ஜாவா புரோகரம் ~ ஷாஜஹான் சார்லஸ்-ன் தொழில்நுட்பம்

«õí¢´ñ¢ âù¢Á ¬õî¢¶è¢ ªè£÷¢Àé¢è÷¢. Üî¬ù OOP º¬øò¤ô¢ å¼ Class

Ýè â¿î «õí¢´ñ¢. class âù¢ð¶ variable -è¬÷»ñ¢, function -è¬÷»ñ¢

ªè£í¢ì ªî£°ð¢¹ Ý°ñ¢.

â´î¢¶è¢è£ì¢ì£è ¹î¢îèé¢è¬÷ð¢ ðø¢ø¤ò îèõô¢è¬÷ ¬èò£÷¢õîø¢è£è

å¼ ¹«ó£è¤ó£ñ¢ â¿¶è¤ù¢«ø£ñ¢ âù¢Á ¬õî¢¶è ªè£÷¢Àé¢è÷¢. Üîø¢ªèù¢Á

å¼ class â¿î «õí¢´ñ¢. Üï¢î class -ø¢è¢° ï£ñ¢ Book âù¢Á ªðòó¢

ªè£´è¢èô£ñ¢. Þï¢î Book âÂñ¢ class -Â÷¢ ï£ñ¢ ðî¤ï¢¶ ¬õî¢¶è¢ ªè£÷¢÷

«õí¢®ò îèõô¢èÀè¢è£è variable -è¬÷ à¼õ£è¢è «õí¢´ñ¢. BookName,

AuthorName, Publisher, Price ºîô¤ò îèõô¢è÷¢ Book Class -ø¢° «î¬õªòù¤ô¢

ï£ñ¢ variable -è¬÷ ÜîÂ÷¢ à¼õ£è¢èô£ñ¢. Þî¢î¬èò variable -è¬÷ data

members âù¢Á Ü¬öè¢è¤ù¢ø«ø£ñ¢.

Þõ¢õ£Á å¼ class -ù¢ à÷¢ à¼õ£è¢èð¢ðì¢ì data member è¬÷ê¢ ê£ó¢ï¢«î£

Üô¢ô¶ ê£óñ«ô£ ï£ñ¢ ðô function -è¬÷ class -è÷¤ù¢ à÷¢ â¿î¤è¢

ªè£÷¢÷ô£ñ¢. Þõ¢õ£Á class -ù¢ à÷¢ â¿îð¢ð´ñ¢ function -è¬÷ Method

âù¢Á Ü¬öè¢è¤ù¢«ø£ñ¢.

Ýè data members(variable) ñø¢Áñ¢ methods (function) Ýè¤òõø¢¬øè¢

class Ý°ñ¢.

àé¢èÀè¢° ‘C’ ªñ£ö¤ò¤ô¢ ¹«ó£è¤ó£ñ¢ â¿î ªîó¤ï¢î¤¼è¢°«ñò£ù£ô¢ Struct

âù¢ø¬öè¢èð¢ð´ñ¢ structure -è¬÷ð¢ ðòù¢ð´î¢î¤ò¤¼ð¢ð¦ó¢è÷¢. Üî¤ô¢ ï£ñ¢ ªõ¼ñ¢

variable -è¬÷ ñì¢´ñ¢ ªè£í¢´ å¼ structure -ø¤¬ù à¼õ£è¢è¤ îèõô¢è¬÷

ê¤øð¢ð£è ðòù¢ð´î¢¶è¤ù¢«ø£ñ¢. Üî¢î¬èò Structure -è÷¤ù¢ advanced version

Ýè«õ class -è÷¢ ðòù¢ð´è¤ù¢øù.

