Advance Java Technology

Java’s Role::MVC Architecture :: Swing

Prof.Chintan Dave

Who is the Founder of Java???????

Which is the Most Popular Machine Used in Day to Day Life Uses Java????????

Which is the Most Popular OS Uses Java as Prime Framework ???

Most Popular Companies uses Java as Prime Technology…

GoogleYahooMicrosoftLinkedIn……………..endless list

Usage wise Programming Languages/Technologies

Common Architecture for Any Programming Technology

Operating System

Run Time Environment

Class Libraries

Application

Java Architecture

Operating System- Windows,Mac,Solaris…

Run Time Environment-JVM

Class Libraries-Packages

Application-Windows ,Web , Mobile …….

How Application Can be Developed

- Traditional Way of Developing an Application with Forms…Approach

-Developing an Application with MVC Architecture

None is Best None is Worst Too--- Its Just on Requirements… or Approach for an Application

MVC Architecture

a software design pattern for developing web applications.

Model - The lowest level of the pattern which is responsible for maintaining data.

View - This is responsible for displaying all or a portion of the data to the user.Controller - Software Code that controls the interactions between the Model and View.

What is Swing????

It is a SET of Programs which provides facility to Create GUI.

It is a Widget Toolkit It is Part of JFC(Java Foundation Classes It is Useful for Creating Rich Set of Desktop

Application

IT MEANS it’s a PURE JAVA

What You Need to Run Java- SWING

• JAVA SE- which can be downloaded from java.sun.com/javase

To Make Java Code You’ll Need an Editor….Most Popular Once are…..

• Notepad• Eclipse• Net beans• JCreator

Pluggable Look n Fell

Pluggable L&F (PLAF) is basically a "skin" system for Swing components - you can change the style of your application by changing its LAF

Allows an Application Development to Highly Interactive GUI Component and Effects with ready made set of APIs

Applet Vs Swing

Swing Applet

Swing have its own Layout like most popular Box Layout.

Applet uses AWT Layouts like flowlayout.

Swing is light weight Component.

iTS Heavy Weight

Swing uses for stand lone Applications, Swing have main method to execute the program

Applet need HTML code for Run the Applet

Swing Uses MVC Applet Does not

Swing Features

• Lightweight - Swing component are independent of native Operating System's API as Swing API controls are rendered mostly using pure JAVA code instead of underlying operating system calls.

• Rich controls - Swing provides a rich set of advanced controls like Tree, Tabbed Pane, slider, color picker, table controls

• Highly Customizable - Swing controls can be customized in very easy way as visual appearance is independent of internal representation.

To Use Swing Components..• Create an Object of Component For Example: JButton but = new JButton();

• Adding Component For Example:

Container cp = getContentPane();

cp.add(new JButton(“but”)); • Laying Out Component Not so difficult but takes a little practice JPanel p1 = new JPanel(); p1.setLayout(new FlowLayout(FlowLayout.LEFT));

Simple Swing Exampleimport javax.swing.*; public class Simple { JFrame f; Simple(){ f=new JFrame(); JButton b=new JButton("click"); b.setBounds(130,100,100, 40); f.add(b); f.setSize(400,500); f.setLayout(null); f.setVisible(true);

} public static void main(String[] args) { new Simple(); } }

JLabel

The class JLabel can display either text, an image, or bothExample code:

import javax.swing.*;

class hello {public static void main(String[] args){

JFrame f = new JFrame(“title”);JPanel p = new JPanel();JLabel b = new JLabel(“Demo Label”);p.add(b); // add labelto panelf.setContentPane(p); // add panel to framef.show();

}}

JButtonThe class JButton is an implementation of a push button. It can have Image also

Code - JButtonimport javax.swing.*;public class SimpleButton {JFrame f; SimpleButton(){f=new JFrame("Simple Button

Example");

ImageIcon india = new ImageIcon("india.jpg");

JButton jb = new JButton("Our Flag",india);

JButton b=new JButton("click");f.add(b);f.add(jb);b.setBounds(130,100,100, 40);jb.setBounds(130,200,500,200);

f.setSize(400,500);f.setLayout(null);f.setVisible(true);f.setDefaultCloseOperation(JF

rame.EXIT_ON_CLOSE);}public static void

main(String[] args){new SimpleButton();}}

JTextfieldThe class JTextField is a component which allows the editing of a

single line of text.Common Constructors:-• JTextField(String text):- Constructs a new TextField initialized with the specified text.

