Event Handling Patterns

Event handling is where UI architectures usually become tangled. Once callbacks start mutating shared state across multiple components, the code stops reading like an interface and starts reading like a hidden workflow engine.

These pages focus on propagation, command encapsulation, and coordination patterns that keep Java UI event flows understandable.

In this section

• Event Bubbling and Capturing in Java UI Frameworks
  Understand how events propagate through Java UI component trees so handlers run at the right level and in the right order.
• Command Pattern in Java UI Applications
  Encapsulate Java UI actions as commands so menus, buttons, shortcuts, and undo flows can share the same behavior.
• Mediator Pattern for Event Management in Java
  Centralize coordination between Java UI components when direct listener-to-listener wiring becomes too tangled to maintain.