ïñ¢ñ£ô¢ Object -´è¬÷ à¼õ£è¢è¤è¢ ªè£÷¢÷ Þò½ñ¢. ²¼è¢èñ£è Ãø¤ù£ô¢

class Ýù¶ å¼ user defined data type Ýèð¢ðòù¢ð´è¤ù¢ø¶. Üî£õ¶ int,

char, float, double ºîô¤ò data type -è¬÷ð¢ ðòù¢ð´î¢î¤ âõ¢õ£Á ï£ñ¢ variable

-è¬÷ à¼õ£è¢è¤ ðòù¢ð´î¢¶è¤ù¢«ø£«ñ£ Ü¶ «ð£ô ï£ñ¢ â¿¶ñ¢ class -è÷¢

data type -è÷£è Þòé¢°è¤ù¢øù. Üõø¢¬øè¢ ªè£í¢´ ïñ¢ñ£ô¢ variable -è¬÷

à¼õ£è¢è¤è¢ ªè£÷¢÷ Þò½ñ¢. Üî¢î¬èò variable -è¬÷«ò ï£ñ¢ Object -

âù¢Á Ü¬öè¢è¤ù¢«ø£ñ¢. Þõ¢õ£Á class -è¬÷ à¼õ£è¢è¤ Üîù¢Íôñ¢ Object

-´è¬÷ à¼õ£è¢è¤ ðòù¢ð´î¢¶ñ¢ º¬øò¤¬ùî¢î£ù¢ Object-Oriented

Programming âù¢Á Ü¬öè¢è¤ù¢«ø£ñ¢.

Listing 2.1.

class book

{

String bookname;

String authorname;

String publisher;

int price;

public void store(String tbookname, String tauthorname,

String tpublisher, int tprice)

{

bookname=tbookname;

authorname=tauthorname;

publisher=tpublisher;

price=tprice;

}

public void display()

{

System.out.println(“Book Name : “ + bookname);

System.out.println(“Author Name : “ + authorname);

System.out.println(“Publisher : “ + publisher);

System.out.println(“Price : “ + price);

System.out.println(“—————————————————”);

}

public static void main(String arg[])

{

book java = new book();

book oracle = new book();

java.store(“Java Language”,”Packianathan”,

”AnuRagham”,250);

oracle.store(“Oracle Datbase”,”Packianathan”,

”AnuRagham”,125);

java.display();

oracle.display();

}

Þï¢îð¢ ¹«ó£è¤ó£ñ¤ô¢ Book âù¢ªø£¼ class â¿îð¢ðì¢®¼ð¢ð¬îè¢

èõù¤»é¢è÷¢. Þé¢° main( ) Function ù¤¬ùî¢ îõ¤ó¢î¢¶ Üîø¢° ºù¢ ðô õó¤è÷¢

Þ¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Üõø¢ø¤ô¢ ºîô¤ô¢ BookName, AuthorName, Publisher,

Price Ýè¤ò variable -è÷¢ à¼õ£è¢èð¢ðì¢®¼è¢è¤ù¢øù. Ü¬õ Þï¢îè¢ class-ù¢

data member -è÷¢. Üî¬ùî¢ ªî£ìó¢ï¢¶ Store ñø¢Áñ¢ display âù¢Á Þóí¢´

function -è÷¢ Þ¼è¢è¤ù¢øù. Þ¬õ Methods âù¢Á Ü¬öè¢èð¢ð´è¤ù¢øù.

Þõø¢ø¤ô¢ store function Ýù¶ parameter -è÷¤ù¢ õö¤ò£è ñî¤ð¢¹è¬÷ð¢ ªðø¢Á

Üõø¢¬ø data member -è÷¤ô¢ ðî¤ï¢¶ ¬õð¢ðîø¢°ð¢ ðòù¢ð´è¤ù¢ø¶. Ü¶«ð£ô¢

display function Ýù¶ data member -è÷¤ô¢ à÷¢÷ ñî¤ð¢¹è¬÷ Display ªêò¢¶ð¢

ð£ó¢ð¢ðîø¢°ð¢ ðòù¢ð´è¤ù¢ø¶.

Þï¢îð¢ ¹«ó£è¤ó£ñ¤¬ù Compile ªêò¢¶ Þòè¢°ñ¢ªð£¿¶ main( ) function

Book java = new Book ( ) ;

Book oracle = new Book ( ) ;

âù¢Á ªè£´è¢èð¢ðì¢®¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Þ¶«õ å¼ class -ô¤¼ï¢¶

Object-´è¬÷ à¼õ£è¢°ñ¢ º¬ø. ºîô¤ô¢ class -ù¢ ªðòó¤¬ùê¢ Ãø¤, ð¤ù¢ùó¢

à¼õ£è¢°è¤ù¢ø Object -®ù¢ ªðòó¤¬ùê¢ ªê£ô¢ô «õí¢´ñ¢. Þé¢° java ñø¢Áñ¢

oracle âù¢ðù Book Class -ô¤¼ï¢¶ à¼õ£è¢èð¢ð´ñ¢ Object -´è÷¢ Ý°ñ¢.

