Þ¶
õ¬ó java
-õ¤ù¢ Ü®ð¢ð¬ì ¹«ó£è¤ó£ñ¤é¢ º¬øè¬÷ ñ좴«ñ Üø¤ï¢¶
Þ¼è¢è¤ù¢«ø£ñ¢.
àí¢¬ñò¤ô¢ java
-õ¤¬ùð¢ ðòù¢ð´î¢î¤ Applets âù¢ø¬öè¢èð
¢ðìè¢Ã®ò
web
page -è÷¤ô¢ ðòù¢ð´ñ¢ ¹«ó£è¤ó£ñ¢è¬÷»ñ¢ ñø¢Áñ¢ Application
âù¢ø¬öè¢èð¢
ðìè¢Ã®ò Graphical
user interface (GUI) ¹«ó£è¤ó£ñ¢è¬÷»ñ¢
â¿î¤è¢
ªè£÷¢÷ô£ñ¢. Þ¬õ window operating System î¢î¤ô¢ Þò颰è¤ù¢øù.
Applets âùð¢ð´ð¬õ
º¿è¢è º¿è¢è web browser -è÷¤ô¢ Þò颰ñ¢.
âï¢î
å¼ °ø¤ð¢ð¤ì¢ì «õ¬ôò¤¬ùê¢ ªêò¢õîø¢°ñ¢ ïñ¢ñ£ô¢ Applet õ¬è
¹«ó£è¤ó£ñ¢è¬÷
â¿î¤è¢ ªè£÷¢÷ Þò½ñ¢. Þõ¢õ£Á à¼õ£è¢èð¢ð´ñ¢ Applet -
è¬÷ Hyper Text Markup
Language (HTML) âù¢ø¬öè¢èð¢ð´ñ¢ internet -®ô¢
ðòù¢ð´ñ¢
ªñ£ö¤ò¤ù¢ Íôñ¢ Þòè¢è «õí¢´ñ¢.
Internet Explorer ñø¢Áñ¢ Netscape Navigator ºîô£ù¬õ ðóõô£è
ðòù¢ð´î¢îð¢ð´ñ¢
Web
Browser-è÷¢ Ý°ñ¢. Þõø¢ø¤ô¢ î£ù¢ ï£ñ¢ Web siteè
¬÷ð¢
ð£ó¢è¢è¤ù¢«ø£ñ¢. Þï¢î web Browser-è÷¢ Java õ¤ô¢ â¿îð¢ð´ñ¢ Applet
è¬÷
¹ó¤ï¢¶ Þò袰ñ¢ î¤øù¢ ð¬ìî¢î¬õò£è Þ¼è¢è¤ù¢øù.
ï£ñ¢ Applet ¹«ó£è¤ó£ñ¢è¬÷ â¿î¤ º®î¢î ð¤ø° Browser è÷¤ô¢
ªêù¢Á
Check ªêò¢¶
ð£ó¢è¢è «õí¢´ñ¢ âù¢ð¶ Þô¢¬ô. ñ£ø£è Applet -è¬÷ Check
ªêò¢¶
ð£ó¢ð¢ðîø¢è¢ªèù¢«ø appletviewer âù¢ø tool åù¢Á JDK õ¤ô¢ Þ¼è¢è¤ù¢ø¶.
Þî¬ùð¢
ðòù¢ð´î¢î¤ ïñ¢ñ£ô¢ Applet è÷¢ êó¤ò£è Þò颰è¤ù¢øî£
âù¢ðî¬ù
êó¤ð£ó¢î¢¶è¢
ªè£÷¢÷ Þò½ñ¢.
ºîô¢ Applet ¹«ó£è¤ó£ñ¢
Listing
3.1
import java.applet.*;
import java.awt.Graphics;
public class helloapplet extends java.applet.Applet
{
public void init()
{
resize(200,150);
}
public void paint(Graphics g)
{
g.drawString(“Hello World!”, 50,50);
}
}
«ñ«ô
ªè£´è¢èð¢ð좴÷¢÷ ¹«ó£è¤ó£ñ¤¬ù Üð¢ð®«ò å¼ editor -ô¢
Type ªêò¢¶
ªè£÷¢Àé¢è÷¢. file-ä save ªêò¢»ñ¢ ªð£¿¶ ñøè¢è£ñô¢
HelloApplet.java âù¢ø ªðòó¤ô¢ ð ªêò¢»éè÷¢. ãªùù¤ô¢ ï£ñ¢
â¿î¤ò¤¼è¢è¤ù¢ø
class Ýù¶ public class Ýè Þ¼è¢è¤ù¢ø¶. ï£ñ¢ Java
¹«óè¤ó£ñ¤ù¤ô¢
public
class åù¢ø¤¬ù ⿶«õ£«ñò£ù£ô¢ Üï¢î file ô¤ø¢°
ªðòó¤´ñ¢
ªð£¿¶ Üï¢î class -ù¢ ªðòó¤¬ù«ò ªè£´è¢è
«õí¢´ñ¢ âù¢ðî¬ù
郎ùõ¤ô¢
ªè£÷¢Àé¢è÷¢.
