front 120

What is the ^ sign

Back 120

Exclusive or

Front 121

What is the ~ sign

Back 121

Compliment

Front 122

What is the ! symbol

Back 122

Not

Front 123

What is the && symbol

Back 123

Short Circuit AND
If age<21 && hasId --java will not check the second condition if the first is not met

Front 124

What is the || symbol

Back 124

Short Circuit OR
AcceptsCreditCards || HaveCash, if the first condition is true it will not check the second condition

Front 125

What are the two conversions and what does it mean

Back 125

Implicit and Explicit
Implicit means the compiler will convert them automatically, explicit means you have to use the cast method

Front 126

How do you cast

Back 126

with parenthesis like
like (double) 5. now the number is double or 5.0

Front 127

What is the "\n" + "text" symbol

Back 127

new line

Front 128

What is the "\t" + "text" symbol

Back 128

tab the text

Front 129

How do you say 20 % 3 or i % 3

Back 129

20 mod 3 or i mod 3

Front 130

What is this and what does it do: max = (a > b) ? a : b; or
System.out.println("The larger number is: " + (first > second ? first:second));

Back 130

The Ternary Operator. It's an operator, It simply checks the condition in the first section and then default to whichever one is true. It is handy because so many variable are checking one against the other

Front 131

What are Strings

Back 131

They are reference types not primitives. String is a class therefore it is capitalized

Front 132

What are reference types

Back 132

Means they point to a location in memory. Java hides the pointers while some programs allow you to get the memory address

Front 133

When comparing two strings like
"jave" "java" what should you not use

Back 133

Do not use the == because it java checks the memory location not the actual string. Sometimes the compiler will store the same string in different memory locations. Remember strings point to memory locations. Use the stringbuilder method eqauls

Front 134

What comparing two strings what method should you use

Back 134

"string".equals("string") instead of the == symbol. Remember strings are references to memory only. and the same string may be in different memory locations depending on the compiler

Front 135

Would this be true or false
"Java".equals("java")

Back 135

false, they are not equal because java strings are case sensitive and each of there references will be stored in different memories

Front 136

With strings like "Java".equals("java") what method can you use that makes this equal regardless of case

Back 136

equalsingnorecase, like
"Java".equalsignorecase("java")
would make these equal

Front 137

What are items within an array called

Back 137

Elements

Front 138

In Arrays can there be mixed types or do all the types need to be the same?

Back 138

All the types are the same

Front 139

How are arrays referenced or referred to?

Back 139

via an index and it starts at zero

Front 140

There are three ways to declare an array?

Back 140

int[] intArray;
String stringArray[];
object[] objectArray;

Front 141

When adding class constructors what is a good practice

Back 141

Start with a default constructor. public cat(){YOU CAN ADD ALL OF YOUR DEFAULT VALUES HERE }

Front 142

What are objects made from

Back 142

The Class. the blueprint.

Front 143

What defines an objects characteristics

Back 143

The Class. The bueprint

Front 144

What is an Entity?

Back 144

It is an object -- the house, and the house was built from the Class--the blueprint

Front 145

Can you have two methods with the same name

Back 145

Yes but the parameter requirements must be different

Front 146

Can we have two constructors in a Class

Back 146

Yes like a default constructor which contains the fields defaulted

Front 147

What is it called when you can have more than one method with the same name BUT different parameters

Back 147

Method Overloading

Front 148

Can you call the same method with different parameters (method overload) from the other method with the same name?

Back 148

Yes e.g. you can can call eat() from eat(String food) method

Front 149

Static means what

Back 149

General to the class and not specific to an object or instance. Like certain plants that are toxic to all cats

Front 150

What does final mean

Back 150

It's a constant

Front 151

What is an overloading constructor?

Back 151

It's a Class that has more than one constructor, of course of the same name because all constructors have the name of the class

Front 152

When is this used This();

Back 152

When you are in a overloaded constructor and you want to call the default constructor

Front 153

Cat c2 = new Cat() -- what is the c2 called?

Back 153

Instance Variable Name

Front 154

What is any part of Java that has a value

Back 154

An Expression

Front 155

What is the thing stored in a variable called

Back 155

A Value

Front 156

What are these called +=5 or ++ or -- or *=2, etc

Back 156

Assignment operators

Front 157

Anything that is not a primitive type is what?

Back 157

A reference type