Code - JTextFieldimport java.awt.*;import java.awt.event.*;import javax.swing.*;//code that demonstrate use of

JLabel,JButton,JTextfield and Sample GUI Application

public class SimpleTextField {JFrame f; SimpleTextField(){ //Setting Layout f=new JFrame("Simple Button

Example"); JPanel controlPanel = new

JPanel(); controlPanel.setLayout(new

FlowLayout());

//Creating GUI Aspects for an Appllication JLabel lblUsername= new JLabel("Username:", JLabel.RIGHT); JLabel lblPassword = new JLabel("Password:", JLabel.CENTER); JTextField txtUsername = new JTextField(10); JTextField txtPassword = new JTextField(10); JButton btnLogin=new JButton("Login");

Code – JTextField-Continue//Adding Instance in Layout

controlPanel.add(lblUsername);

controlPanel.add(txtUsername);

controlPanel.add(lblPassword);

controlPanel.add(txtPassword);

controlPanel.add(btnLogin); f.add(controlPanel); f.setSize(400,500); f.setVisible(true);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}public static void main(String[] args){new SimpleTextField(); //calling GUI

} }

Event Handling

• What is an Event? Change in the state of an object is known as event.• Types of Event• The events can be broadly classified into two

categories:• Foreground Events - Those events which require

the direct interaction of user.• Background Events - Those events that require the

interaction of end user are known as background events. Operating system interrupts

Code for Simple Even Handling import java.awt.*;import java.awt.event.*;import javax.swing.*;//code that demonstrate use of

JLabel,JButton,JTextfield and Sample GUI Application

public class SimpleButtonEvent {JFrame f; JLabel statusLabel=new JLabel("Your Status");

SimpleButtonEvent(){ //Setting Layout f=new JFrame("Simple Button Example"); JPanel controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout());

//Creating GUI Aspects for an Appllication JButton btnOk=new JButton("Ok"); JButton btnCancle=new JButton("Cancle"); JButton btnRetry=new JButton("Retry");

//Adding Instance in Layout controlPanel.add(btnOk); controlPanel.add(btnCancle); controlPanel.add(btnRetry);btnOk.addActionListener(new

ButtonClickListener()); btnCancle.addActionListener(new

ButtonClickListener()); btnRetry.addActionListener(new

ButtonClickListener());

controlPanel.add(statusLabel); f.add(controlPanel); f.setSize(400,500); f.setVisible(true);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

Code for Simple Even Handling private class ButtonClickListener implements

ActionListener{ public void actionPerformed(ActionEvent e)

{

String command = e.getActionCommand(); if( command.equals("Ok")) { statusLabel.setText("Ok Button clicked."); } else if( command.equals("Cancle") ) { statusLabel.setText("Cancle Button

clicked."); } else { statusLabel.setText("Retry Button

clicked."); } }}

public static void main(String[] args){ new SimpleButtonEvent(); //calling GUI

} }

JCheckBox• The class JCheckBox is an implementation of a check box - an item that can be selected or

deselected, and which displays its state to the user.

• Constructor- JCheckBox(String text): Creates an initially unselected check box with text.

• Method- getStateChange() – A Boolean Method to get the state of CheckBox

• Event- Listener Is – ItemListener Event is - ItemEvent

Code for Simple Checkboximport java.awt.*;import java.awt.event.*;import javax.swing.*;//code that demonstrate use of JLabel,JButton,JTextfield and

Sample GUI Application

public class SimpleCheckBox {JFrame f; SimpleCheckBox(){ //Setting Layout f=new JFrame("Simple CheckBox Example"); JPanel controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout());

//Creating GUI Aspects for an Appllication JCheckBox chkApple = new JCheckBox("Apple"); JCheckBox chkMango = new JCheckBox("Mango"); JCheckBox chkBanana = new JCheckBox("Banana");

//Adding Instance in Layout controlPanel.add(chkApple); controlPanel.add(chkMango); controlPanel.add(chkBanana);

chkApple.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { f.setTitle("Apple Checkbox: " +

(e.getStateChange()==1?"checked":"unchecked")); } }); f.add(controlPanel); f.setSize(400,500); f.setVisible(true); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}

public static void main(String[] args){new SimpleCheckBox(); //calling GUI

} }

JRadioButton

• Same as Checkbox But……Usage…is Different as per GUI’s Needs

JList

• The class JList is a component which displays a list of objects and allows the user to select one or more item

• Constructor:- JList()- Constructs a JList with an empty, read-only, model.

• Method:- addElement(String) – To add an Element in a List setSelectionMode()- selection mode for the list

Code for Simple Listimport java.awt.*;import java.awt.event.*;import javax.swing.*;//code that demonstrate use of JLabel,JButton,JTextfield and

Sample GUI Application

public class SimpleCheckBox {JFrame f; SimpleCheckBox(){ //Setting Layout f=new JFrame("Simple CheckBox Example"); JPanel controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout());

//Creating GUI Aspects for an Appllication JCheckBox chkApple = new JCheckBox("Apple"); JCheckBox chkMango = new JCheckBox("Mango"); JCheckBox chkBanana = new JCheckBox("Banana");

//Adding Instance in Layout controlPanel.add(chkApple); controlPanel.add(chkMango); controlPanel.add(chkBanana);

chkApple.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { f.setTitle("Apple Checkbox: " +

(e.getStateChange()==1?"checked":"unchecked")); } }); f.add(controlPanel); f.setSize(400,500); f.setVisible(true); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}

public static void main(String[] args){new SimpleCheckBox(); //calling GUI

} }

JComboBox

• Same as Jlist but Usage is Different- Usage is As per GUI NEED