Swing is a GUI widget toolkit for Java that improves upon the AWT. It includes powerful and flexible components like JFrame, JPanel, buttons, labels and other widgets. Components in Swing are lightweight and inherit from the JComponent class. Swing uses layout managers to organize components and also includes dialog boxes for user input and messages. The document provides examples of creating simple Swing applications with labels, buttons, and drawing to the screen.

1. Introducing Swing(modern Java GUI)

2. Introduction
• Swing is a set of classes that provides more powerful
and flexible GUI components than does the AWT.
• Swing program, including both applications and applets.
• Swing has:
– Component: derived from the JComponent class
– Container: two types of container:
• The first are top-level containers: JFrame, JApplet, JWindow, and
Jdialog : not inherit JComponent. Do, however, inherit the AWT classes
Component and Container.
• Lightweight containers do inherit Jcomponent: Jpanel,

3. Component

4. Layout Manager
• Flow Layout
• Grid Layout
• Border Layout
• Card Layout

5. DIALOG BOXES
• message dialog box,
• coni rmation dialog box, and
• input dialog box.

6. import javax.swing.*;
public class TestSwing1{
public static void main(String[] args)
{
int age;
String name;
name=JOptionPane.showInputDialog("Enter your name:");
age=Integer.parseInt(JOptionPane.showInputDialog("Enter your age:"));
JOptionPane.showMessageDialog(null,"Your name is :" + name + "nr Your
age is " + age);
}
}

7. Your first
import javax.swing.*;
class TestSwing1 {
TestSwing1() {
// Create a new JFrame container.
JFrame jfrm = new JFrame("First Swing step");
// Give the frame an initial size.
jfrm.setSize(275, 100);
// Terminate the program when the user closes the application.
jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create a text-based label.
JLabel jlab = new JLabel(" Swing means powerful GUIs.");
//Add the label to the content pane.
jfrm.add(jlab);
//Display the frame.
jfrm.setVisible(true);
}
public static void main(String args[]) {
new TestSwing1();
}
}
import javax.swing.*;
import java.awt.*;
class TestSwing1 extends JFrame {
JLabel jlab ;
TestSwing1() {
// Create a new JFrame container.
super ("First Swing step");
// Give the frame an initial size.
setSize(275, 100);
// Terminate the program when the user closes the application.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create a text-based label.
jlab=new JLabel();
Font font = new Font("Limon S1", Font.BOLD, 30);
jlab.setFont(font);
jlab.setText("sYsþIBiPBelakd¾QWcab;");
//Add the label to the content pane.
add(jlab);
//Display the frame.
setVisible(true);
}
public static void main(String args[]) {
new TestSwing1();
}
}

8. import java.awt.*;
import javax.swing.*;
import java.util.*;
public class TestSwing1 extends JFrame
{
public TestSwing1(int width, int height)
{
super("Alphabet + Numeric");
setLayout(new GridLayout(6,5));
setBounds(0, 0, width, height);
for(int i=0;i<26;i++)
{
Character alphabet =(char)(i + 'A');
JButton button =new JButton(alphabet.toString());
add(button);
}
for(int i=0;i<10;i++)
{
JButton buttonNum=new JButton(i + "");
add(buttonNum);
}}
public static void main(String[] args)
{
JFrame frame =new TestSwing1 (300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}}

9. import java.awt.GridLayout;
GridLayout fl = new GridLayout(4,2);
windowContent.setLayout(fl);

13. import javax.swing.*;
import java.awt.*;
public class TestSwing1 extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g); // Call the paintComponent method of the parent
g.setColor (Color.BLACK); // Use black for drawing in the panel
Font font = new Font("Limon S1", Font.BOLD, 80);
g.setFont (font); // Uses the Flat Brush font when drawing a String
setBackground(Color.GRAY) ;
g.drawString ("sYsþI kMuBüÚT½r)ak;kaNUt", 50, 50);
}
public static void main(String [ ] args)
{
JFrame frame = new JFrame("<---------->");
frame.setBounds(0, 0, 600, 200);
TestSwing1 ts = new TestSwing1();
frame.add(ts);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

14. Event Handling