session 1 - introduction swing

8/3/2019 Session 1 - Introduction Swing

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Introduction to Swing

Swing Components and MVC Model

Session 1



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Introduction to Swing

Swing MVC Architecture

Container Components

Lightweight Components

Common Methods of Swing Components



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Swing is framework based on the Model-

View-Controller(MVC) architecture as

compared to AWT which was just a toolkit Swing supports a technology called

Plugable-Look-And-Feel

Java Foundation Classes (JFC)

AWT Swing Java2D



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Swing components arelightweight as comparedto AWT components

Swing components arevisually appealing, lookand feel. AWTcomponents alwaysinherit the look and feelof the native platform.



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What is MVC?

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User

Controller

Model

View



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MVC is an object-oriented user interface

design pattern first introduced in SmallTalk

somewhere in the late 1970. The code to maintain the data, its state

The code to represent graphics

The code to control user interactions The MVC Architecture has three distinct

objects



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MODEL: represents all the data and the various states of the

component

VIEW: depicts the graphical part on the screen. It takes the

data and various states from the Model to render thecomponents graphical part

CONTROLLER: responsible for determining whether the

component should react to any input events from input

devices such as keyboard or mouse. The Controller canreceive direct messages from the View, and indirect

messages from the Model



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A Container is mean to contain components.There are two types of Containers, top-level

container and general-purpose containers.



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Glass pane

Layered pane

Content pane

Menu Bar



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A Jframe is a Top-level Container used to

created a GUI-based application. It is

available in the javax.swing package. There are two ways to create Jframe

± Extending the javax.swing.Jframe

±Declaring the javax.swing.JFrame

DEMO



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An Applet is a Java program which is

meant to run as part of a web-page.

While using Swing, the javax.applet.JApplet class is used to

create an Applet.

DEMO



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The Jpanel class is both a container and a

component.Jpane component

DEMO



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The lightweight components render themselveswith pure Java code. They do not depend on

external native language code like C/C++.



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Jlabel is a component to display static text ina GUI-based application. A Jlabel can also

display an icon, or both text and icon

Constructors

Methods

± getText()

± setText(String Text)

DEMO



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A Jbutton is a rectangular component with a

text or icon as its label, and can fire an event

when cliked with a mouse. Constructors



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Methods

± setText(String text)

± getText()

Event

± mouseClicked

DEMO



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The JCheckBox component creates acomponent which can have only two states,

either checked or unchecked.

Constructors



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Methods

± isSelected()

± setSelected(boolean state)

Event

± itemStateChanged

DEMO



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The JRadioButton component creates a

component which can have only two states,

either checked or unchecked. Constructors



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Since the radio buttons are mutually

exclusive, they have to be grouped together,

else they will behave like a JCheckBox. Methods

± isSelected()

±setSelected(boolean state)

Event

± itemStateChanged

DEMO



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A JTextField component allows to input and

edit a single line of text.

Constructors



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Methods

± getText()

± setText(String text) Events

± focusGained

± focusLost

DEMO



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A JTextArea component allows to input and

edit a multiple lines of text.

Constructors



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Methods

± setText(String text)

± getText() Events

± inputMethodTextChanged

± mouseClickedDEMO



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A JPasswordField is similar a JTextField in

appearance. When the user types, the

asterisk character (*) is echoed for everycharacter typed.

DEMO



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This method is defined in the class

javax.swing.AbstractButton. Only

components which are derived from

AbstractButton class such as Jbutton,

JCheckBox and so no inherit thisfunctionality.

Syntax:

± setIcon(ImageIcon icon):



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Mnemonics allows one characer in thecomponents label to be underlined. The

component can be either clicked with a

mouse or alternately with the Alt key and the

mnemonic character combination.

Syntax:

± setMnemonic(char ch)

± setMnemonic(int number)



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A Tool Tip can be also used on a component

to comprehend additional information for

user. Syntax:

± setToolTipText(String text)



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The setBackground() method is used to set

the background color of the component

Syntax: ± setBackground(Color color)



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The setForeground() method is used to set

the foreground color of the component

Syntax: ± setForeground(Color color)



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The setFont() method is used to set the

current font of the component. It accepts a

java.awt.Font object as a parameter. Example set font for button OK



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The setVisible method is used to make acomponent either visible or invisible

Syntax:

± setVisible(boolean state)

The setEnable method is used to make a

component either enable or disable. All

components which extends from

javax.swing.Jcomponent inherit this method.

Systax:

± setEnable(boolean state)



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Handling Event

Class event : ActionEvent, ItemEvent

Interface Implements : ActionListenter, Item

Listener

Method override : actionPerformed(),

itemStateChanged()

DEMO



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Introduce to Swing MVC Architecture

Swing and AWT

Introduce to Container components

Some basic components and their

methods

session 1 - introduction swing

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