Applet Program

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class textsum extends Applet implements ActionListener

{

TextField x,y,tot;

public void init()

{

Label xp=new Label(“X:”,Label.RIGHT);

Label yp=new Label(“Y:”,Label.RIGHT);

54

Label totp=new Label(“Total:”,Label.RIGHT);

x=new TextField(5);

y=new TextField(5);

tot=new TextField(10);

add(xp);

add(x);

add(yp);

add(y);

add(totp);

add(tot);

x.addActionListener(this);

y.addActionListener(this);

tot.addActionListener(this);

}

public void actionPerformed(ActionEvent ae)

{

int a,b,c;

a=Integer.parseInt(x.getText());

b=Integer.parseInt(y.getText());

c=a+b;

tot.setText(“” + c);

}

}

Þï¢î𢠹«ó£è¤ó£ñ¤ô¢ x, y, tot âù¢Á Íù¢Á TextField object -è¬÷ à¼õ£è¢è¤

Üõø¢Á÷¢x ñø¢Áñ¢ y Ýè¤ò Object -è÷¤ô¢ Type ªêò¢òð¢ð´ñ¢ ñî¤ð¢¹è¬÷ Ã좮

tot âù¢Âñ¢ Object -ù¢ à÷¢ «ð£´ñ£Á â¿î¤ò¤¼è¢è¤ù¢«ø£ñ¢.

ï£ñ¢ x ñø¢Áñ¢ y Ýè¤ò Object -è÷¤ô¢ ñî¤ð¢¹è¬÷ Type ªêò¢î ð¤ø° Enter Key

ò¤¬ù Ü¿î¢î¤ò¾ìù¢ ïñ袰 Calculation ïìè¢è «õí¢´ñ¢ Üô¢ôõ£? Üîø¢è¢è£è

ï£ñ¢ implements ActionListener âù¢Âñ¢ õ£è¢è¤òî¢î¤¬ù

class-¬ù ⿶ñ¢ Þìî¢î¤ù¤ô¢ Þ¬íî¢î¤¼è¢è¤ù¢«ø£ñ¢. Üî£õ¶

public class textsum extends Applet implements ActionListener

âù¢Á ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. ActionListener âù¢ð¶ å¼

Interface Ý°ñ¢. Þ¶ «ð£ù¢Á 郎øò Interface -è÷¢ Þ¼è¢è¤ù¢øù. ïñ袰

«õí¢®ò Interface-¬ùð¢ ðòù¢ð´î¢î¤è¢ ªè£÷¢÷ implements âù¢Âñ¢ èì¢ì¬÷

ðòù¢ð´è¤ù¢ø¶.

TextField x,y,tot; âù¢Á init( ) function-ø¢° «ñô¢ Global Ýè âù¢Á Íù¢Á

Object ´è¬÷ define ªêò¢¶ ¬õî¢î¤¼è¢è¤ù¢«ø£ñ¢. ãªùù¤ô¢ Þõ¢õ£Á Global

Ýè ⿶ñ¢ ªð£¿¶ textsum class -¬ìò ܬù method è÷¤½ñ¢

Üõø¢¬øð¢ ðòù¢ð´î¢î¤è¢ ªè£÷¢÷ô£ñ¢ âù¢ðî¬ù 郎ùõ¤ô¢ ªè£÷¢Àé¢è÷¢.

init( ) function -ù¤ô¢ xp, yb, totp âù¢ø ªðòó¢è÷¤ô¢ Íù¢Á Label Object -è÷¢

à¼õ£è¢èð¢ð좮¼è¢è¤ù¢øù. ܬõ Right align Ýõîø¢è¢è£è

Label.RIGHT âù¢Á ªè£´è¢èð¢ð좮¼è¢è¤ù¢ø¶.

x, y, tot Ýè¤ò object-è÷¢ new operator -ø¤¬ùð¢ ðòù¢ð´î¢î¤ à¼õ£è¢èð

¢ðì¢ìð¤ù¢ ܬõ add function Íôñ¢ õó¤¬êò£è Applet -®Â÷¢ add ªêò¢òð¢

ð좮¼è¢è¤ù¢øù. ï£ñ¢ Þï¢î ¹«ó£è¤ó£ñ¤ô¢ ºè¢è¤òñ£è èõù¤è¢è «õí¢®ò¶.

x.addActionListener(this);

y.addActionListener(this);

tot.addActionListener(this);

âù¢Âñ¢ õó¤è¬÷î¢î£ù¢. Üî£õ¶ Þï¢î addActionListener( ) âù¢Âñ¢ function

-ä ªè£´ð¢ðîù¢ Íôñ¢, âð¢ªð£¿¶ªîô¢ô£ñ¢ ï£ñ¢ Þï¢î Object ´è÷¤ô¢ Enter

Key ò¤¬ù ܿè¤ù¢«ø£«ñ£ Üð¢ªð£¿ªîô¢ô£ñ¢ actioPerformed âù¢Âñ¢

event Ýù¶ î£ù£è Þòé¢è¤õ¤´ñ¢.

