25305511-Core-Java-Notes.doc

7/22/2019 25305511-Core-Java-Notes.doc

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14/6/2007

Java Technology

1. Java Standard Edition (Java SE)2. Java Enterprise Edition (Java EE)

. Java !o"ile Edition ( Java !E)

http#//$ava.s%n.co&

'ersions1. rod%ct 'ersion

a. 1.0

". 1.1

c. 1.2d. 1.

e. 1.4

. *.0

g. 6.02. +eveloper 'ersion (J+, - JE)

a. 1.0". 1.1

c. 1.2

d. 1.e. 1.4

. 1.*

g. 1.6

Tools

1. Java +evelop&ent ,it (1.* - 1.6)2. Java %nti&e Environ&ent (1.* - 1.6)

Editor or IDE

1. otepad

2. Kawa

. eteans

4. Eclipse

*. ntelliJ6. ! 'is%al ge

7. 3racle J+eveloper

Etc.

J+, Javac.ee5 J'.EE5 J.EE etc.

JE Java 'irt%al !achine 8ar"age 9ollector

J'!9ode 'eriier JT (J%st:n:Ti&e) co&piler

History of Java
http://java.sun.com/http://java.sun.com/


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+eveloped in 1;;1 at S%n !icrosyste&s "y Ja&es 8osling ?

rena&ed to Java in 1;;*.

Featres of Java

1. Si&ple

2. Sec%re. 3"$ect 3riented

4. orta"le

*. lator& ndependent

a. .$ava J'9.EE .class (yte 9ode)JT inary

". J'! is a &achine dependent progra& that &a>es Java lator&

ndependent6. o"%st

a. n:"%ilt

i. "ig set o li"rariesii. 8ar"age 9ollection

". Eception handling acility7. !%ltitheaded

16/6/2007

9o&&ents

1. !%ltiline co&&entsa. /@ A @/

2. Single Bine

a. // co&&ents. +oc%&entation 9o&&entsa. /@@ and @/

Types of Java !rogra"s

1. Java pplication

2. Java pplets

#riti$g Java %pplicatio$ !rogra"s

1. Each application progra& &%st have an entry point

p&lic static void "ai$'(tri$g args)*+

2. Java provides a set o li"raries called pac>ages containing a related set o classes

a. $ava.lang (dea%lt) C rovides all co&&only %sed classes li>e String5 !athetc.

". $ava.io C /3 related classes. Dile5 Dileriter5 Dileeader5 np%tStrea&5

np%tStrea&eader5 %eredeader etc.

c. $ava.sFl or J+9


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d. $ava.aey"oard and o%t or the &onitor. i$is an o"$ect o I$pt(trea"class and

otis an o"$ect o !ri$t(trea"class

rintStrea& class provides &ethods1. print()

2. println()

. print()

#riti$g first /ava progra"

// irst progra& C irst.$ava

class TestI

p%"lic static void &ain(String argsK)ISyste&.o%t.println(LMello to allL)H

N

N

ote# Set the path o older "eore co&pilation

SET TMOPTMPH+#QJ+,1.*Q

o"pili$g Java progra"sJ'9 Rprogra&na&e

e.g.

J'9 irst.$ava Test.class

File a"i$g co$ve$tio$

1. ile can have any n%&"er o classes and choice o its na&e ecept i class isp%"lic then "oth &%st "e sa&e


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2. progra& can have only one p%"lic class

$$i$g a class

J' Rclassna&e

Java Test

Data Types

1. ntegral types (ll are signed)

a. "yte : 1 "yte". short : 2 "ytes

c. int : 4 "ytes

d. long : "ytes

2. Dloatingsa. loat : 4 "ytes (6 dec. place)

". do%"le : "ytes (14 dec. place)

. 9haracters

a. char : 2 "ytes (Gnicode)4. ooleans

a. "oolean C 1 "it ( can have only tr%e or alse)

