introto javatechnology

7/25/2019 IntroTo JavaTechnology

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Discuss a "rief history of Java Dene Java

Di#erentiate Java Platforms

J$%% J$&%

J$M%

Descri"e the Java Virtual Machine (JVM )

%'plain the contents of the JavaDevelopment Kit (JDK)

Descri"e "enets an features of Java

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n **+, &un Microsystems "e-an an internal pro.ect /no0n as

the Green Projectto 0or/ on a ne0 technolo-y1n **$, the 2reen Pro.ect 0as spun o# an its interest irecte

to0ar "uilin- hi-hly interactive evices for the ca"le 3Vinustry1 3his faile to materiali4e1

n **5, the focus of the ori-inal team 0as re6tar-ete, this time

to the use of nternet technolo-y1 7 small 0e" "ro0ser calleHotJava0as 0ritten1 8a/ 0as rename toJavaafter learnin-that 8a/ ha alreay "een traemar/e1

n **9, Java 0as rst pu"licly release1

n **:, Java Development Kit (JDK) 1+ 0as release1

n $++$, JDK 15 (coename Merlin) 0as release, the most0iely use version1

n $++5, JDK 91+ (coename Tiger) 0as release, the latestversion1

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James 2oslin-is -enerally creiteas the inventor of the Javapro-rammin- lan-ua-e

He 0as the rst esi-ner of Java animplemente its ori-inal compileran virtual machine

He is also /no0n as the !ather ofJava

He is currently the ;hief 3echnical8


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519 million Java evelopers, the lar-est community of soft0are

evelopers =9> of professional evelopers in the 0orl use Java "illion evices run in Java

@$9 million Java6ena"le smart cars

9=* million Java6ena"le mo"ile evices

:9 Java6ena"le phone moels

=++ million es/tops 0ith Java soft0are $$+,+++ o0nloas of JDK 1 in .ust 0ee/s, $ million after a year $ million o0nloas for J$%% &DK Java8ne ra0s $+,+++ "ecomin- the 0orlAs lar-est eveloper

conference 8ver 5++ Java user -roups esta"lishe 0orl0ie Java runs on consumer an em"ee evices more than any other

soft0are 3he soft0are that po0ers the Mars over

6Java is Everywhere!


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7 multi6platform, net0or/6centric, o".ect6oriente pro-rammin- lan-ua-e

Multi6platform

t can run on almost any computer platform Cet0or/6centric

Desi-ne for "uilin- applications for the nternet

8".ect6oriente

t incorporates o".ect6oriente pro-rammin- moel

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A Java Platform is the set of APIs, class libraries, and other programs sed

in developing Java programs for specific applications

!here are 3 Java Platform "ditions

#$ Java 2 Platform, %tandard "dition &J2%"'( )ore Java Platform targeting applications rnning on *or+stations

2$ Java 2 Platform, "nterprise "dition &J2""'( )omponentbased approach to developing distribted, mltitier

enterprise applications

3$ Java 2 Platform, -icro "dition &J2-"'( !argeted at small, standalone or connectable consmer and

embedded devices


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Java /evelopment 0it &J/0'( Is a set of Java tools for developing Java programs( )onsists of Java API, Java )ompiler, and J1-

Java Application Programming Interface &API'( Is pre*ritten code, organied into pac+ages of similar topics

Java Virtual MachineJava APIMyProgram.java

Hardware - ased Platorm

J"#

J$E

Java 1irtal

-achine &J1-'(Is an

eection engine that

rns compiled Java

bte code


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7 Java pro-ram is 0ritten

3he pro-ram is compile

7 class fleis proucecontainin- bytecodes

3he "ytecoes areinterprete "y the JVM

3he JVM translates"ytecoes into nativemachine coe

#

)ompiler

Java 1irtal -achine

ative -achine )ode

pblic classelloorld 9

pblic static voidmain&%tring args: ;' 9

%stem$ot$println&'?

@

@

%orce )ode

)lass ile

Btecodes


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classelloorld 9

pblic static voidmain&%tring args: ;' 9

%stem$ot$println&'?

@

@Java Program

%om&iler

Hello

World!

'olaris

Inter&reter

Hello

World!

(in)*

Inter&reter

Hello

World!

Mac+'

Inter&reter


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Write 8nce, un 7ny0here Java is porta"le an platform inepenent

Cet0or/6centric ;an 0or/ 0ith resources across a net0or/ an multi6tier

architectures 8".ect6oriente

7 Java pro-ram moels a set of o".ects interactin- 0ith eachother o"ust

&tron- type chec/in- %'ception hanlin- mechanism 7utomatic memory mana-ement

Multithreae 7 Java application can run several i#erent processes callethreasE simultaneously

&ecurity ;an o0nloa remote coe over a net0or/ an run it in a

secure environment &ecurity levels an restrictions are hi-hly con-ura"le

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Java is multi6platform, net0or/6centric,o".ect6oriente pro-rammin- lan-ua-e1

James 2oslin- is the inventor of Java1 3here are three platforms of JavaF J$&%,

J$%%, J$M%1 JDK is a set of tools for evelopin- Java

applications1

JVM interprets Java pro-rams an allo0sthem to run on any platform1

Java is porta"le, ro"ust, multithreae,an secure1

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