Ü´î¢¶ ï£ñ¢ = âÂñ¢ assignment operator -ø¤¬ùè¢ ªè£´î¢¶ Üî¬ùî¢ ªî£ìï¢¶

Java-4

new Book( ) âù¢Á ªè£´î¢î¤¼è¢è¤ù¢«ø£ñ¢. Þõ¢õ£Á ªè£´è¢°ñ¢ ªð£¿¶

î£ù¢ àí¢¬ñò¤ô¢ Class ù¢ Object -Ýù¶ ¹î¤î£è à¼õ£è¤ù¢ø¶.

Þõ¢õ£Á Object Ýù¶ à¼õ£°ñ¢ ªð£¿¶ Üï¢î Class -ù¢ à÷¢ ï£ñ¢

õ¬óò¼î¢î¤¼è¢è¤ù¢ø data member -èÀñ¢ ñø¢Áñ¢ method -èÀñ¢ Üï¢îï¢î Object-

´èÀè¢ªèù¢Á îù¤î¢îù¤ò£è à¼õ£è¤ù¢øù. Üî£õ¶ Þé¢° java âù¢ø

Object-ø¢è¢° âù¢Á îù¤ò£è Book Name, Author Name, Publisher, Price ºîô¤ò

Variable èÀñ¢ store( ) ñø¢Áñ¢ display( ) Ýè¤ò function -èÀñ¢ à¼õ£è¤ù¢øù.

Þ«î«ð£ù¢Á îù¤ò£è Oracle Object -ø¢è¢°ñ¢ à¼õ£°ñ¢.

Þ¶ «ð£ô¢ âî¢î¬ù Object ´è÷¢ à¼õ£è¢°è¤ù¢ø«ø£«ñ£ Üî¢î¬ùè¢°ñ¢

îù¤î¢îù¤ò£è datamember -è÷¢ ñø¢Áñ¢ method -è÷¢ Þ¼ð¢ðî£è ï¤¬ùõ¤ô¢

java.store(‘Java Language’,‘Packia Nathan’,‘Anuragham’, 150);

oracle.store(‘Oracle Database’,‘Packia Nathan’,’Anuragham’, 125) ;

âù¢Á Þ¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Üî£õ¶ java âù¢ø Object -®ô¢ à÷¢÷ store

function -ù¤¬ù»ñ¢ Ü¶«ð£ô oracle âù¢ø object -ô¢ à÷¢÷ store functionù¤

¬ù»ñ¢ ðòù¢ð´î¢î¤ Üï¢îï¢î Object -´è÷¤ô¢ à÷¢÷ data member -è÷¤ô¢

îèõô¢è¬÷ð¢ ðî¤ï¢¶ ªè£÷¢è¤ù¢«ø£ñ¢.

Þé¢° Object ªðòó¤ø¢è¢°ñ¢ function -ù¤ù¢ ªðòó¤ø¢è¢°ñ¢ ï´õ¤ô¢ å¼ ¹÷¢÷¤

Þ¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Üî£õ¶ Þï¢î Object -®ô¢ Þ¼è¢è¤ù¢ø function

âù¢Á °ø¤ð¢ðîø¢è¢è£è Þõ¢õ£Á ªè£´è¢èð¢ð´è¤ù¢ø¶. «ñ½ñ¢ Þ«î

º¬øò¤¬ùð¢ ðòù¢ð´î¢î¤

java.display( )

oracle.display( )

âù¢Á display function è¬÷ Þòè¢è¤ Üï¢îï¢î Object -´è÷¤ô¢ ðî¤ï¢¶ ¬õî¢¶

Þ¼è¢è¤ù¢ø ñî¤ð¢¹è¬÷ display ªêò¢¶ ð£ó¢î¢¶è¢ ªè£÷¢Àè¤ù¢«ø£ñ¢.

Listing 2.2

class emp

{

int empno,salary;

String ename,job;

public void assign(int tempno, String tename, String tjob,

int tsalary)

{

empno=tempno;

ename=tename;

job=tjob;

salary=tsalary;

}

public void view()

{

System.out.println(“Employee Number : “ + empno);

System.out.println(“Employee Name : “ + ename);

System.out.println(“Job : “ + job);

System.out.println(“Salary : “ + salary);

}

class tata

{

public static void main(String arg[])

{

emp nancy = new emp();

emp john = new emp();

nancy.assign(101,”Nancy Jenifer”,”Analyst”,6000);

john.assign(102,”John Thomas”,”Programmer”,6000);

nancy.view();

john.view();

