COLOR
PALETTE USING JAVA
AIM:
To
write the java program to create applets incorporating the following
features:
ALGORITHM:
(1) Step 1: Import all
necessary packages and classes.
(2) Step 2: Define a class
CPalette that extends Applet and implements the interfaces ActionListener and
ItemListener.
(3) Step 3: Define the
objects for the controls such as Button, CheckboxGroup, Checkbox and
TextArea.
(4) Step 4: Add all the
controls by using the init() method of Applet class.
(5) Step 5: Arrange all the
controls by using the method setBounds().
(6) Step 6: Set the
background color for each buttons by using the method setBackground().
(7) Step 7: Make the
controls to listen the action by using the method addActionListener().
(8) Step 8: Make the frame
visible by using the method setVisible().
(9) Step 9:If the item state
value s=1, change the background of the control TextArea.
(10 Step 10:If the item state
value s=2, change the foreground of the control TextArea.
(11 Step 11:Create the
<applet> code and save it as “ColorPalette.html”
Step
12: Run the HTML file (ColorPalette.html) in Internet Explorer.
PROGRAM:
CPalette.java
import
java.applet.*;
import
java.awt.*;
import
java.awt.event.*;
public
class CPalette extends Applet implements ActionListener,ItemListener
{
Button
b1,b2,b3,b4;
CheckboxGroup
cg;
Checkbox
c1,c2;
TextArea
ta;
int
s;
public
void init()
{
setLayout(null);
b1=new Button();
add(b1);
b1.setBounds(50,50,50,25);
b1.addActionListener(this);
b1.setBackground(Color.blue);
b2=new Button();
add(b2);
b2.setBounds(120,50,50,25);
b2.addActionListener(this);
b2.setBackground(Color.black);
b3=new Button();
add(b3);
b3.setBounds(50,95,50,25);
b3.addActionListener(this);
b3.setBackground(Color.red);
b4=new Button();
add(b4);
b4.setBounds(120,95,50,25);
b4.addActionListener(this);
b4.setBackground(Color.cyan);
cg=new CheckboxGroup();
c1=new Checkbox("Background",cg,false);
add(c1);
c1.setBounds(50,200,100,25);
c1.addItemListener(this);
c2=new Checkbox("Foreground",cg,false);
add(c2);
c2.setBounds(50,250,100,25);
c2.addItemListener(this);
ta=new TextArea();
add(ta);
ta.setBounds(150,150,120,120);
setVisible(true);
}
public
void itemStateChanged(ItemEvent ie)
{
if(c1.getState()==true)
s=1;
if(c2.getState()==true)
s=2;
}
public
void actionPerformed(ActionEvent ae)
{
if(s==1)
{
if(ae.getSource()==b1)
ta.setBackground(Color.blue);
else if(ae.getSource()==b2)
ta.setBackground(Color.black);
else if(ae.getSource()==b3)
ta.setBackground(Color.red);
else
ta.setBackground(Color.cyan);
}
if(s==2)
{
if(ae.getSource()==b1)
ta.setForeground(Color.blue);
else if(ae.getSource()==b2)
ta.setForeground(Color.black);
else if(ae.getSource()==b3)
ta.setForeground(Color.red);
else
ta.setForeground(Color.cyan);
}
}
}
ColorPalette.html
<html>
<head> <title>Color Palette Demonstration</title> </head> <body bgcolor="lightblue"> <applet code="CPalette.class" width="300" height="400"> </applet> </body> </html>
RESULT:
Thus
the java
program to create applets is written and the output is verified.
|
Tuesday, January 29, 2013
COLOR PALETTE USING JAVA
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