Public void actionperformed(ActionEvent ae)

âù¢ø õ®õ¤ô¢ ޼袰ñ¢ Þï¢î Event Ýù¶ ActionListener âù¢Âñ¢ Interface

-¬ù Þï¢î ¹«ó£è¤ó£ñ¤ô¢ implement ªêò¢î¤¼ð¢ðîù£ô¢ î£ù¢

ðòù¢ð´î¢îð¢ð´è¤ù¢ø¶ âù¢ðî¬ù 郎ùõ¤ô¢ ªè£÷¢Àé¢è÷¢.

Þï¢î actionperformed( ) function -ô¢ ï£ñ¢ a, b, c âù¢Á Íù¢Á integer

variable-è¬÷ int data type -ù¤ô¢ à¼õ£è¢è¤ò¤¼è¢è¤ù¢«ø£ñ¢. Þï¢î variable è÷¤ô¢

ï£ñ¢ x, y TexField è÷¤ô¢ Type ªêò¢î ñî¤ð¢¹è¬÷ â´î¢¶ð¢ «ð£´è¤ù¢«ø£ñ¢.

a = Integer.ParseInt(x.getText ( ));

b = Integer.ParseInt(y.getText ( ));

âù¢Á ªè£´î¢î¤¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Þî¤ô¢ getText âù¢ð¶ TextField class

-ù¢ member function Ý°ñ¢. Þî¬ùð¢ ðòù¢ð´î¢¶ñ¢ ªð£¿¶ ï£ñ¢ âù¢ù

ñî¤ð¢¹è¬÷ TextField-è÷¤ù¢ à÷¢ Type ªêò¢î¤¼è¢è¤ù¢«ø£«ñ£ Üõø¢¬øð¢

ªðø¢Á袪è£÷¢÷ô£ñ¢.

Þï¢î º¬øò¤ô¢ ï£ñ¢ TextField -è÷¤ô¢ ޼袰ñ¢ ñî¤ð¢¹è¬÷ ªð¼ñ¢ªð£¿¶

ܬõ String data type Ýè ޼袰ñ¢. Þõø¢¬ø int data type Ýè ñ£ø¢ø¤ù£ô¢

î£ù¢ ïñ袰 Calculation è¬÷ê¢ ªêò¢ò º®»ñ£îô£ô¢ Integer.ParseInt âù¢Âñ¢

function ù¤¬ùð¢ ðòù¢ð´î¢î¤ò¤¼è¢è¤ù¢«ø£ñ¢. Þï¢î Integer.ParseInt function

Ýù¶ String õ®õ¤ô¢ ޼袰ñ¢ Number è¬÷ Integer data type Ýè ñ£ø¢ø¤è¢

ªè£´î¢¶õ¤´ñ¢.

ܴ c = a + b; âù¢Á ªè£´î¢î¤¼ð¢ðîù¢ Íôñ¢ x , y Object -®ô¢ à÷¢÷

ñî¤ð¢¹è¬÷ Ã좮 c âÂñ¢ variable-ô¢ «ð£ì¢´ õ¤ì¢«ì£ñ¢. Þð¢ªð£¿¶ Þï¢î c

ò¤ô¢ à÷¢÷ ñî¤ð¢ð¤¬ù tot âù¢Âñ¢ TextField -ù¢ à÷¢ «ð£ì «õí¢´ñ¢ Üô¢ôõ£?

Üîø¢° TextField class -ô¢ à÷¢÷ setText âù¢Âñ¢ function

ðòù¢ð´î¢îð¢ð´è¤ù¢ø¶.

tot.setText (“” + c);

âù¢Á ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. SetText function -ù¤ù¢ Íôñ¢

String data è¬÷ ñ좴«ñ â¿î º®»ñ£îô£ô¢ c ò¤ô¢ à÷¢÷ Integer

ñî¤ð¢¹è¬÷ type cast ªêò¢õîø¢è¢è£è “” + c âù¢Á String -°ìù¢ «êó¢î¢¶è¢

ªè£´î¢î¤¼è¢è¤ù¢«ø£ñ¢.

Þï¢î𢠹«ó£è¤ó£ñ¤¬ù compile ªêò¢¶ 覫ö ªè£´è¢èð¢ð좴÷¢÷õ£Á

à÷¢÷ õó¤è¬÷ð¢ ðòù¢ð´î¢î¤ HTML file åù¢ø¤¬ù à¼õ£è¢è¤ Üî¬ù Þòè¢è¤ð¢

ð£¼é¢è÷¢.

<applet code="textsum.class" width=500 height=400>

</applet>