What is JApplet in Swing?

• JApplet:

  • JApplet is a class in javax.swing that represents swing applet.

  • An applet is a small program which runs in the web browser.

  • To create a Swing applet developers often extend the JApplet class.

Life Cycle methods:

There are 4 methods to represent the life cycle of the JApplet and they are:

1. intit(): it is called only once when the applet is created.

2. start(): it is called whenever the applet becomes not visible or starts after being paused.

3. stop(): it is called whenever the applet becomes not visible or when the applet is paused.

4. destroy(): it is called when the applet is about to be unloaded.

Swing components in applets:

• Like JFrame, JApplet can include various Swing components like buttons, labels and panels.

• To add swing components to JApplet we can follow the same principles which we followed to use JFrame.

Displaying in a web browser:

• To display JApplet in a web browser we can use <applet> tag embedded with the .class file in HTML

Layout managers:

Layout managers like flow layout, border layout and others can be used to arrange components within the applet.

Event Handling:

Event handling in swing applets is done using Listeners to capture user interactions.

Program:

•   // Java program to demonstrate using JApplet.
  
    import javax.swing.JApplet;
    import javax.swing.JButton;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
  
    class MyApplet extends JApplet {
        public void init() {
        JButton button = new JButton("Click me");
        button.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e) {
                System.out.println("Button Clicked");
            }
        });
        add(button);
        }
        public void start(){}
        public void stop(){}
        public void destroy(){}
    }