import java.applet.*;
âù¢Á
ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Þ颰 applet âù¢ø Package -
ä
ï£ñ¢ import
ªêò¢î¤¼è¢è¤ù¢«ø£ñ¢. Þï¢î Package-ô¢ î£ù¢ applet ¹«ó£è¤ó£ñ¢è¬÷
⿶õîø¢°î¢
«î¬õò£ù class
-è÷¢ Þ¼è¢è¤ù¢øù. «ñ½ñ¢
public class
HelloworldApplet extends java.applet.Applet
âù¢Á
ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Üî£õ¶ HelloworldApplet âù¢Á
ï£ñ¢
⿶è¤ù¢ø ¹î¤ò class -ø¢è¢° java.applet.Applet âù¢Á ãø¢è¢ªèù«õ
Þ¼è¢è¤ù¢ø
å¼ class
-àìù¢ extends èì¢ì¬÷ò¤¬ùð¢ ðòù¢ð´î¢î¤ inheritance
ªêò¢òð¢
ð좮¼è¢è¤ù¢ø¶. ï¦é¢è÷¢ âð¢ªð£¿¶ Applet õ¬èò¤¬ùê¢ ê£ó¢ï¢î
¹«ó£è¤ó£ñ¢è¬÷
â¿î «õí¢®ò¤¼ï¢î£½ñ¢ Üð¢ªð£¿¶ªîô¢ô£ñ¢ «ñø¢è¢èí¢ì
º¬øò¤¬ù
èì¢ì£òñ£è ð¤ù¢ðø¢ø¤ò£è «õí¢´ñ¢.
ãªùù¤ô¢
java.applet.Applet
âù¢ø class Ýù¶ º¿è¢è º¿è¢è Applet -
è¬÷
à¼õ£è¢è¤ è좴ð¢ð´î¢î¤è¢ îò ܬù ¹«ó£è¤ó£ñ¢è¬÷»ñ¢
îù¢ùèî
ªè£í¢ì å¼ class
ݶñ¢. ï£ñ¢ ⿶è¤ù¢ø Class -ø¢è¢° Þï¢î
class àìù¢ inheritance ªêò¢»ñ¢ ªð£¿¶ ïñ¢º¬ìò class Ýù¶ å¼ Applet
Class Ýè
ñ£ø¤õ¤´è¤ù¢ø¶. ð¤ù¢ùó¢ ïñè¢°î¢ «î¬õò£ù ¹«ó£è¤ó£ñ¢è¬÷
ñ좴ñ¢
Þï¢î class
ù¢ à÷¢ â¿î¤è¢ ªè£í¢ì£ô¢ «ð£¶ñ£ù¶.
public void init( )
{
...
}
âù¢Á
å¼ function
Þ¼ð¢ðî¬ùè¢ èõù¤»é¢è÷¢. Þï¢î function ù¤¬ù Þîø¢°
ºù¢
ï¦é¢è÷¢ ðòù¢ð´î¢î¤ò¤¼è¢è ñ£ì¢¯ó¢è÷¢. âð¢ªð£¿ªîô¢ô£ñ¢ ï¦é¢è÷¢ Applet
⿶è¤ù¢ø¦ó¢è«÷£
Üð¢ªð£¿ªîô¢ô£ñ¢ Þï¢î init( ) function -ù¤¬ù â¿î¤ò£è
«õí¢´ñ¢.
ãªùù¤ô¢ Applet
¹«ó£è¤ó£ñ¢è÷¢ init( ) function -ô¢ ޼ î£ù¢
Þòé¢è
Ýóñ¢ð¤è¢è¤ù¢øù.
