Java Programming for absolute beginners
Tale of Cotets
Itroductio
ava is a cross-platfor, high-level laguage that was developed y Su icrosystes uder the leadership of aes goslig. The first versio of this
Laguage was released i 1995 i the for of ava 1.0 [2se]. Sice the, ava has coe a log way ad we are presetly workig o ava 8. esides this, several versios of ava like 2e (ava for oile applicatios) ad 2ee (ava for eterprise applicatios) have also released. ava was released as ope source software uder gu gpl y Su i 2006. The process of this trasforatio was copleted i 2007.
This ook is a egiers course o ava fudaetals. Therefore, it has ee created keepig i id that the reader has little to kow ackgroud kowledge aout ava. however, a little ackgroud of prograig laguages shall e helpful for etter uderstadig. Through this course, we hope to istill the asics of prograig i the reader fro the perspective ad with special focus o ava.
efore you egi, it is good for you to uderstad that prograig cocepts are geeric ad apply well to a rage of prograig laguages. Therefore, if you work towards uildig prograig cocepts istead of learig sytax, you will e ale to lear ay prograig laguages with iial effort. Focus o the cocept istead of the sytax!
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Chapter 1: gettig Started With ava
efore we ove o to ava prograig, let us give you a rief ackgroud of ava, the prograig laguage, ad the prerequisites of learig this prograig laguage. Oe of the ost iportat features of this prograig laguage is that it is cross-platfor. This is evidet fro the fact that ava was first advertised with the taglie Write oce, Ru Aywhere. So, all you eed to do is write a code, copile it ad the you ca ru it o ay syste, e it Widows, Uix, Liux or acitosh.
esides the aove-etioed, other features of ava iclude
Platfor idepedet
Oect orieted
Siple
Secure
Portale
Architecture-idepedet
Iterpreted
Roust
distriuted
ultithreaded
dyaic
high Perforace
Requireets to get Started
I order to get started with ava prograig, you eed to first have a workig coputer with Liux or Widows or acitosh. O this syste, you are goig to use two tools for ava prograig. The first of these tools is a text editor. If you are workig o Widows, you ca use otepad.
For other operatig systes, you ca try textedit or VI or whichever text editor is locally availale. The secod requireet for ava prograig is ava 8. You will eed to istall ava 8 o your syste. If you do ot wish to
Work o a local eviroet setup, you ca also try oe of the olie optios availale to copile ad ru your ava progras.
gettig a Local Setup Ready
Assuig that you have the syste ready ad you already have a text editor istalled o the syste, we are directly upig to the istallatio of ava o the syste. To start with, you will eed to dowload ava. ava SE is the free versio that you ca dowload usig the lik that google Search for the sae provides. e sure to dowload the versio that is developed for your operatig syste.
Oce the dowload is coplete, you will have a executale, which you are required to ru for istallatio. Upo copletio of istallatio, you will get a essage statig the sae. however, you are ot doe yet. ava will ot work util you set eviroet variales. You ca set the eviroet variales o your syste usig the followig istructios
Widows
I all proaility, the ava versio that you istalled y clickig o the .exe file that cae alog with the istallatio package ust have istalled i the directory: c:\Progra Files\ava\dk. Assuig this, you ust eed to ope properties y right clickig o y coputer. I the dialog ox that appears, ope Advaced ad go to Eviroet variales. Apped the existig cotets of the field y , c:\Progra Files\ava\dk\i.
Liux/freesd/Uix/Solaris
As a rule, the path of the eviroet variale is the path at which the iaries of the ava istallatio are placed. You ca look for these iaries o your syste to get the actual path ad the edit the .ashrc file. After you ope this file usig ay text editor, you eed to add the stateet:
Export path = /path/to/ava:$path
While the stadard way to ru ava progras is to create .ava files i otepad or ay text editor for that atter ad the execute the file usig coad-lie coads. however, over all these years, several ides have also coe ito existet to ake this task hassle-free for the prograer. eteas ad Eclipse are two such popular ides. You ca read aout the olie to see if they iterest you.
Chapter 2: Writig Your First ava Progra
ava ipleets oect-orieted prograig priciples. Therefore, a ava progra is a class file that upo executio creates a set of oects. These oects couicate with each other y eas of ethods. Soe of the ters that you will cooly ecouter i the ava teriology have ee explaied elow
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