}

Þï¢îð¢ ¹«ó£è¤ó£ñ¤ô¢ emp âù¢ø class åù¢Áñ¢ Tata âù¢ø class åù¢Áñ¢

â¿îð¢ðì¢®¼è¢è¤ù¢øù. Þï¢î Þóí¢´ class -ø¢è¢°ñ¢ Þ¬ìò¤ô¢ âï¢îªõ£¼

ªî£ìó¢¹ñ¢ Þô¢¬ô.

emp âÂñ¢ class -ô¢ å¼ èñ¢ªðù¤ò¤ô¢ «õ¬ôð¢ ð£ó¢è¢è¤ù¢ø ªî£ö¤ô£÷ó¢

è÷¤ù¢ îèõô¢è¬÷è¢ ¬èò£÷¢õîø¢°ø¤ò ¹«ó£è¤ó£ñ¤¬ù â¿î¤ò¤¼è¢è¤ù¢«ø£ñ¢.

Üî£õ¶ Þî¤ô¢ empno, ename, job, salary âù¢ø îèõô¢è¬÷ê¢ «êèó¤è¢°ñ¢

ªð£¼ì¢´ variable -è¬÷ à¼õ£è¢è¤, Üõø¢ø¤ô¢ ñî¤ð¢¹è¬÷ ðî¤õîø¢°ñ¢, ñø¢Áñ¢

Üõø¢ø¤ô¢ Þ¼è¢è¤ù¢ø ñî¤ð¢¹è¬÷ è£í¢ðîø¢è¢°ñ£è º¬ø«ò assign ñø¢Áñ¢

view Ýè¤ò function -è¬÷ â¿î¤ò¤¼è¢è¤ù¢«ø£ñ¢.

Tata âù¢ªø£¼ class Þ¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Þ¶ Tata âù¢Âñ¢

èñ¢ªðù¤ò¤ù¢ îèõô¢è¬÷ ðó£ñó¤è¢°ñ¢ class âù¢Á èø¢ð¬ù ªêò¢¶

ªè£÷¢Àé¢è÷¢. Þï¢î Class -ô¢ î£ù¢ main function Ýù¶ Þ¼è¢è¤ù¢ø¶

âù¢ðî¬ù»ñ¢ èõù¤»é¢è÷¢. Þï¢î ¹«óè¤ó£ññ¤¬ù ï¦é¢è÷¢ Compile ªêò¢¶

Run ªêò¢»ñ¢ ªð£¿¶ Tata èñ¢ªðù¤ò¤ô¢ à÷¢÷ main function î£ù¢ Þòé¢°ñ¢

âù¢ð¶ àé¢èÀè¢° ï¤¬ùõ¤¼è¢°ñ¢. Þï¢î main function -ô¢ ï£ñ¢ emp âù¢Âñ¢

class õ¤¬ùê¢ ê£ó¢ï¢î Þóí¢´ object -´è¬÷ à¼õ£è¢è¤ò¤¼è¢è¤ù¢«ø£ñ¢.

Üî£õ¶,

emp nancy = new emp( ) ;

emp john = new emp( ) ;

ºîô¤ò õó¤è¬÷ °ø¤ð¢ð¤´è¤ù¢«ø£ñ¢. ï£ñ¢ Þ¼ð¢ð«î£ Tata âù¢Âñ¢ Classø¢

è°÷¢ Üé¢è¤¼ï¢¶ «õªø£¼ class -Ýù emp -ò¤ù¢ Object -´è¬÷ Þé¢°

à¼õ£è¢è¤è¢ ªè£÷¢Àè¤ù¢«ø£ñ¢. ð¤ù¢ùó¢ nancy ñø¢Áñ¢ john Ýè¤ò Object-

´èÀè¢°ø¤ò assign ñø¢Áñ¢ view function -è¬÷ð¢ ðòù¢ð´î¢î¤è¢

ªè£÷¢Àè¤ù¢«ø£ñ¢.

Þõø¢ø¤ô¤¼ï¢¶ å¼ class â¿îð¢ðì¢´õ¤ì¢ì£ô¢ Üîù¢ Object -´è¬÷

«õÁ âï¢î class -ù¢ à÷¢ Þ¼ï¢¶ñ¢ ðòù¢ð´î¢î¤è¢ ªè£÷¢÷ô£ñ¢ âù¢ðî¬ù

ªî÷¤õ£è Üø¤ï¢¶ ªè£÷¢Àé¢è÷¢.

8/23/2013

ஜாவா புரோகரம்

கருத்துகள் இல்லை:

கருத்துரையிடுக

என்னைப் பற்றி

	Look inside >

Sept/Oct 2013


இங்கு டைப் செய்யவும்