ï£ñ¢
ê£î£óíñ£è ⿶ñ¢ main ( ) function Ýù¶ Applet ¹«ó£è¤ó£ñ¢è÷¤ô¢
Þòé¢è£¶.
âù«õ main(
) function â¿îð¢ðì¢ì£ô¢ ܶ Java Application Ýè¾ñ¢,
init( ) function â¿îð¢ðì¢ì£ô¢ Üî¬ù Java Applet Ýè¾ñ¢ ï¦é¢è÷¢ ªè£÷¢÷
«õí¢´ñ¢.
init(
) function -ù¤ù¢ à÷¢ âù¢ù «õí¢´ñ£ù£½ñ¢ â¿î¤è¢
ªè£÷¢÷ô£ñ¢
âù¢ðî¬ù»ñ¢ Üî¤ô¤¼ï¢¶ î£ù¢ Appletè÷¢ Þòé¢è
Ýóñ¢ð¤è¢è¤ù¢øù
âù¢ðî¬ù»ñ¢ 郎ùõ¤ô¢ ªè£÷¢Àé¢è÷¢.
public void paint(Graphics g)
{
...
}
Þï¢î function Ýù¶ init ( ) function Þòé¢è¤ò ð¤ø° Ü´î¢î£è
Þò颰ñ¢. ñø¢Áñ¢
âð¢ªð£¿ªîô¢ô£ñ¢
Applet
޼袰ñ¢ Window -õ¤ô¢ ñ£ø¢Áñ¢
ï¤èö¢è¤ù¢ø«î£
Üî£õ¶
minimize,
maximize ºîô¤òù ïì袰ñ¢ ªð£¿¶ñ¢ Þï¢î paint function
Ýù¶
î£ù£è Þò颰è¤ù¢ø¶. ï¦é¢è÷¢ internet explorer -ô¢ Üî£õ¶ Browserô¢
Next ñø¢Áñ¢
Back ºîô¤ò Button -è¬÷ Ü¿î¢î¤ ºù¢«ù ޼袰ñ¢
Page -
è÷¢
ªêù¢Áõ¤ì¢´ ñ¢¹ñ¢ ªð£¿¶ paint function Þ¼ð¢ð¤ù¢ ܶ î£ù£è
Þò颰ñ¢.
Þï¢î paint( ) function -ô¢ Graphics âù¢ªø£¼ Class -ù¢ Object Ýù¶
Parameter Ýè âð¢ªð£¿¶ñ¢ Þ¼è¢è¤ù¢ø¶. Þî¬ù ðòù¢ð´î¢î¤ Line, Rectangle,
Circle, Text ºîô¤ò Graphics êñ¢ðï¢îð¢ðì¢ì¬õè¬÷
õ¬ó ªè£÷¢÷ º®»ñ¢.
import java.awt.Graphics;
âù¢Á
ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. awt âù¢ð¶ abstract windowing
toolkit âù¢ðîù¢
²¼è¢èñ¢ Ý°ñ¢. Þï¢î awt Package -ù¢ à÷¢÷¤¼è¢°ñ¢ ðô «õÁ
class è¬÷è¢
ªè£í¢´î£ù¢ Graphical User Interface (GUI) ¹«ó£è¤ó£ñ¢è¬÷
â¿î
Þò½ñ¢.
Üî£õ¶ Label,
Textbox, Combobox, Radio Button, Checkbox, Frame , Menu
ºîô£ù
ܬù windows
êñ¢ðï¢îð¢ðì¢ì ¹«ó£è¤ó£ñ¤é¢°è¬÷»ñ¢ awt Package
-ô¢ à÷¢÷ class è÷¤¬ùè¢ ªè£í¢«ì à¼õ£è¢è Þò½ñ¢. Þï¢î𢹫ó£è¤ó£ñ¤ô¢
ï£ñ¢ awt Package -ô¢ Þ¼è¢è¤ù¢ø Graphics âù¢Âñ¢ Package ¬ù ñ좴«ñ
import ªêò¢î¤¼è¢è¤ù¢«ø£ñ¢.init( ) function -ù¤ô¢ resize (200, 150); âù¢ø function
àð«ò£è¤è¢èð¢ð좮¼ð¢ð¬îè¢
èõù¤»é¢è÷¢. Þ¶ Applet -ô¢ Size Ýù¶ 200
ñø¢Áñ¢
150
Pixels âù¢ø Ü÷¾è÷¤ô¢ õó«õí¢´ñ¢ âùê¢ ªê£ô¢õîø¢°ð¢
ðòù¢ð´è¤ù¢ø¶.