3aria&les

&e&ory location to store and retrieve the val%es that can "e changed any


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Dloating literals (dea%lt is do%"le)

do%"le >O*6.6H

loat pO4.*H // never get co&piledloat pO4.*DH // Gse or D s%i or loating

9haracter literals: Enclosed in single F%otes

char chO??H

: Escape seF%ence characters

o Qn

o Qt

o QQ

o QV

Eg.Me said5 WQnV is or ne< line

String Biterals: Enclosed in do%"le F%otes

: Mandled "y (tri$gclass o $ava.lang pac>age

String na&eOV'i>asVH

eadi$g Data fro" 5ey&oard

!ethod 1

1. Gse (ca$$erclass o/ava.tilpac>age

a. !ethods o Scanner class

i. int netnt()ii. do%"le net+o%"le()

iii. String net()

17/6/2007

!ethod 2 C Gsing %eredeader: ead data ro& >ey"oard (Syste&.in) and pass it to np%tStrea&eader

: np%tStrea&eader converts the "yte into character

: ass the characters to %eredeader to place the& into a "%er till enter >eyis pressed

: ass the "%ered data to any place %sing readBine() &ethod o%eredeader class

%eredeader "rOne< %eredeader(ne< np%tStrea&eader(Syste&.in))H

ote# readBine() ret%rns the data in String or&at. t need to "e converted to other types.

Java provides special >ind o classes or conversion called #rapper classes


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rapper class is a special class corresponding to data types

"yteyte class

shortShort class

intnteger class

long Bongchar 9haracter

o$versio$ rle

datatype varia"leO


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1. rith&etic : @ /

2. Bogical -- YY Z

. elational OO ZO O R RO instanceo 4. it


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Test.


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1. 8eneral class

2. Dinal class C fi$al>eyey "alance.

assign&ents]i&pecca"letrainers.co.in

2:-6-2008

!illars of !s

1. Encaps%lationa. ll &e&"ers &%st "e


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class 9 etends // s%per class5 5parent class

IN

: Java provides only single inheritance

: Each $ava class in a child class o 3"$ect class: Gse tis>eyage is a older contains classes and interaces or speciic p%rpose: +ierent pac>age can have classes ageso +#Q"1p>g

: 9reate a older to p%t yo%r classes called as pac>age

o +#Q"1p>gQ&atc1:

: 9reate the classes and save the& into "atch1 older age "atch1H

class TestI

N

g

: &port the pac>age and %se its classes

Distri&tio$ of !ac5ages

1. ac>ages can "e distri"%ted in t


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E.g. 9reating a J ile

J cv test.$ar @.gi @.$ava @.class

8oto the +3S pro&pt and then goto the older containing the pac>age

(d#Q"1p>g)

ss%e the co&&and to create a $arJ cv "1.$ar .

24/6/2007

I$trodctio$ to I$terfaces

: collection o a"stract &ethods and inal ields

: ll &ethods are p%"lic and a"stract "y dea%lt and each ield is p%"lic andinal "y dea%lt

: rovides a &ethod to i&ple&ent the &%ltiple inheritance in Java

: class can inherit any n%&"er o interace %sing i"ple"e$ts>eyeyey


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: Java provides ive >ey to al


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Syste&.o%t.println(s1OOs2)H//val%e co&parison : Tr%e

o String 3"$ects

String s1One< String(Wa>eshV)H

String s2One< String(Wa>eshV)H

Syste&.o%t.println(s1OOs2)H//eerence co&parison C Dalse

: !ethods o String classo toGpper9ase()

o toBo


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o void set'isi"le("oolean ")

o void setac>gro%nd(9olor c)

: o$tai$erclass provides co&&on &ethods or all the containers

o void setBayo%t(Bayo%t!anager l&)

o void add(9o&ponent c)

o void re&ove(9o&ponent c):

Types of ,age

Dra&e class

: rovides top level container or applications: !ethods

o void setTitle(String s)

,e$eral ,


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: !ethods

o void setTet(String tet)

o String getTet()

%tton class

: To create a p%sh "%tton

: 9onstr%ctor o %tton(String la"el)

