XJV1NS0627 InstructorPhilipM-1

Object

Application (Project)
Factory
PROVIDER (api/external)
Service (inject > Classes)
Class (export > import)  Contacts
 Object Contact   > Contacts.Contact
   data type (String) var (fname) arg > param
   data type (int)  var (age)  Contacts.Contact.age
     fname = "Philip"  > "Philip" value  value>arg
     age = 30  > 30 value

if    > values   if elif elif else
for   > type and var
do    > param and Objects
switch > param and Objects
try  > Class Objects

if else else if statement > conditions boolean

if (condition) { 
 encapsulate true;
 // 27 steps
 }
else if (condition) {
// true
}

else {
// false
}

switch statement > evaluate value expression
dayOfWeek = "A"
switch (expression) {
	case value1:
    		Monday
	case value2:
		Tuesday
	case 3:
		Wed
	default:
		"what you would think of else"
}

if else > statement 
switch case > statement
loops >
 for or do

for (init, condition, update) {
  return
 }

Belong to themselves "Return themself"
variable x (mutable / R/W) String x = "Philip"
immutable variable y (immutable / R)
 final int y = 10

variable Return class
static variables > return to class
  cartTotal = 210.36  > class > process cc

dec (init) something
declaration value
value returned

JavaCustom

Google Chrome
intellij download Free Community Version

myBasics.java

class myBasics {

  myBasics() {
	// constructor
     }

}


underscore_case  var
TitleCase Class Objects
UPPERCASE  PROVIDERS
lowercase 
camelCase function / methods


void > void the obj in memory null defined
any > returns BUT leaves obj in memory  !nulls
boolean > true false


myIfElse()  tuple(p1,p2)

I.C.C.C.O.O.O.m.m.m.m.m.prop.value.m()

int num = 10;

value.toString()
"10"


type var > Object   Class varName
data type  var > Property   int varName

ContactInfo Class  4 that you need
 fname   
 lname
 add
 city

ContactDetails
 age
 bday

ContactData
 CI
 CD

void any boolean  BUT general "return"

OOP Chapters 
Class MyBasics<F/S> Main
1. template > structure   MyBasicsS
2. blueprint > functional MyBasicsF

Class Objects > instance of the Class new
Object > attributes<structural> behaviors<method>

Base 5:
1. Data (Attribute)
2. Method / Methods (behaviors)
3. Object Creation
    ContactInfo  Objects
    ContactDetails Objects
4. Encapsulation { multiple exp }
5. Inheritance hierachies

Inner P > C

Day 2 > Inner Classes  8:30 CST
Tonight > Upload Java code

Be on at 8 CST
8 CST - 8:30 CST code debugging

Day 1 Code is located at:

https://onlclabs.com/java/

click on Java06272023

Be advised, if you naming scheme is different than mine, you need to update your code.

Inner Classes
class Super {
z
   class sub {  x y S.z } logically
}

Types of Inner Classes
1. Member Inner Class  S.z
2. Static Nested Class Not access S.Z
   inst = new Super
3. Local Inner Class
   mymethod() {
	 int v;
	lic name {  v }
               }
4. Anonymous Inner Class
    one time use
    "lambda expression"
    anony function

Recursive Methods "same type"
> Big Problem > divide it into smaller subproblems of the same type
> complex tasks break them down smaller tasks

Base Case: requirement, condition terminates and then does the return

Recursive Case: "method" steps same type returned to the base case

Method call: define chars of the method

control var = 1 <BC>
switch (exp):  <BC>
  case 1:   <RC>
    op1;  method1()  <method call>
    op2;
    op3;

  case 2 :
    method1()

base 5       5
recr1 4      5-1 4  9      n + sum(n-1)
recr2 3      4-1 3  12 
recr3 2      3-1 2  14 
recr4 1      2-1 1  15
recr5 0      1-1 0  "term not pos num" 
terminate back to base > result

sum(control) > 15

control  = 5

control - 1   

Override Methods
SuperClass   method1()
  SubClass   method1()

Inhert attributes BUT override value

@Override
method1()

class Person SuperClass
 school = "onlc"
 whoAmI() { S.o.p("person" + school) }
class Student extends Person
 whoAmI() { S.o.p("student" + school) }
class Instructor extends Person
 whoAmI() { S.o.p("instructor" + school) }

Class = new Class();   execute external class
Class { Class {} }  execute internal class
Class extend Class  override  methods in a class
Interface extends Class interface dependent class


person(fname, lname)

@Override
person(add, city, state , zip)

Interface
1. depends on another Class
2. declared interface InterfaceName
3. implicitly imply public or abstract
4. Poly > inherit the class depending on
5. constants > passed to class

immutable  R
mutable  R/W

Optional param
Override()
setting default

String fname
Optional<String> fname

Collections Set of classes (data sets) interfaces

List
ArrayList
LinkedList

Charaterists
1. indexed Array["bob","joe"]   0,1
2. sorted "Ohio","Florida" ?  "Florida","Ohio"
3. singular or key:value or attr:value
   fname: "Philip"  dict/map
4. duplicated "Bob","Joe,"Bob"
5. immutable vs mutable (a1, a2, a3) immutable
	methodName(p1,p2,p3)
6. Syntax
   [] > Array or ArrayList [ { } ]
   {} > List
   { k:v } or { a:v } > Dict or Maps
   () > tuples

1. ArrayList[] > ordered, indexed, dups, mutable
2. TreeSet{} or HashSet{} > unordered, !dup, mutable
3. Map{k:v} > key!dup: valuedup

String fname = "Philip"
String ClassType
fname varName

ArrayList String fname = "Philip"
ClassType ClassType varName = value
Class<Class>(value)
ArrayList<String> fname = new ArrayList<String>()

for (String ordersx : orders1)  {
	System.out.println(ordersx)
}

<String, Integer>
"Apples": 5
"Bananas": 2

Map<String, Integer> varName = new HashMap<>();

1. meta
2. property
3. members <

Properties (external file .properties)
attr=value

Regular Expressions  regex101.com

1. String Literal
String "Bob"  char[] ['B','o','b']
[a-z][A-Z][0-9]
2. Metachars
 `.` `*` `+` `?` `|`
3.Quantifies    10,10,10,8,10    10 as 4
`{n}` n=4 exact
`{n,}  n=4
`{n,m}`   n=4  m=8
4. Anchors
 ^ beginning of the line  ^[Phi]
 $ end of the line
 \b   word boundary   Philip Matusiak


^\w + @ [a-zA-Z_] + ?\.[a-zA-Z]{2,3}$

^begins with a-zA-Z0-9_		philipm
+
@				@
+
[a-z][A-Z_]			onlc
+
\.				.
[a-zA-Z] {2,3}			com
$end					


Wrap Up
Zip files:
C:\Users\Student\IdeaProjects\*yourfolder
gotomypc toolbar Tools>Transfer

site: onlclabs.com/java

Books chapter 1-8

philipm@onlc.com

onlc.com/eval

Certificate of Completion