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15. Swing

Swing is a set of classes that provides more powerful and flexible components than are possible with the AWT. In addition to buttons, check boxes and labels, Swing supplies severals components including tabbed panes, scroll panes, trees, picture buttons, combo box , etc.
Unlike AWT components, Swing components are platform independent since they are written in Java. They are called as lightweight components. Swing related classes are contained in javax.swing and its subpackages.

JApplet

Applets that use Swing must be subclasses of JApplet, which extends Applet. JApplet is rich in functionality than Applets and provides various panes such as content pane, glass pane and root pane. To add a component, obtain the pane then call add( ) method for the pane of the JApplet.
Container getContentPane( ) to obtain the content pane

void add(comp) to add a component in content pane


Comp

label

Constructor

JLabel(Icon I)
JLabel(String s)
JLable(String s, Icon I, int align)

Methods

Icon getIcon( )
String getText( )
void setIcon(Icon I)
void setText(String s

Comp

Text Field



Constructor

JTextField( )
JTextField(int cols)
JTextField(String s)
JTextField(String s, int cols)

Methods

.........................

Comp

Buttons


Constructor

JButton(Icon i)
JButton(String s)
JButton(String s, Icon I)


Methods

................................

Comp

CheckBox


Constructor

JCheckBox(Icon I)
JCheckBox(String s)
JCheckBox(Icon I, boolean)
JChcekBox(String s, boolean)
JCheckBox(String s, Icon I, boolean)


Methods

...........................

Comp

Radio Buttons

Constructor

JRadioButton(Icon I)
JRadioButton(String s)
JRadioButton(String s, boolean)
JRadioButton(s, I, boolean)



Methods
.........................................

Comp

Combo Box

Constructor

JComboBox( )
JComboBox(Vector v)

Methods

..............................

Comp

Tabbed Panes



Constructor

JTabbedPane( )

Methods


addTab(title, comp)

Comp

Scroll Panes

Constructor

JScrollPane(comp)
JScrollPane(int vsb, int hsb)
JScrollPane(comp, vsb, hsb)

Methods
.......................................

Comp

Trees

Constructor

JTree(HashTable h)
JTree(Object ob[])
JTree(TreeNode t)
JTree(Vector v)

Methods
...........................................

Comp

Tables

Constructor

JTable(Obect data[][], Object colheads[])

Methods

...............................

Icons

Method

Int getIconHeight( )

int getIconWidth( )

void paintIcon(comp, Graphics, x, y)

void setDisabledIcon(icon)

void setPressedIcon(icon)

void setSelectedIcon(icon)

void setRolloverIcon(icon) Scroll Panes

JScrollPane(comp, vsb, hsb)

The vsb, hsb constants are

ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS

ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED

ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS

ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED

Example :

import javax.swsing.*;
import java.awt.*;
public class Jlabel extends JApplet
{
public void init( )
{
Container cp = getContentPane( );
ImageIcon ii = new ImageIcon("Birds");
JLabel jl = new JLabel("Birds",ii,JLabel.Center);
Cp.add(jl);
}
}
Example :
import javax.swing.*;
import java.awt.*;
public class jscroll extends JApplet
{
public void init( )
{
Container CP = getContentPane( );
Jpanel jp = new Jpanel( );
jp.setLayout(new GridLayout(20,20));
int b = 0;
for(int ii = 0; I<20; I++)
{
for(k=0;k<20;k++)
{
jp.add(new JButton("Button " + b));
b++;
}
}
int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED
int h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;JScrollPane jsp = new JscrolPane(jp, v, h) ;
CP.add(jsp, BorderLayout.CENTER);
}
}

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