: !ethod

o void setBa"el(String la"el)

o String getBa"el()

o void addctionBistener(o"$ect)

2/6/2007

Bayo%t!anagers

: Special classes that control the place&ent o co&ponents in a container: ll are inherited ro& Bayo%t!anager class

: They are

o orderBayo%t

+ea%lt or Dra&e

+ivides the screen into * sections

East

est

orth

So%th

9enter

+ea%lt is center

+eine the section


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: Gse seto%nds() &ethod o setBocation() and setSiUe() &ethods

seto%nds(int 5 int y5 int eyressed(,eyEvent e)

p%"lic void >eyeleased(,eyEvent e)

Gse &ethods o ,eyEvent

o 3"$ect getSo%rce()

o char get,ey9har()


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o void cons%&e()

I$trodctio$ to %dapters

: Special classes corresponding to listeners


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R/ME+

R3+^

R/3+^R/MT!B

TagX Tag is special code enclosed in R and deined "y 9. e.g RMT!BR/MT!B5

RM1R/M15 R!8 etc.

Types o TagsX

1. aired Tags

a. Maving opening and closing "oth

i. Rh1R/h15 R"R/"5 RiR/i etc.2. Sing%lar Tags

a. Maving only opening section

i. R 5 R!8 5 R!ET5 R8S3G+ etc.

%ttri&tes: roperties


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a&eOVpara&eter na&eV

'al%eOVpara&eter val%eV

. pplets do not contain any &ain() &ethod or the constr%ctor4. ll applets &%st "e p%"lic

*. Each $ava progra& to "e called as an applet &%st inherit ro& %ppletclass o

/ava.appletpac>agea. pplet class provides vario%s &ethods

>etods of %pplet class

: p%"lic void init() C si&ilar to constr%ctor5 eec%tes only or once

: p%"lic void paint(8raphics g)

: p%"lic void repaint()

>etods of ,rapics class

: 8raphics is a class ro& $ava.aage to dra< strings5 i&ages5 shapes etc.

o p%"lic void dra


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&age i&gOget&age(GB path5 String ilena&e)

:-8-2008

e$s

1. +rop +oe$=ar class o"$ecti. 9reate >e$class o"$ects

1. 9reate >e$Ite"class o"$ects

". Set the !en%ar on ra&e %sing set!en%ar() &ethod o Dra&e classc. lace the ctionBistener on !en%te&

2. op%p!en%s

:9reate an o"$ect o !opp>e$ class and add !en% or !en%te& or "oth: To sho< the pop%p&en% %se !o%seBistener?s &o%seealeased() &ethod

: 9hec> the right clic> %sing is!oppTrigger'+&ethod o !o%seEvent class

: Gse sho


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9reating Bisto

: llo"o()

o 9hec>"o(String caption)

o 9hec>o(String caption5 "oolean chec>ed)

: Gse &oolea$ get(tate'+&ethod to chec> the state

9reating radio "%ttons

: Gse the sa&e ec5&o;class "o8ro%p and then the 9hec>"o

o 9hec>"o(String caption5 9hec>"o8ro%p cg5 "oolean state)

: Gse getState() to chec> the state

C-8-2008

J+9 (Java +ata"ase 9onnectivity)

: Java is a ront end that can "e connected ind o data"ase: ll classes and interaces are provides in tages

o $ava.sFlo $ava.sFl

(teps to se te JD=

1. 9hec> or the data"asea. !S ccess

". !y SFl

c. 3racle2. 9hec> or the driver class ile

a. S%n provides a dea%lt driver called J+9:3+9 ridge


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4. Esta"lish the connection


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o void setnt(int indeno5 int val%e)

o void setString(int indeno5 String val%e)

: lloa$agi$g Tra$sactio$s

: 9onnection interace provides three &ethods

o set%to9o&&it("oolean state) :: dea%lt is tr%e

o co&&it() C hen all codes eec%ted

o roll"ac>() C hen so&e eception occ%rs

8-8-2008

oadi$g Drivers si$g (yste" !roperties

Syste&.setroperty(W$d"c.driversV5VdriverclassV)H

(tori$g i$for"atio$ a&ot driverB rlB logi$ a$d password otside te progra"

