Advertisement :
   Log In    OR    Register  
  Topics :  
RMI Example

Home >>> Coding Tips on Java >>> Decorator Java >>> Decorator Design
Struts Tutorials:
Struts2 Tag CheckBoxList
, Checkbox, Iterator, IF
Struts2 Tag Library Example Struts2 Tiles Example Struts2 Tiles I18N Example Struts2 Questions Struts Tiles I18N Example Struts Eclipse MVC Struts2 Tags Struts2 Example and Tutorial Struts MVC Struts2 Validation
Hibernate Tutorials: Hibernate Case Study Class Hierarchy Persist Example Using Hibernate Interceptor Hibernate Questions with Answer Hibernate Many-to-Many Mapping Example Hibernate one-to-many Mapping Example Hibernate and ORM tools Spring Hibernate Example Hibernate SessionFactory Example Hibernate Mapping Class Hierarchy Hibernate Questions Hibernate SessionFactory Questions Spring Hibernate Example: Spring Hibernate Case Study

Written By : Amit
Title :
Event handling and Java Technology
Description : Event handling and Java Technology
More...


Written By : admin
Title :
Using Final Keyword
Description : Example on using Final Keyword in Java code
More...


Written By : Amit
Title :
In memory AWT Image Creation
Description : Java Code
More...


Written By : Amit
Title :
Java Integral Types
Description : Java Types with Bit size
More...


Written By : Amit
Title :
Search Class in JAR
Description : Using Java Technology
More...


Written By : Amit
Title :
Move component on Java Applet
Description : Drag and Drop
More...


Written By : Amit
Title :
ArrayBlockingQueue and Queue
Description : Using Java Technology
More...


Written By : Amit
Title :
Auto generation of code using Java
Description : Castor XSD
More...

Tags/Keywords : Decorator Java, Decorator Design, Java Platform
Author : Amit
Date (Year/Month/Date): 2009-06-14 Decorator design Patern on Java Platform
Decorator design pattern using Java Platform

While designing User interface using Java AWT or Swings components,
Usually developer requires some more controls with features other than
the existing set of components provided by Java in its rich set of APIs.

Using Decorator pattern one can create/modify existing Look and feel of
UI component, such as JButton that is present in Java API.

Suppose I have to use a button which has a crossed red line over it,
across its two opposite corners.

I can use decorator design patterns to create a similar button as desired.

One way is to override paint method from JComponent/Component and provide
some additional graphical touch to the look and feel of this component.

Here is an example that tries to place an inclined red line across 
a JButton, as shown below in this Image:

CustomJFrame is the main client to run with and the CustomJButon.java, 
draws the desired button from scratch.

the source code is self explanatory, the CustoJButton takes the JButton
object in its construtor and adds an inclined red line to its Graphics 
context.

Advertisement :
Similarly we can add images on to Buttons as we might have seen in some advanced thick clients. CustomJButton.java

/**
 * This code is provided "AS IS" without any guarantee
 * or waranty of any kind.
 * Use of this code allowed only for educational and learning
 * purpose. Commercial use of this code is strictly prohibited.
 * You cann't publish this code or this writeup in any other site.
 * Author: Amit
 * Contact : usingframeworks@gmail.com
 * Date: 14-June-2009
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class CustomJButton extends JButton
{
   public CustomJButton(String name) {
	   super(name);
   }

   public void paint(Graphics g) {
      super.paint(g);
      int height = this.getHeight();
      int width = this.getWidth();
      g.setColor(Color.red);
      g.setFont(new Font("",Font.BOLD,2));
      g.drawLine(0, 0, width, height);

   }
}
CustomJFrame.java

/**
 * This code is provided "AS IS" without any guarantee
 * or waranty of any kind.
 * Use of this code allowed only for educational and learning
 * purpose. Commercial use of this code is strictly prohibited.
 * You cann't publish this code or this writeup in any other site.
 * Author: Amit
 * Contact : usingframeworks@gmail.com
 * Date: 14-June-2009
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class CustomJFrame extends JFrame
{
	public CustomJFrame()
	{
		setSize(150,70);
		getContentPane().setLayout(new FlowLayout());
		getContentPane().add(new CustomJButton("Save"));
		show();
		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent we) {
				System.exit(0);
			}

