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Java Applets
CS442- Advanced Programming using Java
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this.setSize(x, y);
set the applet size
this.setBackground(Color.red);
set the applet background color( Note that after
you write dot . You will find a list of available
colors)
g.setColor(Color.blue);
set color to the next text or shape
g.drawString(“XXXXXX”, x, y);
g.drawLine(x1,y1,x2,y2);
g.drawRect(x, y, width, height);
g.drawOval(x, y, width, height);
if width=height  circle
g.fillRect(x, y, width, height);
g.fillOval(x, y, width, height);
if width=height  circle
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x
(x,y)
width
(x1,y1)
drawRect
(x,y)
drawOval
(x2,y2)
width
(x,y)
(x,y)
fillRect
y
height
height
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fillOval
import java.applet.*;
import java.awt.*;
OR
import java.applet.Applet;
import java.awt.Graphics;
public class example extends Applet {
public void init()
{
---------------}
public void paint(Graphics g)
{
-------------------}
}
Prepared By: TA.Eman AlMoaili
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
OR
import java.applet.*;
import java.awt.*;
public class DemoTest extends Applet{
public void init()
{
this.setSize(200,240);
this.setBackground(Color.LIGHT_GRAY);
}
public void paint(Graphics g)
{
g.setColor(Color.red);
g.drawString("HELLO", 30, 30);
g.setColor(Color.blue);
g.drawLine(100, 30, 150, 30);
g.setColor(Color.orange);
g.drawRect(30, 50, 50, 30); //position(30,50) width = 50 height = 30
g.setColor(Color.green);
g.drawOval(30, 100, 50, 50); // position(30,100) width = 50 height = 50
g.setColor(Color.yellow);
g.fillRect(30, 160, 50, 50);
g.setColor(Color.magenta);
g.fillOval(100, 160, 80, 50);
}
}
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Applet with awt (Abstract Windowing Toolkit)
import
import
import
import
java.awt.Panel;
java.awt.Button;
java.awt.Label;
java.awt.TextField;
Label
TextField
Button
Panel
They are Classes !
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nameLabel
myPanel
enteredName
new GridLayout(3,2)
3 rows & 2 columns
emptyLabel
helloResult
helloBtn
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Steps to create simple applet with awt
1. Create Panel
2. Set Layout for the Panel
3. Add components (Label, TextField, Button) to
the Panel
4. Add the Panel to the applet
Prepared By: TA.Eman AlMoaili
import
import
import
import
import
import
import
import
import
import
java.applet.Applet;
java.awt.Graphics;
java.awt.Color;
java.awt.Panel;
java.awt.Button;
java.awt.Label;
java.awt.TextField;
java.awt.GridLayout;
java.awt.event.ActionListener;
java.awt.event.ActionEvent;
OR
1
2
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
3
4
How to make the Button responds to the click event?
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Status Bar
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NOTE:
When you read fromTextField, you read a String .
When you write to TextField, you write a String.
SO:
When read a number from TextField, convert it from String to number.
When write a number to TextField, convert it from number to String.
From String to Double
From String to Integer
From Double to String
int x = 10;
Stirng s = Integer.toString(x); //from Integer to String
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From String to Number:
String s = “200”;
To int
int i = Integer.parseInt(s);
To Double
Double d = Double.parseDouble(s);
Between()
From
From Number to String:
int i = 3 ;
Double d = 2.5 ;
To String
String s = Integer.toString(i);
String s = Double.toString(d) ;
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How to run applet using applet viewer?
• Open the project & the file
Select the file
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OR
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How to
WORKING WITH APPLET TAG
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<APPLET CODE=“applet class file.class”
WIDTH=“pixels”
HEIGHT=“pixels”
[CODEBASE=“directory to look for”]
[ALT=“alternate text”]
[NAME=“name of current applet instance”]
[ALIGN=“applet alignment”]
[VSPACE=“pixels”]
[HSPACE=“pixels”]>
[<PARAM NAME=“par.name” VALUE=“par.value”>
……….
……….
<PARAM NAME=“par.name” VALUE=“par.value”>]
[HTML statements]
</APPLET>
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To deal with the APPLET tag in the previous
slide, you have to add HTML file
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You need to show the Project Explorer ( NOT Package Explorer) :
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Under the project folder, you can see the src folder only.
BUT, How can you show bin folder?
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Remove the tick
Now, it is shown
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HOW to add html file to your project ?
You can add .html file to :
1- project folder.
OR
2- bin folder.
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add html file to project folder
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add html file to project folder
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add html file to project folder
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add html file to project folder
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add html file to bin folder
• Right click the bin folder, then apply the same
steps before
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add html file to bin folder
• Finally, you will get it here
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If you put the HTML file inside the project folder:
<APPLET CODE BASE=“bin” CODE=“packageName/ClassName.class” WIDTH=……
If you put the HTML file inside the bin folder :
<APPLET CODE=“packageName/ClassName.class” WIDTH= ....….
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>
>
You should write the APPLET tag inside the <body> tag
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NOTE:
If you start editing the html file, and you get
this window, click Yes.
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How to run applet from html ?
• Open the browser ( IE )
• Open the html file from the bin folder.
NOTE: If you make any changes in the applet java file:
– Save the applet java file(ctrl+s)
– Clear the web browsing storage.
Tools  Internet Options  Delete 
– Close IE
– Open IE
– Open the html
NOTE: If you make changes to html:
- Save the html file(ctrl+s)
- refresh html OR open it again.
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If you get this security warning, right click
then Allow Blocked Content
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If you use PARAM in the APPLET tag, you can
run the applet from html file not from applet
viewer in Eclipse.
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EXAMPLE
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