: Store the inor&ation in a ile eyOval%e relationship


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//data"ase.properties

driverOs%n.$d"c.od"c.Jd"c3d"c+river%rlO$d"c#od"c#"1

loginO

passO

: ead the ile ro& dis> to &e&ory %sing FileI$pt(trea"class o $ava.io

pac>age

Dilenp%tStrea& One< Dilenp%tStrea&(Wdata"ase.propertiesV)H

: To separate the data or dierent properties5 %se !ropertiesclass o $ava.%tilpac>age


25/39

S

nsert into e&p val%es(]na&e5 ]e&ail)

83

on e< _%ery and rite yo%r proced%re: Select the roced%re and press D* to eec%te

: roced%re has "een created

alli$g a stored procedre

: 9reate a 9alla"leState&ent and %se eec%te() &ethod

9alla"leState&ent csOcn.prepare9all(LIcall Save+ata(X5X)NL)H

cs.setString(15na&e)Hcs.setString(25e&ail)H

cs.eec%te()H

10-8-2008

Sage %sed $ava.s


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o static String shos are set %sing a class called a$agerand applied %sing class

(wi$gndDeel() &ethod G!anager

o G!anager.setBoo>ndDeel(L$ava.sndD

eelL)H

o G!anager.setBoo>ndDeel(Lco&.s%n.$ava.sndDeelL)H

o G!anager.setBoo>ndDeel(Lco&.s%n.$ava.s


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: To create a slide to a select a val%e ro& &ini&%& to &ai&%&

: 9onstr%ctor

o JSlider(int direction5 int start5 int end5 int dea%ltval%e)

: Bistener %sed

o 9hangeBistener

p%"lic void state9hanged(9hangeEvent e): !ethdod

o void set!ini&%&(int val%e)

o int get!ini&%&()

o void set!ai&%&(int val%e)

o int get!ai&%&()

o void set'al%e(int n)

o int get'al%e()

o void setEtent(int val%e)

o void set!a$orTic>Spacing(int n)

o void set!inorTic>Spacing(int n)

o void setaintTic>s("oolean displaytic>s)

o void setaintBa"els("oolean displaytetla"els)

12-8-2008

JTetrea class

: Dor &%lti:line tet

: JTetrea(int roey)

To &a>e a hot >ey: 'irt%al >ey a constant given to so&e >ey inside the ,eyEvent class

o ,eyEvent.',`

o ,eyEvent.',`9,S9E

: To apply the shortc%t co&&and apply the Key(tro5eclass o"$ect to the

J!en%te& o"$ects %singo setccelarator(,eyStro>e >s) &ethod

: ,eyStro>e class provides static &ethod get,eyStro>e()

o Select the >ey and the !as> ,ey

!as> ,eys can "e lt5 Shit or 9trl provided in Event class

Event.9TB`!S,

Event.BT`!S,

Event.SMDT`!S,


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,eyStro>e >sO,eyStro>e.get,eyStro>e(,eyEvent.',`5Event.9TB`!S,)H

&n%es)H

JToolar class

: To create a tool"ar: 9ontains a collection o JToolar%tton class o"$ects

:

JnternalDra&e class: rovide a ra&e


29/39


30/39

String class provides getytes() &ethod

"yte K"Os.getytes()H

: hile reading read the data "yte "y "yte

et topic

!%ltithreading

17-8-2008

Thread is s%":process


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2. eady State

a. hen start() &ethod is called

. %nning Statea. Eec%tion o r%n()

4. loc> State

a. hen thread goes to Sleep5 ait or S%spend sit%ation*. +ead state

a. hen is inished to stop is called

(y$cro$iatio$

: hen teys

: t can "e %sed


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Gsing $oin() &ethod

: To hold the thread in &e&ory %ntil depending threads get ter&inated

T1.$oin()H// inished end

T2.$oin()H//inished second last

T.$oin()H //inished irst


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: ll classes are provided in/ava.$etpac>age