		});
	}
	public static void main(String args[])
	{
		new CustomJFrame();
	}
}
Similarly in case of AWT based screen we can decorate existing AWT button with an inclined red line across the button as shown in image below: Source code for this example is very simple, I just removed Swings related API from these class files and added AWT related API as shown below: CustomButton.java

/**
 * This code is provided "AS IS" without any guarantee
 * or waranty of any kind.
 * Use of this code allowed only for educational and learning
 * purpose. Commercial use of this code is strictly prohibited.
 * You cann't publish this code or this writeup in any other site.
 * Author: Amit
 * Contact : usingframeworks@gmail.com
 * Date: 14-June-2009
 */

import java.awt.*;
import java.awt.event.*;

public class CustomAWTButton extends Button
{
   public CustomAWTButton(String name) {
	   super(name);
   }

   public void paint(Graphics g) {
      super.paint(g);
      int height = this.getHeight();
      int width = this.getWidth();
      g.setColor(Color.red);
      g.setFont(new Font("",Font.BOLD,2));
      g.drawLine(0, 0, width, height);

   }
}
CustomFrame.java

/**
 * This code is provided "AS IS" without any guarantee
 * or waranty of any kind.
 * Use of this code allowed only for educational and learning
 * purpose. Commercial use of this code is strictly prohibited.
 * You cann't publish this code or this writeup in any other site.
 * Author: Amit
 * Contact : usingframeworks@gmail.com
 * Date: 14-June-2009
 */

import java.awt.*;
import java.awt.event.*;
public class CustomFrame extends Frame
{
	public CustomFrame()
	{
		setSize(150,70);
		setLayout(new FlowLayout());
		add(new CustomAWTButton("Save"));
		show();
		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent we) {
				System.exit(0);
			}

		});
	}
	public static void main(String args[])
	{
		new CustomFrame();
	}
}
One can try experiment on these example to come up with some interesting UI related designs on Java Platform and submit those ideas here in this Page (if interested).
Advertisement :
Author of this article/writeup has expressed his/her willingness
to help or guide users with any technical difficulties he/she faces while working with the example code environment setting up, running and resolving any such exception raised during compile or at runtime. You may ask for any technical doubt or seek technical help related to this article by using following form to reach for technical help from the Author for FREE. This article's Author shall be reading your request and responding within reasonable time (no resolution timeframe defined as such).


	
Are you interested in solving a very interesting Technology Stack while Playing this Game          

Please write your Comment on this Matter
(This will be visible if found suitable):
Name: *
Email (will not be displayed): *
Matter: *
38,31
Enter bigger number from above :*
Home >>> Coding Tips on Java >>> Decorator Java >>> Decorator Design
Visitor/User referred related external URL:
(Visible upon review and approved by this site Administrator)
Referred By Name *:
Resource URL *: (e.g, URL should be starting with http://www.-----.---)
 
Resource Short Description *:
39,13
Enter bigger number from above : *

Please log in to add or reply to any matter<- requires login
Log in or Register
Copyright © 2008-2009, Interview-Questions-Tips-Forum, All Rights Reserved.
CONTACT    PRIVACY POLICY    DISCLAIMER
Terms of Use and Disclaimer :

This web site provides some of the information about various technologies, example 
code, tips, tutorials etc. Like any printed materials, content of these pages may 
become out of date over a period of time. Therefore all visitor/users of this web 
site are requested/advised to refer to the originating parties/sources for the 
latest changes and happenings for detailed information. This information is not 
intended to be a substitute for the original reference provided by the originating 
parties/sources.

By accessing and using this website in any ways, including, without
limitation, browsing the website pages, using any information, using any content and/or 
downloading any materials, you agree to and are bound by the terms of use 
described in this page and Usage Terms and Conditions. 
If you do not agree to all of 
the terms and conditions contained in the terms of use described in this
page and Usage Terms and Conditions, do not use this 
website in any manner. If you are using the website on behalf of your 
employer, you represent that you are authorized to accept these Terms of Use 
on your employer's behalf.

All Trademarks are property of their respective owner. Appropriate measure is being
taken for providing accurate and up-to-date information but like any printed materials,
these blog(s)/contents may eventually be outdated one day, so if you are using any 
of these information, please refer original content/documentation from respective sources. 
And under no circumstances shall the Author of these contents and/or this web site
be liable for any loss, damage, expense incurred or suffered which is claimed to have
occurred because of usage of the contents of this web site.
If you have any questions/queries/feedback/suggestions then please write to this web
site owner at contact.