// Java AWT event handling examples
// Demonstrates WindowAdapter for window close events
// and ActionListener for button click events.
// Uses inner classes and anonymous classes to handle events
// on Frame, Button, and TextField components.
// Key concepts:
// - WindowAdapter: handles window closing event
// - ActionListener: handles button click and text field enter events
// - Inner class vs anonymous class approaches for event handlers
// - System.exit(0) to terminate the application