: eting can "e o tet

o G+

Server Side +atagra&Soc>et

9lient Side

+atagra&Soc>et

: Every server &%st >no< its port n%&"er and every client &%st >no< the

ddress or +S along


34/39

: rovides a &ethod accept()

Soc>et accept()H

Ea&ple

ServerSoc>et sOne< ServerSoc>et(0)H

Soc>et cOs.accept()H

lie$t (ide wit (oc5et

Soc>et sOne< Soc>et(WipaddressV50)H

Soc>et class provides &ethods

np%tStrea& getnp%tStrea&()H

3%p%tStrea& get3%tp%tStrea&()

To send data in string or&at5 create an o"$ect o rintriter class

rintriter o%tOne< rintriter(c.get3%p%tStrea&()5 tr%e)H

Gsing print()5 print()5 println() &ethod to send data.

To read data %se getnp%tStrea&() &ethod at the place o Syste&.in

%eredeader "rOne< %eredeader(ne< np%tStrea&eader(s.getnp%tStrea&())H

24-8-2008

or>ing et

+atagra&ac>et

netddress

netddress hold inor&ation a"o%t a &achine and provides special static &ethods that

ret%rn o"$ect o its o


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+atagra&ac>et("yte K"5 int siUe)

+atagra&ac>et("yte K"5 int siUe5 netddress ia5 int port)

"yte Kget+ata()

int getBength()

+atagra&Soc>et class

: %sed to send o receive the data

+atagra&Soc>et(int port)

!ethod

send(+atagra&ac>et p)receive(+atagra&ac>et p)

#e& etwor5i$g

: rovides co&&%nication ro& a &achine to ey5 3"$ect val%e)

3"$ect get(String >ey)

En%&erator >eys()

o En%&eration interace

"oolean has!oreEle&ents()

3"$ect netEle&ent()


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ote# %se instanceof operator to >no< the type o an ele&ent in collection

26-8-2008

#or5i$g wit ollectio$ Fra"ewor5

: set o interaces and classes that %nder so&e r%les called 9ollection

Dra&e: They designed o%r &ain interaces

o 9ollection interace

Top level interaces or all collections

o Bist : an interace to ey


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: Gse static>eyage

: Gse start() &ethod to start the process

2;/7/2007

ens: 9onstr%ctor

o StringTo>eniUer(String s5 String to>ens)

: !ethods

o "oolean has!oreTo>ens()

o String netTo>en()


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Ti"er &ased %pplicatio$s wit Ti"er a$d Ti"erTas5 class

: Ti&erTas> provides a r%n() to provide the ing: Ti&er class provides a sched%le() &ethod

o sched%le(Ti&erTas> t5 int delayti&ein&s5 int repeatti&ein&s)

o cancel()o restart()

e"ote >etod I$vocatio$ '>I+

: &ethod to place all the logic and data on centraliUed server and call the&

ro& any age

". ll &ethods &%st throage. 9reate a server progra& to reside on a &achine and server the clients

a. Gse a&ing.re"ind() to provide so&e server na&e and ret%rn the o"$ect o

"%siness logic class to the client

&. a"i$g.re&i$d'server$a"eB$ew &sclass$a"e'++4. 9reate a client progra& to contact the server and get reerence o "%siness logic

ile into an interace

a. Gse a&ing.loo>%p() &ethod connect


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*. 9reate STG and S,EBT3 or the "%siness &ethod to &arshalling and %n:

&arshaling the &ethods

a. Gse !9 tool ro& J+, to create the&i. !9 i&ple&entclass

". o< in J+, 1.* S,EBT3 is optional

c. STG is or client and S>elton is or Server

Files placed o$ clie$t

nterace

St%"

9lient rogra&

(erverside

nterace

Server rogra&&ple&entation progra&

E;ecti$g te applicatio$

Server Side

Start the !E8ST^

STT !E8ST^

Start the Server progra&9lient

Start the client progra&

ote# The c%rrent older &%st "e in classspath

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