content: package com.ramaguru.amrita.cys.jpl.gui.applet;
  
  /**
   * ChatApplet is a Java applet that provides a user interface for a chat application.
   * Users can enter messages in the input field and send them to the chat area.
   * This applet demonstrates a basic UI for a chat system.
   *
   * @author Ramaguru Radhakrishnan
   * @version 0.5
   *
   * This applet uses the AWT (Abstract Window Toolkit) for creating the UI components.
   * It consists of a chat area, an input field, and a send button.
   * Messages entered by the user are displayed in the chat area.
   * The input field and send button allow the user to send messages.
   *
   * Usage:
   * 1. Initialize the applet using the `init()` method.
   * 2. Enter messages in the input field and press Enter or click the Send button to send them.
   * 3. Sent messages will be displayed in the chat area.
   *
   * Example:
   * <pre>{@code
   *     <applet code="ChatApplet.class" width="500" height="400">
   *     </applet>
   * }</pre>
   *
   * Version History:
   * - 0.5: Initial version of the applet with basic UI components and message display functionality.
   *
   * Known Issues:
   * - The applet UI may not be compatible with all modern web browsers due to deprecated support for Java applets.
   * - No server-side functionality is included for handling or storing messages. This is purely a client-side UI.
   *
   * Disclaimer: This applet is provided as a sample for educational purposes and may not be suitable for production use.
   * It is recommended to use more modern web technologies for developing chat interfaces.
   */
  
  import java.applet.Applet;
  import java.awt.*;
  import java.awt.event.*;
  
  public class ChatApplet extends Applet implements ActionListener {
      private TextField inputField;
      private TextArea chatArea;
  
      /**
       * Initializes the applet by setting up the UI components.
       */
      public void init() {
          setLayout(new BorderLayout());
  
          // Create and add the chat area
          chatArea = new TextArea();
          chatArea.setEditable(false);
          add(chatArea, BorderLayout.CENTER);
  
          // Create and add the input field and send button
          inputField = new TextField();
          inputField.addActionListener(this);
          Button sendButton = new Button("Send");
          sendButton.addActionListener(this);
          Panel inputPanel = new Panel();
          inputPanel.setLayout(new BorderLayout());
          inputPanel.add(inputField, BorderLayout.CENTER);
          inputPanel.add(sendButton, BorderLayout.EAST);
          add(inputPanel, BorderLayout.SOUTH);
      }
  
      /**
       * Handles the action performed event for the input field and send button.
       * If the input field is used, the message is retrieved and displayed in the chat area.
       * @param e The ActionEvent object representing the event.
       */
      public void actionPerformed(ActionEvent e) {
          if (e.getSource() == inputField) {
              String message = inputField.getText();
              displayMessage("User: " + message);
              // Here you can perform any necessary logic to send the message to the chat server or process it as needed
              inputField.setText("");
          }
      }
  
      /**
       * Displays a message in the chat area.
       * @param message The message to be displayed.
       */
      private void displayMessage(String message) {
          chatArea.append(message + "\n");
      }
  }
  