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Source code for above classes


package view; import java.awt.*; // to use Container.import java.awt.event.*; // to use WindowAdpater and WindowEvent. import javax.swing.*; // to use JFrame./** * A subclass of AFrame containing two JButtons that have event handler called* "commands" to dynamically switch layout managers when the buttons are clicked * upon.* @author D.X. Nguyen */public class Frame2 extends AFrame { public Frame2(String title) {super(title); }protected void initialize() { Container cp = getContentPane();cp.setLayout(new FlowLayout());JButton jb1 = new JButton("Grid Layout"); JButton jb2 = new JButton("Flow Layout");cp.add(jb1); cp.add(jb2);pack(); /*** Registers an anonymous event handler for the clicking of button jb1. * When jb1 is clicked upon, this event handler will respond by* executing its actionPerformed(...) method. */jb1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) {jb1Clicked(e); }}); /*** Same as the above. */jb2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) {jb2Clicked(e); }}); }/** * Dynamically changes to a GridLayout with 2 rows and 1 column.*/ protected void jb1Clicked(ActionEvent e) {System.out.println("Set GridLayout..."); getContentPane().setLayout(new GridLayout(2,1));validate(); // forces this frame to re-layout. }/** * Dynamically changes to FlowLayout.*/ protected void jb2Clicked(ActionEvent e) {System.out.println("Set FlowLayout..."); getContentPane().setLayout(new FlowLayout());validate(); // forces this frame to re-layout. }}


package app; import javax.swing.*;import view.*; public class Frame2App {public static void main(String[] args) {JFrame f = new Frame2("A JFrame with 2 JButtons with event listeners"); f.setVisible(true);f.setSize(300, 100); // Guess what this does! f.setLocation(200, 200); // Guess what this does!// Forces the frame to re-layout its components: f.validate();} }


package view; import java.awt.*;import java.awt.event.*; import javax.swing.*;/** * Same functionality as Frame2 but uses an adapter interface to communicate* with the outside world instead. This design allows varying the communication * with the outside world. How the outside world reacts to the events that* happen to the view is a variant behavior! * Uses the Null-Object Pattern to initialize the adapter avoiding checking for* null. * @author DXN*/ public class Frame3 extends Frame2 {// Initializes the adapter to a null object: private IView2World _v2wAdapter = new IView2World() {public Object button1Clicked (ActionEvent e) { return null; // does nothing!} public Object button2Clicked (ActionEvent e) {return null; // does nothing! }}; public Frame3(String title) {super(title); }public void setV2WAdapter(IView2World v2w) { if (null == v2w) {throw new IllegalArgumentException("Argument cannot be null!"); }_v2wAdapter = v2w; }/** * Tells _v2wAdapter the button click event happens on jb1.*/ protected void jb1Clicked(ActionEvent e) {_v2wAdapter.button1Clicked(e); }/** * Tells _v2wAdapter the button click event happens on jb2.*/ protected void jb2Clicked(ActionEvent e) {_v2wAdapter.button2Clicked(e); }}


package view; import java.awt.event.*;/** * Adapter connecting Frame3 (the View) to the outside world.*/ public interface IView2World {/** * Called by Frame3 when its button 1 is clicked.*/ public Object button1Clicked (ActionEvent e);/** * Called by Frame3 when its button 2 is clicked.*/ public Object button2Clicked (ActionEvent e);}


package controller; import view.*;import java.awt.event.*; import javax.swing.JFrame;import java.awt.*; // For layout managers. /*** The controller that instantiates a concrete IView2World object and connects * the world outside of Frame3 (the view) to Frame3.* The concrete adapter is implemented as an anonymous inner classe. */public class Frame3Controller { public JFrame constructFrame() {// Local variable needs to be final so that the local inner class // can access it:final Frame3 frame = new Frame3("View and Controller"); /*** Install as concrete anonymous IView2World adapter in frame, without * frame knowing what the adapter does.*/ frame.setV2WAdapter(new IView2World() {public Object button1Clicked (ActionEvent e) { frame.getContentPane().setLayout(new GridLayout(2,1));frame.validate(); return null;} public Object button2Clicked (ActionEvent e) {frame.getContentPane().setLayout(new FlowLayout()); frame.validate();return null; }}); frame.setVisible(true);return frame; }}


package app; import view.*;import controller.*; /*** Instantiates the controller and builds the frame! */public class Frame3App { public static void main(String[]args) { new Frame3Controller().constructFrame().validate();} }

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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Source:  OpenStax, Principles of object-oriented programming. OpenStax CNX. May 10, 2013 Download for free at http://legacy.cnx.org/content/col10213/1.37
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