«ñ½ñ¢ paint(
) function -ù¤ô¢
gdrawString(‘Hello World!‘, 50,10);
âù¢Á
ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Þ颰 g âù¢ð¶ Graphics âù¢ø
Class -ù¢ Object Ý°ñ¢. drawString Ýù¶ Graphics class -ù¢ Member function
Ýùî£ô¢
Üî¬ù Þ颰 ðòù¢ð´î¢î¤è¢ ªè£÷¢÷ º®è¤ù¢ø¶. Þîù¢ Íôñ¢
ïñ袰
«õí¢®ò text
-è¬÷ °ø¤ð¢ð¤ì¢ì row ñø¢Áñ¢ Column è÷¤ô¢ Üî£õ¶
Pixel- è÷¤ô¢
޼ display
ªêò¢¶ ªè£÷¢÷ º®»ñ¢.
Þð¢ªð£¿¶
ï£ñ¢ ïñ¶ ºîô¢ Java Applet -®¬ù â¿î¤ º®î¢î¤¼è¢
è¤ù¢«ø£ñ¢.
Þù¤ Þî¬ù âõ¢õ£Á Þòè¢è «õí¢´ñ¢ âù¢ðî¬ùè¢ è£í¢«ð£ñ¢.
ê£î£óíñ£è
java ¹«ó£è¤ó£ñ¢è¬÷ âõ¢õ£Á Compile ªêò¢«õ£«ñ£ Ü«î«ð£ô¢
Þï¢î
¹«ó£è¤ó£ñ¤¬ù»ñ¢ 覫ö ªè£´è¢èð¢ð좴÷¢÷¶ «ð£ô¢ compile ªêò¢¶è¢
ªè£÷¢Àé¢è÷¢.
javac
HelloworldApplet.java
¹«ó£è¤ó£ñ£ù¶
êó¤ò£è ޼袰ñ¢ ðì¢êî¢î¤ô¢ HelloworldApplet.Class âù¢ø file
åù¢Á
à¼õ£è¢è¤ò¤¼è¢°ñ.¢ Þð¢ªð£¿¶ ï£ñ¢ HelloworldApplet.class âù¢Âñ¢
Applet- ®¬ù
Þò袰õîø¢è£è èì¢ì£òñ£è å¼ HTML file -ô¤¬ù
à¼õ£è¢è¤ò£è
«õí¢´ñ¢. Java
Source code -®¬ù âï¢î Editor -ô¢ Type
ªêò¢î¦ó¢è«÷£
Ü«î editor
-ô¢ 覫ö ªè£´è¢ð¢ð좴÷¢÷ õó¤è¬÷𢠹î¤î£è
Type ªêò¢¶
ªè£÷¢Àé¢è÷¢.
<applet code="helloapplet.class" width=200
height=150>
</applet>
«ñ«ô
ªè£´è¢èð¢ð좴÷¢÷õ£Á Type ªêò¢¶ º®î¢î¾ìù¢ plain ascii text
formatô¢
Üî£õ¶
ê£î£óí text
file õ®õî¢î¤ô¢ myapplet.htm âù¢ø ªðòó¤¬ùè¢
ªè£´î¢¶
Save ªêò¢¶ ªè£÷¢Àé¢è÷¢. filename «õÁ ãî£õî£è Ãì ªè£´î¢¶è¢
ªè£÷¢÷ô£ñ¢.
Ýù£ô¢ extension
Ýù¶ .htm Üô¢ô¶ .html âù¢Á ªè£´è¢èð¢ðì
«õí¢´ñ¢.
àé¢èÀ袰
HTML ªîó¤ï¢î¤¼è¢°ñ¢ âù¢Á 郎ùè¢è¤ù¢«øù¢. Þô¢¬ô âù¢ø£½ñ¢
ðóõ£ò¤ô¢¬ô.
