Applet

Small java program that execute on web browserApplet program placed in html File Applet is class available in java.applet packageIt contain three interfaces: AppletContext, AudioClip

and AppletStubTypes: Local Applet: Create in local computer and use in web

pagesRemote Applet: Download from other Computer or

internet and use in web pages

Applet VS Application

Life cycle (methods)

Diagram

Already default implementation provide ed by Applet class

Compile and Execute

Compile:javac programname.java

Execution:

appletviewer programname.java

Note: applet program can add in html File and execute on web browser

Display message on applet

drawString method used

It is method of graphics class and use in paint method

Syntax: drawString (String message, int x, int y)

Message: a string that to display x: Horizontal starting position y: Vertical Starting position

Sample program to display hello word

import java.applet.*; // Packagepublic class Abc extends Applet{Public void paint (Graphics g){g.drawString( “Hello”, 100,100);}}/* <applet> // Html code <applet code=“ Abc” height=200 width=200></applet>*/

Methods of applet class resize ()

It use to resize size of appletviewer

Syntax: resize( int width, int height ) e.g. resize ( 500, 600)

Methods of applet class setBackground ()

It use to set background color of appletviewer

Syntax: setBackground( Color. colorname) e.g. setBackground( Color. red)

Methods of applet class setForeground ()

It use to set Foreground color of appletviewer

Syntax: setForeground( Color. colorname) e.g. setForeground( Color. red)

Methods of applet class showStatus ()

It use to set status of status bar of appletviewer

Syntax: showStatus( String message) e.g. showStatus( “ Welcome”)

Methods of applet class getCodeBase ()

It use to get path of Program where it stored without program name

Syntax: getCodeBase( ) e.g. URL u= getCodeBase( ) u= C:\Program Files (x86)\Java\jdk1.7.0\bin

Methods of applet class getDocumentBase ()

It use to get path of Program where it stored along with program name.

Syntax: getDocumentBase( ) e.g. URL u= getDocumentBase( ) u= C:\Program Files (x86)\Java\jdk1.7.0\bin\ac.java

Applet in html Applet tags: code: Program name width: width of page Height: height of page align: alignment hspace: horizontalspace vspace: verticalspace codebase: path of program

Param tag It use to accept input from userIt has two attributes: name and value and both are in

string format

User can access value of parameter using getParameter method

Syntax: String variablename= getParameter(String parametername)

e.g. <param name=“font” value=“10”> String f= getParameter(“font”) f= 10

Font It is a class available in java.awt package syntax: Font objectname= new Font (String fontname, int fontstyle, int fontsize)

Fontstyle:0- Plain OR Font.PLAIN1- Bold OR Font.BOLD2- Italic OR Font.ITALIC3- Bold+italic OR Font.BOLD+Font.ITALIC e. gFont f1 = new Font (“Arial”,2,24)

Set and Get Font setFont(): method of graphics class Syntax: Graphicsclassobject. setFont(FontObject) e.g g.setFont(f)

getFont():It gives information of the font which currently set

Syntax: Graphicsclassobject. getFont()o/p: jawa.awt.Font(name=arial style=bold size=12)

Methods of font class getName(): it retunes name of font in string. getStyle(): it returns style of font in int getSize(): it returns size of font in int isPlain(): It returns Boolean value which check

whatever style of font is plain or not isBold(): It returns Boolean value which check

whatever style of font is Bold or not isItalic(): It returns Boolean value which check

whatever style of font is Italic or not

Color It is a class available in java.awt package syntax: Color objectname= new Color (int red, int green, int blue) Value of red, green and blue in between 0-255 e.gColor c1 = new Color (120,130,55)

Set and Get Color setColor(): method of graphics class Syntax: Graphicsclassobject. setColor(ColorObject) e.g g.setColor(c1)

getColor():It gives information of the Color which currently set

Syntax: Graphicsclassobject. getColor()o/p: jawa.awt.Color (red= 120, green=130, blue=55)

Methods of Color class getRed(): it retunes value of red Color in

integer. getGreen(): it retunes value of Green Color in

integer.

getBlue(): it retunes value of Blue Color in integer.

Methods of Graphics class drawLine (): it use to draw line on applet.

Syntax: drawLine ( int x1,int y1, int x2,int y2)

(x1,y1): first end of Line (x2,y2): Second end of line

E.g drawLine (120,200,50,70)

Methods of Graphics class drawRect (): it use to draw rectangle on applet.

Syntax: drawRect( int x1,int y1, int width, int height)

(x1,y1): starting point of rectangle Width: width of rectangle Height: height of rectangle

E.g drawRect (120,200,50,70)

Methods of Graphics class drawRoundRect (): it use to draw rectangle on applet.

Syntax: drawRoundRect( int x1,int y1, int width, int height, int x diameter, int y diameter)

(x1,y1): starting point of rectangle Width: width of rectangle Height: height of rectangle

E.g drawRoundRect (120,200,50,70,20,30)

Methods of Graphics class drawOval (): it use to draw oval on applet.

Syntax: drawOval( int x1,int y1, int width, int height)

(x1,y1): starting point of rectangle Width: width of rectangle Height: height of rectangle

E.g drawOval (120,200,50,70)

Methods of Graphics class drawArc (): it use to draw arc on applet.

Syntax: drawArc( int x1,int y1, int width, int height, int startangle, int sweep angle)

(x1,y1): starting point of rectangle Width: width of rectangle Height: height of rectangle Sweep angle: +ve: anticlockwise -ve: clockwise E.g drawArc (120,200,50,70,45,45)

Methods of Graphics class

drawPolygon (): it use to draw polygon on applet.

Syntax: drawPolygon( int x[ ], int y[ ], int nop)

X[ ]: array of integer Y[ ]: array of integer Nop: number of points

Using graphics class

Drawing line graph

Drawing bar chart

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