Þï¢î HTML
ªñ£ö¤ò¤ô¢ åõ¢ªõ£¼ °ø¤ð¢ð¤ì¢ì «õ¬ôèò¤¬ù»ñ¢
ªêò¢õîø¢è¢ªèù¢Á
îù¤ò£è tag
âù¢ø¬öè¢èð¢ð´ñ¢ èì¢ì¬÷è÷¢ Þ¼è¢è¤ù¢øù. Þõø¢ø¤ô¢
Applet -è¬÷ Browser -ô¢ Þò袰õîø¢° ðòù¢ð´ñ¢ èì¢ì¬÷ò£è <applet code...> âù¢Âñ¢
tag èì¢ì¬÷ð¢
ðòù¢ð´è¤ù¢ø¶. Þï¢î èì¢ì¬÷ò¤ô¢ Helloworld.Class âù¢Á ï£ñ¢ à¼õ£è¢è¤ò
Java Class file ªè£´è¢èð¢ð좮¼ð¢ð¬îè¢ èõù¤»é¢è÷¢. Height ñø¢Áñ¢
Width âù¢Á
ªè£´è¢èð¢ð좴
Üõø¢ø¤øø° ñî¤ð¢¹è¬÷ ªè£´è¢èð¢ð좮¼ð¢ð¬î»ñ¢ èõù¤»é¢è÷¢.
Þõø¢ø¤è¢°
ñî¤ð¢¹è¬÷ èì¢ì£òñ£è ªè£´è¢è «õí¢´ñ¢. ãªùù¤ô¢ Þ¬õ«ò Applet
-ù¢ ï¦÷, Üèôé¢è¬÷ º®¾
ªêò¢è¤ù¢øù. ï¦é¢è÷¢ Applet ¹«ó£è¤ó£ñ¢è¬÷ Java -õ¤ô¢
à¼õ£è¢è¤ù£ô¢
Üõø¢¬ø Þò袰õîø¢° èì¢ì£òñ£è HTML file -è¬÷ à¼õ£è¢è¤
Üõø¢ø¤ô¢
<applet code=‘HelloworldApplet.calss’
width=200 Height=150>
</applet>
âù¢ø
õ¬èò¤ô¢ èì¢ì¬÷è¬÷ â¿î «õí¢´ñ¢. Þù¤ Applet -è¬÷ âõ¢õ£Á
Þò袰õ¶
âù¢Á ð£ó¢ð¢«ð£ñ¢. Java Developement Kit (JDK) -ô¢ Applet Viewer
â¿î¤ò
tool Þ¼è¢è¤ù¢ø¶. Þî¬ùð¢ ðòù¢ð´î¢î¤ ï£ñ¢ â¿î¤ò Applet -è÷¢
êó¤ò£è
Þò颰è¤ù¢øî£ âù¢ðî¬ùê¢ êó¤ð£ó¢î¢¶è¢ ªè£÷¢÷ô£ñ¢. 覫ö ªè£´è¢èð¢
ð좴÷¢÷¶
«ð£ô¢ ªè£´î¢¶ Applet Viewer -ø¤¬ù Þò袰é¢è÷¢.
C:\JDK1.2> appletviewer
myapplet.Htm
appletviewer -ø¤¬ùî¢ îõ¤ó¢î¢¶ ï£ñ¢ «ïó®ò£è«õ Browser -è÷¤½ñ¢ Applet -è¬÷
Þòè¢è¤è¢
ªè£÷¢÷ô£ñ¢. â´î¢¶è¢è£ì¢ì£è Internet Explorer âÂñ¢ Browser ø¤¬ù Windows
-ô¢ Open ªêò¢¶ ªè£÷¢Àé¢è÷¢.
Þï¢î Internet Exlorer
Browser Ýù¶ open Ýè¤ò¾ìù¢ Üî¤ô¢ Þ¼è¢è¤ù¢ø
Address
Line -ô¢
ïñ¢º¬ìò HTML
file âï¢î folder -ô¢ Þ¼è¢è¤ù¢ø«î£ Üî¬ùê¢
êó¤ò£è Ãø¤ file
-ù¢ ªðòó¤¬ùè¢
ªè£´î¢«î£«ñò£ù£ô¢ ïñ¢º¬ìò Applet Ýù¶ Browse -ô¢ Þò颰ñ¢. ºîô¢ Java Applet -®¬ù ªõø¢ø¤èóñ£è Þòè¢è¤
º®î¢¶
Þ¼è¢è¤ù¢«ø£ñ¢.
கருத்துகள் இல்லை:
கருத்துரையிடுக
குறிப்பு: இந்த வலைப்பதிவின் உறுப்பினர் மட்டுமே ஒரு கருத்துரையை வெளியிடக்கூடும்.